最新刊期
卷 28 ， 期 5 ， 2007
- 摘要：On the condition of electron-LO-phonon strong coupling in a parabolic quantum dot,we obtained the ground-state energy of polaron by using Pekar type variation method.The relations between the ground energy and the electron-LO-phonon coupling strength,the confinement length,the temperature were discussed.The results indicate that the ground energy of polaren in a parabolic quantum dot will decrease with increasing the electron-LO-phonon coupling strength and the confinement length and increase with increasing the temperature.关键词：quantum dot(QD);polaron;strong-coupling91|82|1更新时间：2020-08-11
- 摘要：Recently, there is much interest in the study of quantum teleportation. Its marvelous security property makes it particularly attractive as potential means for future communication. Uncertain principal and no-cloning theories of quantum mechanics forbid exact copy of quantum states. To solve the problem, quantum teleportation devides message state into two parts: classical message and quantum message which are transmitted through relevant classical and quantum channels from a sender Alice to a distant receiver Bob, respectively. According to both message states,Bob can recover the original message state with certain possibility. Utilizing the general quantum teleportation protocol, in this scheme, a new method is presented by which multi-qubit quantum information can be teleported in a much easier way. It has been extended to teleportation of an arbitrary N-qubit state via entanglement swapping and probabilistic teleportation is investigated as well, which has a more general meaning. N non-maximally entangled triplet GHZ states (Greenberger-Horne-Zeilinger), taking the place of the previous EPR states (Einstein-podolsky-Rosen),serve as quantum channels, which avoids introducing extra auxiliary qubit. In order to complete the teleportation,Alice has to devide all qubits into N parts and make Bell-State measurement on qubit pair (i,xi) and tell Bob the measurement result through classical channel, then Bob perform some simple local operations on qubits (yi,zi) to finish teleporting the i-th qubit. Conditioned on N-times similar repeat, Bob can faithfully reconstruct the initial state.Results show that, in this method, the identification difficulty of entangled states is considerably reduced, the new method is more feasible in technique. And the total possibility of successful teleportation is
. As a special case, teleportation of an arbitrary two-qubit state is proposed. 关键词：quantum teleportation;triplet GHZ state;Bell-state measurement110|82|1更新时间：2020-08-11 - 摘要：With the further,development of material production technology low dimensional electronic systems, quantum dot,quantum well and quantum wire et al,have been produced with molecular beam epitaxy technigue(MBE),metal organic chemical vapor deposition (MOCVO) and chemical self-assemble technique. Due to the small structures of quantum dot some physical properties such as optical and electron transport characteristics are quite different from those of the bulk materials,especially.The properties of the electrons in the quantum dots play a more important role in electronic and optical properties of polar crystalline materials. There has been great interest in investigation quantum dots both theoretically and experimentally.Many investigators studied the properties of the polaron in an asymmetry quantum dots in many aspects by a variety of theoretical and experimental methods.Recently,the properties of strong-and-weak-coupling pelaron in an a-symmetry quantum dot have been studied using the linear-combination operator and unitary transformation method by the present authors.However,using linear-combination operator method,the properties of the polaron in an asymmetry quantum dot has not been fully investigated so far.The purpose of this present paper is to explore the effect of the longitudinal and transverse effective confinement length of quantum dot,electron-phonon coupling strength and the cyclotron frequency of magnetic field on the properties of weak-coupling mag-netoplaron in an asymmetry quantum dots.We obtain an expression for the ground state energy and the ground state binding energy of the weak-coupling magnetopolaron in an asymmetry quantum dot as a function of the longitudinal and transverse effective confinement length,the electron-phonon coupling strength and cyclotron frequency of magnetic field by using a linear combination operator and unitary transformation method.Numerical calculations are performed and the results show that the ground state energy and ground state binding energy of the weak-coupling magnetopolaron in an asymmetry quantum dot will increase strongly with decreasing the transverse and longitudinal effective confinement length of quantum dot,and will increase with increasing the cyclotron frequency of magnetic field and decreasing the electron-phonon coupling strength.关键词：asymmetry quantum dot;magnetopolaron;linear combination operator;effective confinement length97|88|1更新时间：2020-08-11
- 摘要：With the development of the material science and experimental technology,the properties of the surface polaron in semi-infinite crystals have been of considerable interest.Many investigators studied the properties of surface polaron in semi-infinite crystals in many aspects by a variety of theoretical and experimental methods. Most polar crystals are diatomic and cubic and their crystal structure belongs to NaCl,CsCl or ZnS type. In these crystals there is one longitudinal optical (LO) phonon mode.The properties of crystals having only one LO phonon branch have been studied by a great variety of techniques.However,a large number of polar crystals,with several atoms per unit cell,have more than one LO phonon branch.For example,in cuprite compounds such as CuO2/there are two LO phonon modes.SiO2,GaAs1-xPx and a large number of perovskite’s crystals (SrTiO3,LiNbO3,BaTiO3,etc) have more than two LO phonon modes.The pelaron problem with many LO phonon branches has been studied by Matsura and Lepine.The properties of the polaron and the magneto-pelaron in a polyatomic polar crystals are investigated by the present authors.However,so far,research of the properties of surface polaron in polyatomic semi-infinite crystals considering both the electron-bulk-longitudinal optical-phonon and electron-surface-optical-phonon interaction,has been very scarce.Recently,the properties of the excited state of surface polaron in polyatomic semi-infinite,which are the strong-coupling with surface optical phonon and the bulk longitudinal optical phonon,are studied by using a linear-combination operator and unitary transformation method by the present authors. For the bulk polaron,the weak and intermediate coupling theories are applicable for electron-bulk LO phonon coupling constant αL<6,whereas for the surface polaron,this confinement is about 2.5.Hence, when the electron-SO phonon coupling constant satisfied αs>2.5,the strong-coupling theory must be applied. There is a weak coupling between the electron and the bulk LO phonon,but a strong coupling between the electron and the SO phonon for many polar crystals.So far,the research of this aspect is very scarce. The properties of the excited state of surface polaron in polyatomic semi-infinite crystal,which are the strong-coupling with surface optical phonon and the weak-coupling with bulk longitudinal optical phonon,are studied by using a linear combination operator and unitary transformation method.Results show that the ground state energy and the first internal excited state energy of surface pelaron in polyatomic semi-infinite crystal, which are the strong-coupling with surface optical phonon and the weak-coupling with bulk longitudinal optical phonon not only includes the coupling contribution between electron with different LO phonon and SO phonon branches,but also exists only an extra contribution due to crossed terms between the different SO phonon bran-ches,and the excitation energy not only includes the coupling contribution between electron and different SO phonon branches,but also exists only an extra contribution due to crossed terms between the different SO phonon branches.The excitation energy is independent of the bulk longitudinal optical phonon.