最新刊期
卷 34 ， 期 1 ， 2013
- 摘要：The birth of the concept of photonic crystal (PC) makes the dream of manipulating photon become reality. Possessing spatial periodicity in their dielectric constant on the length scale of the optical wavelength, PCs behave with electromagnetic waves just like atomic crystals do with electrons. As an electronic band gap is created by the periodic arrangement of atoms in a semiconductor, the periodic electromagnetic modulation created by a PC can yield a photonic stop band (PSB), which has significant modification on the spontaneous radiative rate and emission intensity of the fluorescent guest implanted in the PCs. The modification of PCs on spontaneous emission is attracting current interests due to its considerable scientific and technological values. In this article, after highlight the international development on this field, on emphasis, we will introduce our recent results on the preparation of three-dimensional lanthanide oxide PCs through the self-assembly method and the modification of PCs on spontaneous emission of rare earth ions. Recently, we observed a number of interesting phenomena, such as the observation of Lamb shift, inhibited long-scale energy transfer (ET) and improvement of luminescent quantum yield in lanthanide oxide inverse opal PCs.关键词：3D photonic crystal;ion;modification on spontaneous emission98|170|4更新时间：2020-08-12
Invited Paper
- 摘要：β-NaYF4: Eu3+@SiO2 nanoparticles were prepared by sol-gel method and were dispersed in the sol to obtain luminescent thin films through dip-coating process. XRD,SEM,TEM,FTIR,UVPC and PL were used to characterized the nanoparticles and transparent films. The results indicated that the oleic-acid was removed from the nanoparticles and SiO2 was coated on the particles successfully. The SiO2 shell has no influence on the crystalline structure and its fluorescence perfor-mance declines slightly. The morphology of β-NaYF4: Eu3+ transforms to nanospheres due to the solvent solution and tension of network structure of SiO2. The nanoparticles were dispersed in the thin films uniformly, and the films also have good transmittance and minus reflection effect. After coating and thermal treatment, the luminescence intensity from 420 to 500 nm was enhanced owing to the oxygen vacancy. But the luminescence at 613 nm quenches because of the energy transfer and nonradiative transition. The optimal technological parameters of the films were obtained by testing.关键词：sol-gel method;β-NaYF4：Eu3+;SiO2 coating;luminescent thin films77|30|4更新时间：2020-08-12
- 摘要：Green long lasting phosphors of CaSnO3:Tb3+have been successfully synthesized by solid-state reaction. The crystal structures of CaSnO3:Tb3+samples were analyzed by means of X-ray powder diffraction (XRD). The influence of Tb3+ concentrations on the luminescent intensities was investigated. The results show that the intensities of the phosphors increase, and then decrease with the Tb3+ions concentration, which means there exist concentration quenching. The optimized mole fraction of Tb3+ is 0.3%. The emission spectra display four main emission peaks, locating at 492, 546, 588 and 623 nm, respectively. The intensity of the emission peak originating from 5D4→7F5 transition is the strongest. By measuring the temperature character of the phosphors, the activation energy for thermal quenching process is 0.58 eV and the depth of trap is calculated to be 0.622 eV. Moreover, the possible mechanism of the green long lasting phosphorescence is proposed based on the experiment results.关键词：CaSnO3：Tb3+;long lasting phosphor;trap depth86|53|0更新时间：2020-08-12
- 摘要：A series of Ba3La1-x(PO4)3:xDy3+ phosphors were synthesized by a solid-state reaction method. The phase of the as-prepared samples were measured by X-ray diffraction pattern (XRD), and the results showed that the samples were pure phase. The exciation spectrum includes a series of wide bands and the peaks which locate at 322, 347, 360, 386, 424, 451 nm. The phosphor exhibits intense emission at 482 nm(4F9/2→6H15/2) and 575 nm(4F9/2→6H13/2) under 347 nm exciation. The effect of the doping concentration of Dy3+ was investigated, the concentration quenching occurred when x=0.10 and the mechanism of concentration quenching was dipole-dipole interaction. The decay lifetime of different Dy3+-doped concentrations of Ba3La(PO4)3:Dy3+ phosphors was confirmed. The chromaticity coordinates of Ba3La(PO4)3:Dy3+ phosphors were measured, which were in the white region.关键词：luminescence;phosphor;white-emitting;Ba3La(PO4)3：Dy3+90|63|4更新时间：2020-08-12
