最新刊期
卷 34 ， 期 5 ， 2013
- 摘要：Organic photoelectric devices including organic light-emitting devices (OLEDs) and organic photovoltaic cells (OPVs), etc, have great potential applications in flat-panel display, solid-state lighting and energy. OLED is a promising technology for display due to its high efficiency, excellent color gamut and quick response. OPV has the advantages of light weight, low cost and flexibility. Surface plasmon resonance of metal nanoparticles could improve the efficiency of OLED and OPV. This paper reviewed the research progress of high-efficiency OLED/OPV with metal nanoparticles and discussed the prospective applications.关键词：organic photoelectric devices;metal nanoparticles;surface plasmon resonance122|179|3更新时间：2020-08-12
- 摘要：Y2O3:0.20Yb3+, 0.03Er3+ and Y2O2S: 0.20Yb3+, 0.03Er3+ and NaYS2:0.20Yb3+, 0.03Er3+powder samples were synthesized with solid-state and solution reacting methods, respectively. The upconversion (UC) emission properties under a continuous-wave semiconductor laser diode excitation at 980 nm were studied. The relationship between UC emission features and the hosts was explored. Effects of the S2--Yb3+ and S2--Er3+ charge transfer state (CTS) on the transfer-energy rate from Yb3+ to Er3+ and the transition rate between the Er3+ levels were analyzed in details. Furthermore, the energy-transfer processes between Yb3+ and Er3+ based on the energy matching conditions and the UC emission mechanism were discussed with schematic energy-level schemes.关键词：upconversion emissions;rare earths;CTS96|38|0更新时间：2020-08-12
- 摘要：The objective of this work was to improve the stability and reproducibility of CaS:Eu,Sm phosphors in a real-time dosimetry system. Different volumes of tetraethyl orthosilicate, were used as precursor and coated onto CaS:Eu,Sm phosphors by the sol-gel method. The luminescence properties and water resistance of the phosphors were evaluated using a fluorescence spectrometer and an acidometer respectively. The results show that 5%(mass fraction)of silica coating effectively improve their water resistance with minimum loss of light emission. The optically stimulated luminescence (OSL) decay and dose response of coated CaS:Eu,Sm phosphors offer an easy evaluation of the annealing time and specify dose. The dose characteristic is linear from 0.1 to 300 Gy. The 5% SiO2-coated CaS:Eu,Sm phosphors' variation of the reusability is below 2% at dose of 1 Gy. The amount of surface coating significantly affected the OSL signal, which became more pronounced with the increasing radiation dose. A novel dosimetry system based on the OSL technique is proposed for real-time measurement.关键词：CaS:Eu;Sm;OSL;silica encapsulation;sol-gel102|92|1更新时间：2020-08-12
- 摘要：Tb3+-doped Gd2O3 particles were synthesized in a polyol (diethylene glycol) medium. Core-shell nanoparticles Gd2O3:Tb3+/SiOx were obtained by encapsulating Gd2O3:Tb3+ in a polysiloxane shell. In order to study the effect of Tb3+ ion doping concentration on luminescent properties of particles, synthesis were carried out with different Tb3+ doping concentrations, then luminescence of nanoparticles was measured. The result showed that nanoparticles Gd2O3:Tb3+ coated by polysiloxane were well-dispersed, and polysiloxane shell did not diminish luminescence of nanoparticles Gd2O3:Tb3+.Tb3+ doping concentration effected the luminescent properties of core-shell particles Gd2O3:Tb3+/SiOx by a quenching phenomenon when the Tb3+ doping mole fractioin exceeded 5%. The luminescent core-shell nanoparticles can be used as a biosensor probe in the detection of biological molecules.关键词：core-shell structure;Gd2O3：Tb3+/SiOx;Tb3+ doping concentration;luminescent89|87|2更新时间：2020-08-12