关键词：polyatomic semi-infinite crystal;linear-combination operator;polaron;first internal excited state energy;excitation energy97|74|0更新时间：2020-08-11
- 摘要：Recent advances in semiconductor optoelectronics and electronics based on wide band-gap nitride materials have resulted in substantial interest in the basic properties of wurtzite crystals.Particularly,acomplete understanding of carrier-phonon interaction mechanisms and rates is essential to further progress in these fields.There are many more distinct phonon branches (nine optical and three acoustic modes) in wurtzite mate-rials.At the same time the phonon modes may not be purely longitudinal nor transverse modss.Since B.C. Lee presents a theory of electron-optical-phonon interaction in uniaxial crystals of wurtzite type based on the macroscopic dielectric continuum model and the uniaxiaal models,the special properties of superlattice and beterostructure have been investigated by many persons.However the effect of the external magnetic field on the nitride parabolic quantum well materials,to our knowledge,have rarely been investigated. In this paper,the energy level of a free polaron in a nitride infinite parabolic quantum well as function of the external magnetic field is studied using the LLp variational method.The ground state energy of polaron changing with the width of the quantum well and the external magnetic fields are obtained.Our numerical resuits for a GaN/Al0.3Ga0.7N parabolic quantum well show that the effects of the external magnetic fields on the ground state enerygy are very obvious.The energy of the polaron decrease with increasing well width and in-crease with increasing magnetic fields strength.At the same time,the contribution of the interaction between the electron and phonon to the energy of polaron in the nitride parabolic quantum well is noticeable.关键词：nitride parabolic quantum well;polaron;external magnetic field;energy104|95|0更新时间：2020-08-11
- 摘要：The influence of interaction between phonons on properties of weak-couping polaron in quantum wires are studied by using linear-combination operator and perturbation methods.The ground state energy of weak-coupling magnetopolaron in quantum wires is obtained considering the interaction between electron and LO-phonon.The influence of the confinement strength,the electron-LO phonon coupling strength and the interaction between phonons of different wave vectors in the recoil process on the ground state energy of weak-coupling magnetopolaron in quantum wires are discussed. Numerical calculation illustrated that the ground state energy of weak-coupling magnetopolaron will increase rapidly with increasing the confinement strength.At the same value of the confinement strength, ground state energy of magnetopolaron will decrease with increasing the electron-LO phonon coupling strength and will increase with increasing the cyclotron frequency of the magnetic field.For weak magnetic field,the influence of the interaction between phonons on the ground state energy of the magnetopolaron can not be ignored.关键词：quantum wire;magnetopolaron;interaction between phonons;ground state energy102|94|0更新时间：2020-08-11
- 摘要：It is taked notice that the radiation intensity related to acceptance of quantum well,and the accep-tance relates to width,deep of quantum well and beam quantity ate.The electron beam may be provided by the ion implantaion or accelerator,also may be obtained by applied biased battery on a superlattice quantum well. In the paper the characteristics of the phase plane and stabilities of the system are analysed by using phase planar analytic method in the accelerator theory.If applied biased battery on both side of the superlattice quaturn well,the particle motion equation may be redueed to the pendulum equation with a constant moment by using the sine-squared potential in the classical mechanics frame.The approximation solution and the motion period are found by Jaeobian ellipse function and the ellipse integral of the first kind.The phase planar characteristics and the stabilities of the system are analysed by a numerical method.The theoretical analyse is provided for the design of a optical bistable cell by a superlattice quantum well.关键词：quatum well;sine-squared potential;superlattice;pendulum equation111|85|5更新时间：2020-08-11
- 摘要：The development of organic electroluminescence (EL) materials has attracted much attention from academic and industrial groups due to their potential for application in full-colour flat panel displays.The dis-plays have many merits,such as low operating voltage,wide viewing angle,fast video response,and so on. The three primary colors,red,green,and blue,are essential to achieve full color displays.Although the red and green EL materials seem to have attained sufficiently high efficiencies and lifetimes for commercial applications,many challenges remain for improvement in the blue spectral region in terms of efficiency,durability in air,and spectral stability (color purity).In recent years,polytluorene and its derivatives have been exten-sively studied for blue LEDs due to their wonderful performance in organic electroluminescence,exceptionally high solubility,high photoluminescence quantum yields in the solid state,good charge transport properties and easy designing synthetic route.So they are very promising candidates for blue Organic Light-Emitting Diodes (OLEDs),and can be used as light-emitting layers,hole-transporting layers,hole buffer layers,etc.This paper reviews the development of polyfluorene and its derivatives used in OLEDs,it is divided in four parts. The first part is the background and the basic principle of organic electroluminescence.The second part intro-duces the blue,red,green,and white light-emitting polyfluorene and its derivatives,and the common synthe-sis methods including paUadium (0)-mediated Suzuki polycondensation,Ni(0)-mediated polymerization, Gilch polymerization method,Ullmann condensation,and Yamamoto polycondensation,etc.The third part reviews the development of devices based on polyfluorene and its derivatives,including doping EL devices, exciplex emitting OLEDs,and the influence of structure of EL devices on the EL performance.The last one gives a prospect of the development and application of the organic ehctroluminescence devices.关键词：organic electroluminescence;polyfluorene;derivative;device119|112|1更新时间：2020-08-11