paper
- 摘要：BaSnO3 nano-phosphors were prepared by solvothermal method using glycol-water mixed solution as a solvent, followed by calcinations at different temperature. The as-synthesized samples were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), the nano-particle size analyzer, UV-Vis-NIR spectrophotometer, excitation and emission spectra. The nano-powders are sphere with sizes of 30~50 nm. Good dispersity can be achieved even after the sample was calcined. Efficient near-infrared fluorescence with emission peak of 895 nm was observed under the excitation of 385 nm. Comparing with the sample prepared by solid state reaction, the emission intensities increase about ten folds. The degree of crystallization is found to be the main fact of the near-infrared fluorescence of BaSnO3 nanoparticles.关键词：solvothermal;near-infrared;BaSnO3 nano-powders81|74|1更新时间：2020-08-12
- 摘要：Potassium zinc phosphate (KZnPO4) was synthesized by solid-state reaction using K3PO4·3H2O and ZnSO4·7H2O as reagents. Experimental project was designed by uniform design and data mining technology. The obtained product was characterized by X-ray diffraction, scanning electron microscope and energy disperses spectroscopy, and its property of long lasting phosphorescence was also studied. Based on the yield and zinc content, two mathematical models were established by regression analysis. The best technology conditions of synthesis can be obtained by optimization of these two models. Under the optimum reaction conditions: molar ratio of n(K3PO4·3H2O):n(ZnSO4·7H2O)=1.01, grinding time 31 min, holding temperature 750℃, holding time 3.2 h, the prepared product is KZnPO4 with nano-lamellar structure. After ultraviolet radiation, the obtained product show blue-green long lasting phosphorescence and the highest emission peak is located at 415~530 nm.关键词：luminescent material;potassium zinc phosphate;data mining technology;nano-lamellar94|124|0更新时间：2020-08-12
- 摘要：A series of samples 2MgO·Al2O3·P2O5 doped with Eu, Tb, Mn were prepared by the solid state reaction at high temperature. And their photo-luminescent properties were investigated. The phosphor 2MgO0.95·Al2O3·P2O5:0.02Eu, 0.02Tb, 0.01Mn can exhibit intense red, green, and blue light emiss under near-UV light excitation. The luminescent properties were investigated and its CIE chromaticity coordinates (0.35, 0.25) are close to white light region. The phosphor has potential application for near-UV emitting diodes.关键词：phosphors;optical properties;white light97|103|0更新时间：2020-08-12
- 摘要：The grapheme samples were deposited on glass substrates by chemical vapor deposition(CVD). Both the length and width of graphene samples were 1.23 cm, and the thickness was 3 atomic layer thickness setting scales. The Hall effects at room temperature of the samples were studied. There was good ohmic contact between the sample and the electrode. By using van der Pauw method, the Hall voltage of the samples were measured under the magnetic field strength 0.353 T and different electric currents. The calculating results show that the graphene Hall coefficient RH is 7.00×10-7 m3/C, the carrier concentration n is 10.52×1024/m3 and the Hall element production sensitivity KH is 6.87×102 m2/C.关键词：graphene;measurement;Hall effect145|210|2更新时间：2020-08-12