- 摘要：Yttrium oxide is one of the scintillation material used in X-ray imaging,in order to improve the light output of doped rare earth ions,Li+ is always codoped with the luminescent center.However the mechanism for this codoping approach is still not quite clear except the common explanation of flux effect.Further research work shows the enhance effects of Li+ doping is related with concentration of Li+ and the lattice constants,but the implication of this kind of relationship is still not clear. Based on the model of cluster approximation,the influence of Li+ doped concentration on defects formation and the effect of the change of Y—O bond length on electronic density of states are studied with molecular dynamics and density functional simulation with software package (ADF2005).Since the clusters we chosen are relatively small in order to save simulation time,the results of former simulation are adopted for the cluster charge value.The value of cluster charge is further readjusted so that the cluster with least bonding energy is used for discussion,by this way we can eliminate partly the effect caused by dangling bond.Furthermore,the simulation result by cluster approximation is compared with that of the supercell methods.From these results we can draw conclusion that the methods we adopted in the simulation is reliable. The results shows that firstly the Li+ tender to occupy the interstitial position around the C2 site,which producing the stretching of the Y—O bond,thus lower the phonon energy of the sample,and increase the quantum efficiency of the material,by this way the light yield of the sample is improved. From the results of simulation,with the increase of Li+,the length of Y—O bond for C2 sites changes with the tendency of decrease-increase-decrease,which may explain the similar emission change via Li+ concentration for this type of material,thus explained the two maximum peaks in the Li+ concentration-light yield curve.The stretching of the Y—O bond may also cause the narrowing of the band gap,which might be the cause of small shift of the absorption spectrum.关键词：Li+-doping;Y2O3：Eu3+;molecular dynamics;density functional111|56|0更新时间：2020-08-11
- 摘要：The influence of melting temperature on the luminescence properties of bismuth-doped barium alu-minosilicate glasses was studied.Bismuth-doped barium aluminosilicate glasses were prepared at various melting temperatures.Absorption spectra,visible luminescence,infrared luminescence and fluorescent lifetime of the infrared luminescence of the glass samples were measured.There were two absorption peaks,one strong peak is at about 320 nm,and the other is at about 450 urn.The absorbance increased with increasing melting temperature.Visible luminescence was observed at about 420 nm,440 nm and 475 nm when excited by 380 nm ultraviolet light.The infrared luminescence was observed at about 1330 nm when excited by 808 nm laser diode (LD).The intensity of the visible luminescence decreased with increasing melting temperature,while the intensity of the infrared luminescence increased at first,and then decreased with a further increase of melting temperature.But the fluorescent lifetime of the infrared luminescence decreased at first,and then in-creased with a further increase of melting temperature.The broadband infrared luminescence originates from bismuth ions,but is not due to high valence state ion of bismuth as suggested by Fujimoto et al.We attribute the visible and infrared luminescence to Bi3+ and Bi+,respectively.The melting temperature may greatly influence the broadband infrared luminescence of bismuth-doped glasses.It is necessary to choose best melting temperature for the preparation of bismuth-doped glasses.关键词：bismuth;aluminosilicate glass;luminescence122|90|1更新时间：2020-08-11
- 摘要：Tm3+/Er3+/Yb3+ tri-doped YF3 powders were synthesized using a facile hydrothermal method. XRD analysis found that the powders were crystallized products.Their sizes and morphologies were characterized by scanning electron micrographs (SEM,Hitachi S-4800),which indicated that most of the YF3 powders were in the sizes of hundreds of nanometers.Under 980 nm excitation,we recorded the upconversion spectra at room temperature by Hitachi F-4500.From UV to IR,plenty of upconversion emissions of Tm3+ and Er3+ were observed.For Tm3+,～291 nm emissions come from 1I6→3H6,～347 nm from 1I6→3F4,～362 nm from 1D2→3H6,～452 nm from 1D2→3F4,and～475 nm from 1G4→3H6 can be identified in the upconver-sion spectra.The upconversion emissions from Er3+ are:～380 nm (4G11/2→4I15/2),～408 nm(2H9/2→4I15/2),～521 nm (2H11/2→4I15/2),～537 nm (4S3/2→4I15/2),～652 nm (4F9/2→4I15/2).Therefore,cy-an-white light were observed by naked-eye under 980 nm excitation even for a low excitation power density. With increasing of the excitation power,the emissions firstly become stronger,then weaker,at last nearly dis-appear.There are some discussions on the tempe-rature-dependent upconversion emission spectra,too.Crys-tallization became well after higher temperatures annealing,and all emissions of Tm3+ and Er3+ become relatively stronger.Upeonversion spectra depending on Tm3+ concentration indicate that at relatively low Tm3+ concentration,Tm3+-Er3+ interaction is dominant,and all Er3+ emissions become stronger for Tm3+ transfer energy to Er3+.When Tm3+ concentration reaches about 0.3%,Tm3+-Tm3+ cross relaxation is dominant, and Er3+ emission relatively become weaker.All Tm3+ emissions become relatively stronger with Tm3+ coneentration increasing.From the experimental results,we concluded that the YF3 powders should be promising materials for up-conversion white light and three-dimensional solid display.关键词：YF3 powders;upconversion;emission spectra;annealing temperature110|47|3更新时间：2020-08-11
- 摘要：Using acrylamide (CH2=CHCONH2) to form long chains of polyacrylamide and a cross-linker N′,N′-methylenebisacrylamide (CH2=CHCONHCH2NHCOCH=CH2) to achieve tangled network,hydro-gen peroxide (H2O2) as initiator and N,N,N′,N′-tetramethylethylenediamide [(CH3)2NCH2CH2N(CH3)2] as activator,we have successfully prepared the precursor from nitrates (aluminum nitrate,yttrium nitrate,and terbium nitrate),the precursor was subsequently heat-treated from 700℃ to 1 400℃ for 4 h to form terbium-doped yttrium aluminum garnet (YAG:Tb3+) phosphor powders.The synthesized powders were characterized by thermogravimertry-differential thermal analysis (TG-DTA),X-ray diffraction (XRD),scanning electron microscopy (SEM) and fluorescence spectrometer.XRD analysis demonstrated that phase-pure YAG was ob-tained directly from the precursor at 850℃,without the formation of any intermediate phase (s) of YAP (YAlO3) and/or YAM (YAl4O9).SEM images showed the particles were uniform,and the grain size in-creased with a rise in heat-treating temperature.The excitation spectrum consisted of three peaks with the highest intensity at 272 nm,the second at 230 nm and the third at 324 nm,respectively,all corresponding to the Th3+ 4f-5d absorption.5D4-7Fj(j=6,5,4,3) emissions were also observed clearly,the highest emission peaked is at 541.8 nm for the 5D4-7F5 transition of Th3+,the second is for the 5D4-7F6 with two lines at 486 nm and 490 nm,and the weaker emission from about 570 nm to 630 nm was corresponding to the transi-tions of 5D4-7F4 and 5D4-7F3.Enhanced luminescence intensity could be obtained by rising the sintering tem-perature which may improve the crystallization of YAG particles and favor the doping of Tb3+ ions into YAG lattices.Concentration quenching phenomenon appeared when Tb3+ molefraction (value of x) in (Y1-xTbx)3Al5O12 is over 0.06.关键词：polyacrylamide gel;Y3Al5O12：Tb3+;luminescence;concentration quenching103|72|0更新时间：2020-08-11
- 摘要：Red phosphor LiEu (SiO2)1/6W2O8 particles were prepared by ultrasonic spray pyrolysis.The effects of firing temperature,concentration of precursor solution and flow rate of carrier gas on phosphor relative emission intensity were studied.The morphology and luminescence characteristics of the particles were investigated by scanning electron microscope (SEM),X-ray diffraction,excitation spectra and emission spectra respectively.The particles were like spherical shape,around 1.5μm in diameter and with narrow size distribution.Aggregation between particles was not observed.Spray pyrolysis makes Eu3+ well distributed in the crystal lattice as the luminescent centers.The phosphor LiEu(SiO2)1/6W2O8 particles prepared by spray pyrolysis have higher emission intensity than that by solid state reaction.The main excitation peak of the particles is near 396 nm.The main peak of the emission spectra under 396 nm light excitation is a transition 5D0→7F2 of Eu3+ at 615 nm,while other emission peaks are transitions 5D0→7F1,5D0→7F3 and 5D0→7F4 of Eu3+ at 592 nm,655 nm,702 nm respectively.The intensity of other emission peaks is weak,which is advantageous to obtain the good CIE chromaticity coordinates.The CIE chromaticity coordinates are calculated to be x=0.6679, y=0.3310 for the emission of LiEu(SiO2)1/6W2O8.The particles may be used for white-LED excitated by ultraviolet chip.Compared with traditional solid state reaction,spray pyrolysis have many advantages.For example,pure phase particles are achieved,flux and milling are not needed and phosphor prepared by spray pyrolysis can be produced continuously etc.Luminescent materials prepared by spray pyrolysis have become focus of research in recent years.Yet red phosphor LiEuSi1/6W2O8 particles prepared by spray pyrolysis have never been reported.关键词：spray pyrolysis;phosphor;LiEu(SiO2)1/6W2O8;white-LED101|59|4更新时间：2020-08-11
- 摘要：The study of the temperature dependence of photofluorescence in self-assembled quantum dots (QDs) is essentially important for the realization of room temperature efficient photoelectronic devices.The temperature dependence of photofluorescence of serf-assembled QDs will be directly determined by the carrier dynamics process in self-assembled QDs.As the temperature increases,the carrier will be thermal excited into the wetting layer from the ground states of an ensemble of QDs with difference sizes and then some of them will be recaptured by other QDs,i.e.thermal carrier transfer will take place between the ensemble of QDs with difference sizes when the temperature increases. In this paper,the temperature dependence of the photofluorescence of self-assembled QDs was simulated by using a steady-state rate equation model which takes into account the carrier thermally transfer effect in self-assembled quantum dots.The temperature dependence of photofluorescenee intensity of three QDs groups with different ground state energy was emphatically investigated.The results show that,with the temperature in-creasing,the photofluorescence intensity of QDs with lower ground state energy becomes stronger while the photofluorescence intensity of QDs with higher ground state energy becomes weaker,and when the temperature reaches a certain value,the thermally quenching of the photofluorescence of all QDs will take place.关键词：self-assembled quantum dots;carrier;thermall transfer;photofluorescence113|82|0更新时间：2020-08-11
- 摘要：The self-assembled CdSe quantum dots (QDs) were fabricated on GaAs(110) substrate by in molecular-beam epitaxy (MBE) the Stranski-Krastanow (S-K) growth mode.By using temperature dependence PL spectra of CdSe QDs with 3ML(monolayer) and 10ML deposition thickness.We found the CdSe QW has strong emission only at low temperature and totally quenched at room temperature.The CdSe QDs keep the emission to room temperature due to the effect of quantum size confinement with three dimensions.As for the 3ML sample,it has six PL peaks from ZnSe barrier;CdSe QDs;1ML;2ML;1LO and 2LO assisted 2ML CdSe QW wetting layers at 20 K,respectively.From 20 to 200 K,the PL intensity of 1ML CdSe QW monotonly decrease and the peak energy red shifted heavily with the temperature raising.And we only observe two peaks for Cdso QDs and 2LO assisted 2ML at 300 K.The intensity decrease due to the exciton-phonon coupling enhanced with the increasing temperature,while the peak largly red shift was attributeed to the reduced band gap and the exciton-phonon coupling with increasing temperature.As for the 10ML sample,the PL intensity of CdSe QDs decrease quickly from 50 to 250 K.The thermal active energy for CdSe QDs is calculated.The energy of 34 meV is less than the differences between CdSe QW emission and CdSe QDs centre peak energy,so we attribute the CdSe QDs PL was quenched from the localized states.The PL intensity suddenly enhance from 250 to 300 K,the process is caused by the localized states released at higher temperature.The excitation power dependence of PL intensity spectra which have the linear relation verifies that the CdSe QDs emission is the free-exciton radiative recombination.In the mean time,the state filling effect in CdSe QDs is also observed by employing excitation power dependence of the PL peaks at 20 K.In comparison the PL spectra of 3ML with 10ML samples at 20 K,it is found that the ratio of CdSe QDs and CdSe QW PL intensities is com-pleteky different,the later(10ML sample) has higher intensity for CdSe QDs.As a result,the different CdSe active layers affect the strain relaxation and form the different size and distribution of CdSe QDs,the 3ML is the critical thickness for CdSe layers grown on the GaAs(110) substrate,while the 10ML is larger than that. So the different strain relaxation results in different CdSe QDs emission between 3ML and 10ML samples.关键词：Stranski-Krastanow mode;self-assembled growth;CdSe QDs;luminescence106|66|0更新时间：2020-08-11