- 摘要：Optical radiative parameters for multichannel visible transition emissions have been determined in Sm3+-doped cadmium-aluminum-silicate (CAS) glass under the excitation of a violet light emitting diode (LED). For the derivation, the necessary fluorescence spectra were measured and calibrated in an integrating sphere, which was connected to a CCD detector with a 400 μm-core optical fiber. The spectral power distribution and luminous flux distribution of the sample under the violet LED excitation have been obtained. And the total radiant flux and total luminous flux for the entire visible region have been calculated to be 712 μW and 12.1 mlm, respectively. The radiant flux and luminous flux for the four visible emission bands of Sm3+ were derived to be 36 μW and 9.7 mlm, which occupied 5% and 80% of the whole. The total quantum yield of the visible fluorescence of Sm3+ is 2.3%. Investigations on absolute spectral parameters for multichannel visible transition emissions of Sm3+ in CAS glass provide a valuable reference for heavy metal silicate glass in developing efficient display and illumination devices.关键词：radiant and luminous fluxes;samarium ions;heavy metal silicate glass90|67|1更新时间：2020-08-12
- 摘要：High-temperature resistant rare earth complexes Tb(4-FBA)3·2H2O and Tb(4-ClBA)3·2H2O were synthesized using 4-halogenated benzoic acids (4-fluorobenzoicacid and 4-chlorobenzoicacid) as ligands, respectively. They were characterized by the UV-spectra and fluorescent spectra and were compared with Tb(4-BrBA)3, which was synthesized by previous work. The UV spectra revealed that absorption intensities of the three kinds of terbium complexes Tb(4-FBA)3·2H2O, Tb(4-ClBA)3·2H2O and Tb(4-BrBA)3 in turn increased with the same molar concentration. The fluorescent spectra showed that the fluorescent intensity of Tb(4-ClBA)3·2H2O was the strongest. The relationship among energy level of the ligands, the ability of complexes absorbing UV energy and the non-radiative transitions was investigated for the experimental results. The thermal analysis indicated that Tb(4-FBA)3·2H2O and Tb(4-ClBA)3·2H2O started to lose weight around 100℃, suggesting the decomposition of crystal water and adsorbed water of the complexes, and the further mass loss around 450 ℃ belonged to the rapid decomposition of the complexes. When the two kinds of complexes placed in a muffle furnace were heated at 350 ℃ for 1 hour, it was disco-vered that the strongest fluorescence intensity of the Tb(4-FBA)3·2H2O reduced by 24% and Tb(4-ClBA)3·2H2O reduced by 13%. The IR spectra of the two kinds of complexes after heated showed that they did not decompose at high temperature.关键词：terbium complexes;4-halogen benzoic acid;fluorescent;thermal stability83|116|6更新时间：2020-08-12
- 摘要：Titanium oxysulfate (TiOSO4) was used as an inorganic titanium precursor to synthesize TiO2 nanorods on a transparent, conductive fluorine-doped tin oxide (FTO) substrate by a facile hydrothermal process. The TiO2 nanorod film was rutile phase and exhibited an array-cluster double-layered structure. Under the illumination of a solar simulator, the short-circuit photocurrent density of TiO2 nanorods maximized at 0.17 mA/cm2, which was over twice that of samples originating from organic titanium isopropoxide [Ti(iPro)4] under the same conditions. Multi-dimensional structure and the participation of inorganic oxysulfate (OSO44-) anion contribute to the enhanced photocurrent response of TiO2 nanorod films.关键词：TiO2 nanorod;hydrothermal method;morphology;photoelectrical property92|78|0更新时间：2020-08-12
Synthesis and Properties of Materials
- 摘要：The internal quantum efficiency (IQE) of InGaN quantum wells (QWs) light-emitting diodes (LEDs) is numerically investigated, which involved its emission spectra, carrier concentrations, energy band, electrostatic field and internal quantum efficiency. Optical properties of InGaN/GaN LEDs with varied QW numbers are numerically studied. The results reveal that, for the LEDs with conventional rectangular shaped QWs, two quantum wells (2-QWs) units structure has better optical performance than 5-QWs and 7-QWs structures. The advantages of nitride-based LEDs with triangular shaped InGaN/GaN multiple quantum wells (MQWs) are also discussed. The simulation results indicate that the triangular shaped MQW LEDs exhibit a higher electrical luminescence (EL) intensity, higher IQE and a stronger light-output power than the conventional rectangular MQW LEDs. All the advantages are due to the higher carrier injection efficiency and recombination rate which are caused by the higher electron-hole wave function overlap, and small quantum confined stark effect (QCSE).关键词：light-emitting diodes;triangular shaped quantum well;numerical simulation117|129|2更新时间：2020-08-12