- 摘要：ZnO is surely one of the most promising semiconductor materials in the future in the fields of opto-electronics,photochemistry and microelectronics,etc.Many techniques such as radio frequency or direct current sputtering,ion plating and chemical vapor deposition have been employed to prepare ZnO thin films,the sputtering process is the most promising method for depositing ZnO films among these processes.The advanta-ges of sputtering are the simple apparatus,high deposition rate,low substrate temperature,good surface flatness,transparency and dense layer formation.The properties of ZnO films are generally affected by the preparation conditions,such as deposition methods,working pressure,and the types of substrates,etc.In order to do a systematic research about effect of the oxygen/argon ratio on the microstrueture and the optical absorption properties,ZnO thin films with c-axis preferred orientation were prepared on glass substrates by r.f.coreactive magnetron sputtering technique,influence of oxygen partial pressure on the microstructure and optical absorption properties of ZnO thin films were studied by X-ray diffraction(XRD) and UV-Vis absorption spectra. The XRD patterns of the five ZnO samples were measured by XRD equipment.The figure which embo-died the relation of Full Width at Half Maximum (FWHM) of the diffraction peak and grain size of the five samples as a function of oxygen partial pressure was given out.The XRD patterns and the figure showed that relative intensity of (002) diffraction peak of the samples increased when the oxygen/argon ratio was under 14:10,but it then decreased when the oxygen/argon ratio near 18:10.The figure showed that the FWHM decreased and the grain size of the samples increased when the oxygen/argon ratio was under 6:10,but it then represented opposite trend when the oxygen/argon ratio was bigger than 6:10,and the sample which were prepared at the oxygen to argon ratio of 6:10 had the biggest crystal grain size and the least FWHM.The results showed that when the working pressure was kept in constant,the growth behavior of the ZnO thin film was mainly decided by the density of oxygen in the space where the sample was deposited,and the crystallization of the ZnO thin films was promoted by desirable oxygen partial pressure.In addition,absorption spectra of the five ZnO samples deposited at different oxygen partial pressures have been measured at room temperature,the films possessed a transmittance of about 90% in the visible region.The figure embodied (αhv)2 versus hv of ZnO films grown at different oxygen partial pressures was given out,too.It was concluded that with the increase of oxygen partial pressure,the band gap exhibited different values.Furthermore,theoretical calculations of the optical band gap were carried out using the quantum confinement model,the theoretical calculated values are in good agreement with the extrapolated results.It indicated that the change of band gap had great relationship with quantum confinement effect when the ZnO nanocrystals was small.The conclusion above is of great importance in preparing high-quality ZnO thin films,improving transmittance,accommodating absorption edge of ZnO films when it is used as transparent conducting layer.关键词：ZnO film;X-ray diffraction;optical properties;quantum confinement effect113|95|7更新时间：2020-08-11
- 摘要：In this article,all the white LEDs are obtained from the GaN-based blue emitter plus a cerium doped yttrium aluminum gargnet (YAG:Ce) phosphor.Here we brought up a new method.Under certain ideal condition,we have rough estimated the color coordinates and the luminous flux about the white light LEDs with the new method.The color coordinates of the referenced white spectrum is (0.325,0.332),the color rendering index is 81.5 and the color temperature is 5 914 K.All the parameters of the referenced white spectrum are similar to the standard white LED spectrum of (0.33,0.33).Based on the referenced spectrum,we simulated it and got the radiation intensities of the blue chip and the phosphor independently.By adjusting the proportion of the radiation intensities of the blue chip and the phosphor,we got some new white LED spectra.And here we defined the luminous flux of the referenced spectrum is 100 lm and the total photons of all the white LEDS is equal to the referenced white LED spectrum.Also the conversion efficiency is supposed to 100%.In the range of (x,y)= [0.33,0.33](±0.05),we calculated the luminous flux of different color coordinates around the standard point.We find that the color coordinate of the maximum lumi-nous flux is at (0.35,0.38)and the luminous flux is 112 lm,the color coordinate of the minimum luminous flux is at (0.29,0.28)and the luminous flux is 93.5 lm.So we can know that the luminous flux dispersion can reach about 18.5% relative to the referenced point 100 lm.From the above results,when the luminous flux becomes the main parameter of all the white LEDs’parameters,we can know that if we want to get higher luminous flux white LEDs,we should control the quantity of the phosphor to make the color coordinate around the point (0.35,0.38).Another experiment has been done too in this article.According to the data in the experiment,the changing trend that the luminous flux increases with the increasing of color coordinate is inosculated to the calculated results.And we also find that the luminous flux dispersion 28.1% is much larger than the calculated result,so the controlling of the color coordinate becomes more important.The main reasons of the different dispersions between theoretical calculation and experiment have been concluded as follows: First,the quantum conversion efficiency is supposed to 100% in the calculation,but it can’t reach in the experiment.Second,the blue chips are different types and even they are from the same silicon slice,they can’t be the same completely.Third,the unavoidable errors that exist in the experiment influence on the results.关键词：white light LED;luminous flux;color coordinate113|109|8更新时间：2020-08-11
- 摘要：Alumina is very important ceramic material;it has a unique combination of mechanical and optical properties.Alumina single crystal (sapphire) is commonly used as transparency window in shock wave mea-surements.When doped with Cr3+,alumina is used as a pressure calibrant in static high pressure experiments.In addition it is believed to be one of the major constituent of the Earth’s mantle.Understanding of its optical property under high pressure is very important for the use of it in high pressure experiments and other material regions.However,sapphire or other transparent windows are indispensable in shock temperature measurements of opaque material.Recently,a few of sapphire’s emission at lower than 50 GPa pressure range had been reported;whether this phenomenon detected at higher pressures is yet an open question.In this paper,infrared radiation of shock loaded sapphire has been observed to 172 GPa,using 1 ns time-resolved photomuhiplier.As an un-polished 20-micro-thickness copper foil being sandwiched by two sapphires for a shock target,the intensity received by photomnltiplier demonstrates a durative increase characteristic.It is the fact that thermal diffusion occurred at contact interface can’t cause this intensity-amplified current,the observed radiance continuously increases with time must origin from sapphire window.Under 130～172 GPa,the near infrared radiance of sapphire increases with shock stress.The fitting curve shows the absorptive parameter varies from 0.8 to 2.1 cm-1 at 850 nm in the experimental pressure range.Up to now,there is no quantitative calculation about the color temperature of shocked sapphire for explaining this emission.In the previous works,inhomogeneous hot spots distributed in shocked sapphire are regarded as the radiance source of sapphire,these hot spots,named"adiabatic shear band",are yielded by high speed local deformation.To our interpretation,adiabatic shear band usually exists in high-speed shock compressed material;its survival time depends upon the thermal conduction.Because thermal conduction of sapphire is obviously smaller than that of metals,as such shear band’s temperature can keep a high value in the period of experiment;and this temperature may also track the melting line which is suggested by D.E.Hare(2002).Therefore,obvious emission can be observed from residual heated spots behind shockwave.Based on the mechanism of local deformation,we made a preliminary quantitative model to explain the inhomogeneous emission of sapphire.This mathematic model is derived from an established slipping band theory by D.E.Grady (1982);the calculation shows the model can predict the unique temperature or apparent emission of shocked sapphire.In addition,sapphire’s slipping band temperature in calculation is roughly consistent with the emission temperature values estimated by D.P.Sebbana (2005) and D.E.Hare at lower pressures.In other words,the shear band’s temperature tacitly assumed that the emission is generated by the disjunet heated regions in sapphire window,not by sapphire’s total bulk.The difference of sapphire’s emissivity between the lower pressure and the more than 100 GPa pressure reveals that the density of emission eenters increases with pressure.Therefore,over 100 GPa pressure,sapphire’s radiation may disturb the intedaeial temperature measurement under shock compression.116|95|0更新时间：2020-08-11
- 摘要：In order to serving the space camera developing mission,it is necessary to study the feasibility of using LEDs as spaceborne calibration light sources.Structures of LEDs are introduced.The effects of deep level on LEDs’ radiant efficiencies are theoretically analyzed.The LED’s degradations with time are studied using Arrhenius model.In order to obtain the long hours working stability of LEDs,we designed an aging experiment for LEDs,Using Integrating Sphere to measured the Relative Radiant Intensity (RRI) of LEDs regularly.Then,the trends and the LEDs RRI curves via time are studied.Experimental results show that the LED RRI changes significantly during early aging.After 250 h continuous test,changes become stable.The total radiant attenuation of the relative intensity is less than 3% after 3 000 h aging and the changes of peak-value are less than 1.5%.The results agree with the requirement of spaceborne calibration.As a calibration reference,the LEDs’ radiant degradation are given.Finally,we estimate the life of LEDs theoretically.关键词：LED;luminescence;stability;calibration118|108|3更新时间：2020-08-11
- 摘要：The luminescence properties of nanosized lanthanide oxide materials have attracted extensive interest because of their fundamental and technological importance.Gd2O3,which is easily obtained due to abundant resource in nature,has been widely used as host material.The emission efficiency of Sm3+ associated with the intra-4f-shell transition is very high,and it earl emit bright light under both ultraviolet and infrared excitation.Therefore,it often plays a very important role in many luminescent materials.In this paper, Gd2O3:Sm3+ and Li+-doped Gd2O3:Sm3+ nanocrystals were prepared by a combustion method.The pure nanocrystals were obtained after annealing at 800℃,and the crystallinity was improved with increasing annealing temperature.Both Gd2O3:Sm3+ and Li+-doped Gd2O3:Sm3+ nanocrystals appeared to be cubic crystal-line phase according to the XRD results.In contrast to Gd2O3:Sm3+ which showed an irregular shape of ag-glomerated fine particles,the morphology of Li+-doped Gd2O3:Sm3+ nanocrystals were spherical and quite regular.These particles were measured to be about 50 nm in diameter.When excited at 275 nm and 980 nm, Gd2O3:Sm3+ and Li+-doped Gd2O3:Sm3+ nanocrystals exhibit similar emission spectra,which consist of the characteristic emission bands of the Sm3+ ions (4G5/2→6HJ,J=5/2,7/2,9/2 transitions at 560,602,650 nm in the spectra) due to an efficient energy transfer from the Gd2O3 host lattice to the doped Sm3+ ions.It was found that the incorporation of Li+ into the Gd2O3:Sm3+ nanocrystals has greatly enhanced the photolumi-nescence intensity of Sm3+ in both photoluminescence and upconversion emission.The highest emission inten-sity was observed with Gd1.83Li0.15Sm0.02O3,whose brightness was increased by a factor about 7.0 in comparison with that of Gd2O3:Sm3+.As we all known that defects of the surface of the nanoparticles,which provide non-radiation recombination routes for electrons and holes,often act as non-radiative centers and has great influence on luminescent properties.It can be suggested that the incorporation of Li+ can greatly decrease the deficiencies and oxygen vacancies.That is,the defects and oxygen vacancies of the surface of nanoparticles decreased at first when Li+ content was lower,which decreased the luminescence quenching centers and increased the crystallinity,thereby enhanced the emission intensity.A lot of defects could be induced in the system with a gradual increase of Li+ content.This will destroy the crystallinity and thus lead to the luminescence quenching.In conclusion,this paper reported the correlation between the morphology,structure and optical behaviors on Gd2O3:Sm3+ nanocrystals doped with Li+ Li+ doping at a low content significantly improved the morphology of phosphors and strongly enhanced the luminescent properties.关键词：Li+;Gd2O3：Sm3+ nanocrystals;enhanced photoluminescence99|60|3更新时间：2020-08-11
- 摘要：Nowadays preparation of inorganic nanoparticles dispersed in polymer nanofiber film has drawn great attention because this kind of nanocomposites combine the unique properties of inorganic nanoparticles (e.g.,the high ratio of surface atoms to inner sphere atoms and quantum size effect etc.) with the outstanding characteristics of polymer nanofibers (e.g.,the high specific surface area and high interpenetrating capacity in other materials etc.).Nanofibers of polyacrylonitrile were got by electrospinning.ZnSe/polyacrylo-nitrile fiber nanocomposites were prepared by hydrothermal in diethylene triamine/deionized water solvent mixtures at 180℃ for 6 h.Since spinning polyacrylonitrile materials which were acidic containing a certain amount of itaconic acid,Zn2+ coordinated with carboxyl,then grew up by bonding Se2- through covalent effect to yield ZnSe.The samples were characterized by X-ray diffraction (XRD),scanning electron microscopy (SEM),and the PL of nanocomposites blanket was analyzed by fluorescence.The results showed that when the volume ratio of diethylene triamine and deionized water was 1:3,the products would be got with complex topography.Both nanorods with 10～100 nm in diameter 50～500 nm in length and micron blooms with diameter of 4～10μm were got.The emission spectrum of the nanocomposites at an excitation wavelength of 260 nm gave a small peak at 352 nm and a high-wide peak at 427 nm at room temperature,all of these showed blue shift in respect to bulk ZnSe emission of 468 nm.These room temperature photoluminescence properties indicate that the as-prepared material may have potential applications in light-emission optoelectronic devices.关键词：zinc elenide nanocrystal;polyacrylonitrile;electrospinning;photoluminescence96|88|2更新时间：2020-08-11