- 摘要：A new type of optical signal transmission system based on organic light-emitting devices (OLED) has been investigated using direct light intensity modulation method. The results show that the response speed of OLED is significantly related to its emitting layer, light-emitting area and preset direct current voltage bias. The response speed can be improved by doping rubrene in Alq3 emitting layer with shorter fluorescence lifetime. And 100 Mbit/s of the transmission speed has been realized from OLED with a 0.02 mm2 of light-emitting area. Finally, flexible OLED combined with organic polymeric waveguide and organic photoelectric diode has been proposed to realizing the organic photoelectron system.关键词：optical communications;organic light emitting diode;photoelectron;response speed;photoelectric conversion96|164|3更新时间：2020-08-12
- 摘要：The thermal neutron detection efficiency, emergent light yield and γ sensitivity of EJ426 scintillator with 6LiF/ZnS(Ag) blended was systemically researched. The results indicate that thermal neutron of EJ426 scintillator detection efficiency is 32.4%, emergent light yield 8.01×103 photon/neutron. When the threshold value is 70 mV, its sensitivity is less than 10-7, which proves that it is an ideal material for scintillator-based position-sensitive neutron detectors.关键词：6LiF/ZnS(Ag) scintillators;thermal neutron detection efficiency;light yield;γ sensitivity147|203|6更新时间：2020-08-12
- 摘要：Gallium-doped zinc oxide (ZnO:Ga) and phosphorus-doped zinc oxide (ZnO:P) films were separately prepared on Al2O3 substrates by metal organic chemical vapor deposition (MOCVD) method. The microstructure, electrical and optical properties were studied by X-ray diffraction (XRD), scanning electron microscopy, Hall effect measurement, the room temperature photoluminescence (PL) spectrum, respectively. The n-type ZnO films with a carrier concentration of 1×1019 cm-3 and p-type films with carrier concentration of 1.66×1016 cm-3 were obtained. SEM images showed the films had highly oriented columnar structure. PL spectrum displayed p-type ZnO films showed good optical qualities.93|148|0更新时间：2020-08-12
- 摘要：In order to measure and research the localization of random media, coherent backscattering (CBS) from ZnO random media is investigated and spatial distribution of electric field of random particles with different concentration is obtained. We studied the distribution of coherent backscattering intensity with different size parameters and different thickness of random media. The results show that under the condition of identical refractive index, the bandwidth of coherent backscattering becomes narrower with the increase of size parameters and the decrease of the concentration. In addition, kl parameter is amplified leading to the localization level is relatively decreased. Further investigation of these issues is significant in decision of localization of light and new energy.关键词：random media;coherent backscattering;localization105|159|0更新时间：2020-08-12
- 摘要：Green and bluish-green organic light emitting diode (OLEDs) devices based on Ir(tfmppy)2(tpip) [1, tfmppy=4-trifluoromethylphenylpyridine, tpip=tetraphenylimido-diphosphinate] and Ir(dfppy)2(tpip) [2, dfppy=[JP]4,6-difluorophenylpyridine] as emitters were constructed with the device structure of ITO/TAPC (1,1-bis[4-[N,N-di(p-tolyl)amino]phenyl]cyclohexane, 60 nm)/Ir(Ⅲ) complex (x%, mass fraction): SimCP (3,5-bis(9-carbazolyl)tetraphenylsilane, 40 nm)/TPBi (2,2',2"-(1,3,5-benzinetriyl)-tris(1-phenyl-1-H-benzimidazole, 60 nm)/LiF (1 nm)/Al (100 nm). Green device with 6% 1 doped concentration showed a maximum current efficiency of 47.10 cd/A at 5 930 cd/m2, a maximum brightness of 38 674 cd/m2 at 16.4 V with (0.28, 0.65) at Commission Internationale de LEclairage (CIE) coordinates. Bluish-green device with 10% 2 doped concentration exhibited a current efficiency of 14.80 cd/A at 3 175 cd/m2, a brightness of 25 985 cd/m2 at 11.8 V CIE coordinates of (0.15, 0.50).关键词：iridium(Ⅲ) complexes;organic light emitting diodes;luminance;efficiency;current density95|100|0更新时间：2020-08-12