- 摘要：The metal nanowires which have been synthesized by the porous anodic alumina (PAA)templates have excellent wire-grid structures,high transmittance and extinction ratio in the near infrared region.Therefore,the porous alumina with metal nanowires can be used as a near-infrared micropolarizer.Although this kind of micropolarizer has many advantages of smaller volume,simpler fabrication method and higher extinction ratio,its extinction ratio could not meet the requirement of the practical application. Based on the polarization principle of the metal wire-grid polarizer,we have analyzed the polarizing me-chanism of PAA with metal nanowires thoroughly.The reason why PAA films with metal nanowires have the properties of polarization is that the loss mechanisms to the P and S light components are different.Then,the metal nanowires with branched structure have been studied,and it could improve the extinction ratio of this kind of micropolarizers by using this branched structure. PAA alumina templates with branches structure were fabricated by the two-step anodic oxidation processes,and then the branched Cu nanowires were synthesized in the templates by alternating current deposition method.We observed the structure image of the samples by scanning electron microscopy,and measured the transmission spectrum and the polarization spectrum of the samples by the spectrophotometer.The transmittance of the Y-branched PAA template is achieved to 90% in the near infrared region,which means that the Y-branched PAA can also be taken as the template of the micropolarizers in this region.The experiment indicated that,such PAA alumina films with branched Cu nanowires have better transmittance in the near infrared region,and an extinction ratio of 14～22 dB was obtained in this region.Owing to the simple processing techniques,the high efficiency and the low cost,this kind of micropolarizer would have a promising future in the field of photoelectricity integration.关键词：micropolarizer;porous anodic alumina;extinction ratio;transmittance116|91|0更新时间：2020-08-11
- 摘要：Recent years,Bioluminescence which was catalyzed by firefly lueiferase involving lueiferin and ATP has been widely applied into the detection of ATP,counting of bacterium,environmental protection,new drugs screening and other biology researches.The firefly lueiferase in this research was extracted in Lucoila Chinesis L from ZheJiang province.Lucoila Chinesis L was a particular firefly which only inhabited in china mainland. First,Enzymology properties of firefly luciferase from Lucoila Chinesis L in this research was investigated that:Its relatively molecular mass was 6 400,Dynamic studies showed that it didn t behave characteristic of the typical Meehaelis-Menten enzyme.Both the dynamic curve for ATP and luciferin indicated an S shape. The optimum pH and temperature for the reaction involved the firefly luciferase were 6.5 and 20～25℃, respectively,and the activity of the firefly luciferase completely lost when the reaction temperature is above 30℃.This phenomenon indicated that the firefly luciferase was sensitive to the change of temperature. Second,some spectral characteristics also investigated.The wave length in the peak of light emission released from the reaction catalyzed by this firefly lueiferase did not demonstrated"red shift"phenomena when pH value dropped.Mg2+ and Mn2+ did the same thing when activating the firefly luciferase to a certain extent, while the Ca2+ did the 50% effect that Mg2+ or Mn2+ did.Like the Hg2+ and Cd2+,the Cu2+ can inhibit the activity of firefly luciferase in a certain degree.The firefly luciferase’s stability was weaker and it was very sen-sitive to the sun light and salt of high concentration.GSH and DTT were very useful in protecting the activity of the enzyme which can keep the activity of firefly luefferase during certain periods,and the GSH did a better job than the DTT did in protecting and enhencing the stability of this firefly luciferase under the same circum-stance.关键词：firefly luciferase(FL);bioluminescence;properties of enzymology;emission spectrum112|108|0更新时间：2020-08-11
- 摘要：The study of the rare earth complexes continues to be an active research area,which may be attributed to the specific spectroscopic and magnetic properties of rare earth ions and the abundance of rare earth elements in our country.Amide type podands,which are flexible in structure and have‘terminal-group effects’,will shield the encapsulated rare earth ion from interaction with the surroundings effectively,and thus achieve strong luminescent properties.The fluorescence intensities of Eu and rib complexes,which exhibit the characteristic emissions of Eu3+ and Tb3+ respectively,can be increased by mixing with some non-fluorescent ions quantificationally and their costs can be also decreased.So,in our work the white complexes of Eu3+, Tb3+,1/2Eu3+ and 1/2RE3+,1/2Tb3+ and 1/2RE3+ (RE3+=La3+,Gd3+,Y3+) with 1,6-bis[(2′-benzylaminoformyl) phenoxyl]hexane (L) have been synthesized in the solution of ethyl acetate and chloro-form. The elemental analysis shows that Eu and Th complexes conform to a 2:3 metal-to-ligand stoichiometfies 2RE(NO3)3·3L·nH2O(RE=La,n=2;RE=Eu,Gd,Tb,Y,n=4).Their IR spectra are recorded on a Bruke FTS66V/S spectrophotometer with KBr pellet in the range of 400～4 500 cm-1.The results indicate that all complexes have similar IR spectra,of which the characteristic bands have similar shifts,suggesting that they have a similar coordination structure.Their UV-VIS spectra are recorded on a Hitachi U-3010 spec-trophotometer and show that mixed with identical molar ratio of La,the absorbance of Eu-La mixed complex is lower than that of Eu complex. Fluorescence spectra of the complexes were carried out on a Hitachi F-4500 spectrophotometer at room temperature.The excitation and emission slit widths are 1.0 nm.The best excitation wavelengths for Eu and Tb complexes are 396 nm and 320 nm respectively.It can be concluded from the results that mixed with identical molar ratio of La3+,Gd3+ and Y3+,Eu (NO3)3 and Th(NO3)3 complexes exhibit the characteristic emissions of Eu3+ and Tb3+ respectively and their fluorescence intensities are sensitized and increased by La3+, Gd3+ and Y3+,of which Gd3+ has the strongest effect.But their peak positions did not change obviously.The mixed amount can also affect the fluorescence intensities of the mixed complexes.Take EuLa and ThGd complexes for example,when the molar ratio of Eu and La in the mixed complexes is equal to 0.9:0.1,the fluo-rescence of the complex is the strongest,and the same to TbGd complexes. In a conclusion,La3+,Gd3+ and Y3+ can sensitize and increase the fluorescence intensities of Eu and Tb complexes and do not change the peak positions.Moreover the mixed amount of these non-fluorescence ions can affect the sensitization.关键词：Eu complexes;Tb complexes;cofluorescenee effect;fuorescent spectra101|36|2更新时间：2020-08-11