Device Fabrication & Physics
- 摘要：A novel hybrid ridge plasmonic waveguide with a gain medium layer is presented based on the traditional ridge waveguide. Dielectric layer in the hybrid ridge plasmonic waveguide contains two parts: the first part is a single dielectric area and the second part is a double-layers ridge area containing two kinds of dielectric. The 2D-FDTD method is used to analyze transmission characteristics of the waveguide structure. The electric field distribution of TM mode is given. The dependence of output power and transmission loss on structural parameters and refractive index are discussed. The results show that the transmission loss is up to with the help of the gain medium. The waveguide structure can be applied to the research and fabrication of optical integrated chip.关键词：hybrid plasmonic waveguide;gain medium;transmission characteristics83|159|1更新时间：2020-08-12
- 摘要：Based on photosensitivity and a special affinity on tumor cells and anti-tumor activity for thionucleoside compounds, 4-thiothymidine was designed and synthesized. The structure was characterized by NMR, UV, MS. The interactions between 4-thiothymidine and human serum albumin (HSA) were also investigated by the fluorescence spectroscopy. The results show that 4-thiothymidine on HSA has a static fluorescence quenching, the binding constants of 4-thiothymidine and HSA are 3.46×104,3.91×104,4.31×104 L·mol-1, respectively. The determination of thermodynamic parameters at different temperatures for 4-thiothymidine and HSA was investigated, the results show that the main forces of both interactions have typical hydrophobic interaction from thermodynamic data to determination. In addition, the effect of 4-thiothyminidine on the secondary structure of HSA was investigated by circular dichroism, the results show that 4-thiothyminidine has no effect on the secondary structure of HSA.关键词：4-thiothymidine;human serum albumin(HSA);nucleoside;fluorescence spectroscopy;circular dichroism spectroscopy(CD)89|105|2更新时间：2020-08-12
- 摘要：Fluorescent carbon nanoparticles were prepared by electrochemical methods using pyrolytic graphite as raw materials. The effects of lead ion solutions with different concentrations on light emission of carbon nanoparticles were systematically investigated and the roles of reaction time, pH values, and temperature played were also considered in this paper. Experimental results show that lead ions can change the intensity of photoluminescence (PL) from carbon nanoparticles rather than its spectral shape. The effects of lead ions on PL of carbon nanoparticles reduce with the increase of reaction time, and change with pH values. In addition, the higher temperature can strengthen the effects of lead ions on PL intensity of carbon nanoparticles. The possible mechanism could be attributed to charge transfer and Brownian movement.关键词：carbon nanoparticles;lead ion;fluorescence;detection81|117|0更新时间：2020-08-12
- 摘要：Based on the phenomenon that hydroquinone can obviously inhibit the CL signal of the luminol-H2O2 system sensitized by CdTe QDs in basic medium, a novel flow-injection chemiluminescence method for the determination of hydroquinone has been developed. Under the optimum conditions, the linear range for the determination of hydroquinone was 1.0~25 nmol·L-1 with a detection limit of 0.76 nmol·L-1 calculated as proposed by IUPAC and a relative standard deviation of 2.56% for 11 solutions of 4.0 nmol·L-1 hydroquinone. The proposed method can be used to determine hydroquinone content in water samples from the environment and satisfactory results were obtained without interferences from the sample matrix. Furthermore, the possible enhancement mechanism of CdTe QDs on luminol-H2O2 CL was further investigated.关键词：Hydroquinone;CdTe;quantum dots;environmental detection;chemiluminescence95|145|1更新时间：2020-08-12
Luminescence Applications and Interdisciplinary Fields
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