- 摘要：The rare-earth carboxylate complexes are a kind of good luminous materials.With the tremendous progress of OEL,the research of rare-earth carboxylate complexes as electroluminescent device emitting layer material is increasing.The application prospects of these complexes become more and more broad.Tb (Ⅲ) earboxylate complexes are a kind of good green luminescence material.In our previous work,we found that some neutral conjugated heterocyclic ligands (such as phen or bipy) can enhance the luminescent intensity to some extent in Tb (Ⅲ) aromatic carboxylate compounds.In these studies about rare-earth aromatic carboxylate complexes,a lot of researches about the complexes of terbium with carboxylate have been reported,but the study of terbium complexes with halogen-benzoic acids as the first ligand is seldom reported.In order to compare the properties of the complexes in series,nine ternary complexes of rare-earth halogen-benzoic acids with 1,10-phenanthroline were synthesized in this paper.These complexes were characterized by elemental analysis,IR and TG-DTG methods.In these complexes,the Tb (Ⅲ) ions are bonded to the oxygen atoms of carboxylate and the nitrogen atoms of phen.The TG-DTG analysis showed that these complexes are thermally stable.The stability order of the complexes is:Tb (o-CIBA)3 phen>Tb (o-BrBA)3 phen>Tb (p-CIBA)3 phen>Tb(m-BrBA)3phen·H2O>Tb(o-FBA)3phen>Tb(p-BrBA)3phen>Tb (p-FBA)3phen>Tb (m-ClBA)3phen≈Tb(m-FBA)3phen·H2O.Their excitation and luminescence spectra were performed under identical conditions and instrumental parameters at room temperature.The results indicate that the fluores-cence intensity changes with the different substituent on the benzene ring or the same substituent in different positions.The order of their fluorescence intensity is Th (o-FBA)3phen>Th (p-FBA)3phen>Tb (m-FBA)3phen·H2O,Tb(m-ClBA)3phen>Tb(p-ClBA)3phen>Tb(o-CIBA)3phen,Tb(p-BrBA)3phen>Tb (o-BrBA)3 phen>Tb (m-BrBA)3 phen·H2O;Tb (o-FBA)3 phen>Tb (o-BrBA)3 phen>Tb (o-ClBA)3 phen, Tb (m-ClBA)3 phen>Tb (m-FBA)3 phen·H2P>Th (m-BrBA)3 phen>H2O,Tb (p-BrBA)3 phen>Tb (p-ClBA)3 phen>Th (p-FBA)3 phen [o(m,p)-F(Cl,Br) BA:(0 (m,p)-Fluorobenzoic (Chlorobenzoic,Bromo-benzoic) acid;phen:1,10-phenanthroline].关键词：terbium;halogen-benzoic acid;1;10-phenanthroline;ternary complex;fluorescent spectrum109|84|1更新时间：2020-08-11
- 摘要：Small organic luminescent molecule of 8-hydroxyquinoline aluminum (Alq3) as an active optical guest was incorporated into the one-dimension channels of MCM-41.The assemblies were characterized by means of XRD,IR and PL.The results from XRD patterns suggest that the Alq3-MCM-41 also have the typical mesoporous structure,but the channels were partially destroyed by the entrance of Alq3.The appearance of absorption band at 1 542 cm-1 in IR absorption spectra shows that there is strong binding force between MCM-41 and Alq3 in the assembly.As a result of the existence of Alq3,both of the Alq3-MCM-41 and the mechanical mixture have a strong absorption of the excitated light,although the form is different.In the former the Alq3 is bonded with the hydroxyl of MCM-41,while in the latter it is physically adsorbed in the surface.Alq3-MCM-41 has excellent luminescent property owing to the energy transfer between the host and the guest,which is mainly due to the mutual effect of the hybrid inorganic-organic material,and the luminescent intensity strengthens significantly as the content of Alq3 increases.So the luminescent efficiency is improved corre-spondingly.When it is up to 0.60 g,the relative intensity is as strong as that of the Alq3 powder.The micro-environment in the ordered channels of MCM-41 increases the dispersion of Alq3 molecules,decreasing the aggregation among the molecules,and then the luminescence intensity is effectively enhanced.It also can be seen that MCM-41 is a good host for the Alq3 molecule.The assembly synthesized has the advantage of both the inorganic mesoporous material MCM-41 and the organic Alq3,so Alq3-MCM-41 has a good heating, chemical and mechanical stability,it also has a strong luminescent efficiency.Thus the assembly having a steady luminescent property will make a new way for Alq3 in the application in electronic apparatus and establish a firm base for the synthesis of luminescent materials with excellent properties.关键词：MCM-41;Alq3;assembly;luminescence100|63|1更新时间：2020-08-11
- 摘要：In order to avoid the disadvantages of early PM-OLED driving and controlling circuits such as:the "cross talk"and"interference" phenomenon and much complexity,the circuits based on controlling IC LPC2210 and driving IC SSD1339 from Philips Corporation and Solonm Corporation respectively are designed in two ways.Structure and luminescent principle of OLED,SSD1339 and LPC2210 key features are introduced firstly.The two read and write timings of EMC on LPC2210 and 8080-series parallel interface on SSD1339 are compared and analyzed. SSD1339 is controlled to drive the 128RGB×128 dot-matrix OLED panel successfully in two ways by using GPIO and EMC on LPC2210.The experimental results show that beth ways can avoid the disadvantages of early driving and controlling circuits effectively,and make the panel display with good quality pictures.Using EMC,it is able to transmit about 80 pieces of picture in a second.Using GPIO,every steps of the data transmission can be tracked;therefore, it’s convenient to find the hidden mistakes.The experiment provides guidelines for designing PM-OLED driving and controlling circuits in different integrated situations.关键词：PM-OLED;driving and controlling circuits;LPC2210;SSD1339102|84|0更新时间：2020-08-11
- 摘要：This paper focused on the preparation of cuprous oxide thin films on flexible ITO substrates via electrochemical deposition in alkaline aqueous solution of sodium lactate and cupric sulphate.The vohammet-tic curves indicates two well-defined cathodic peaks at about-500 and about-800 mV (vs Ag/AgCl) due to the presence of cupric ions in the electrolyte,which were attributed to the formation of Cu and Cu2O on the substrate,respectively.The dependency of the cathodic potential on the growth temperature and the pH value of the electrolyte were investigated according to the cycle volt-ampere method.Lowering of the cathodic deposition potentials and increase in the deposition current are evident with the increase in temperature for both cathodic peaks.Both cathodic peaks were also shifted anemically with the decrease in pH value,accompanied with the increase in deposition current.As compared with that obtained in weak acidic aqueous solution,the tendency of anodic shift of these two cathodic peaks according to the decrease in pH value decreased obviously, which may stems from the fully ionization of lactate acid under alkaline circumstances and the excessive lactate acid as the ligand for both Cu (Ⅰ) and Cu (Ⅱ).The surface morphology and crystalline features of the deposited thin films were obtained by using the scanning electron microscope and X-ray diffraction methods,re-spectively.It was observed that the electro-deposition of Cu/CuzO nanocrystalline thin films on the flexible substrate is feasible in the deposition temperature and pH value range investigated in this work.And the surface morphology and crystalline features of the resultant deposits depends heavily on the cathodic potentials when the deposition temperature and pH value are the same.关键词：Cu2O;electrochemical deposition;flexible substrate97|56|0更新时间：2020-08-11
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