- 摘要：By introducing Ag nanocrystallites into rare earth ions doped tellurite glass, the fluorescence intensity were enhanced through surface plasmon resonance (SPR), and the up-conversion luminous efficiency were improved obviously. The influence of Ag nanocrystallites on Tm3+/Yb3+ co-doped tellurate glass was studied, and the up-conversion luminescence mechanism was also discussed. The results show that Ag nanocrystallites with the size from 5 to 8 nm were gained by heat treatment under 330℃ for 30 min. After introducing Ag nanocrystallites, the three-photon absorption of blue-red transition in glass turn to two-photon absorption. Because of the enhanced local field surface plasmon resonance and the energy transfer between Ag and Tm3+, the fluorescence intensity of Ag-contained glass is 5 times more than glass without Ag nanocrystallites.关键词：Tm/Yb;tellurite glasses;Ag nanocrystallites;upconversion luminescence mechanism103|85|0更新时间：2020-08-12
- 摘要：A green laser-sensitized epoxy resin photopolymer holographic storage material based on a two-chemistry system is prepared. The high optical transparency of photopolymer film is got by designing low refractive epoxy resin matrix system and high refractive write-in monomer system properly. When film thickness is 219 μm, the maximum diffraction efficiency is 84.3%, the sensitivity is 5.74×10-3 cm2/mJ, the maximum refractive index modulation is 8.69×10-4, and volume shrinkage is 0.32%. An experiment was demonstrated, in which the epoxy resin photopolymer material was used as the shooting of a reflection hologram on coin.It indicates that such material has a resolution of up to 5 000 lp/mm.关键词：holographic storage;epoxy resin;two-chemistry system;Irgacure 784114|194|2更新时间：2020-08-12
- 摘要：The Eu-doped ZnO (ZnO:Eu) nanorod arrays have been successfully synthesized on nanoporous silicon pillar array (NSPA) substrates by hydrothermal method. The effective energy transfer from ZnO host to the doping ions has been revealed. The ZnO:Eu nanorod arrays could enrich the emissions of ZnO nanostructure, moreover, the fabrication method is simple under mild reaction condition. The presence of trivalent europium ions in ZnO crystal lattice has been confirmed by X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). Under the ultraviolet (UV) laser excitation, ZnO-related UV and near band energy blue-green emission and Eu3+-related red emission were observed, which were attributed to the emission of ZnO, the band edge transition, the intrinsic defects and the Eu3+ ions transition,respectively. Based on the energy band diagram, the photoluminescence (PL) mechanism has been discussed, as well as energy transfer occurs from ZnO host to Eu3+ ions through intrinsic defects states of ZnO in ZnO:Eu nanorods structure.关键词：europium;ZnO nanorod arrays;hydrothermal;photoluminescence167|290|5更新时间：2020-08-12
- 摘要：A new fluorene derivative, 2,7-bis(3-cyanophenyl)-9,9-diethyl-fluorene has been synthesized and characterized by elemental analysis, FT-IR spectra, 1H NMR and X-ray single crystal diffraction. The compound crystallizes in orthorhombic, space group Pnma with a=1.380 0(3)nm, b=2.230 6(4) nm, c=0.726 33(15) nm, V=2.235 8(8) nm3, Z=4,Dc =1.261 g/cm3, μ(MoKα)=0.073 mm-1, F(000)=896, S= 1.013, the final R=0.046 9 and wR=0.104 2. The UV-Vis absorption and fluorescence spectra of the title compound were investigated. Under excitation of 330 nm at room temperature, the compound showed intense blue fluorescence with an emission peak of 408 nm. The fluorescence quantum yield of the title compound in CH2Cl2 solution is 0.64 and the Stokes shift between the UV-Vis absorption and fluorescence maxima is 56 nm for the film. This compound may be suitable as a promising candidate for blue-emitting material.关键词：fluorene;synthesis;crystal structure;spectroscopic properties95|189|3更新时间：2020-08-12
- 摘要：Thiol Schiff base compounds can be used for the preparation of fluorescent probe,biological immune analysis,enviromental testing, food residues detection and clinical medicine detemination.Herein,we took quantum chemical B3LYP method to study geometry optimization of 1,4-phthalaldehyde thiol Schiff base derivatives at 6-31G basis set level,the expermental results show that there is no imaginary frequency based on vibration analysis.Moreover,TD-FT method was used to calculate the fluorescent spectra of Three Thiol Schiff base derivatives,they are consistent with the experimental values.Theoretical calculations show that 1,4-phthalaldehyde thiol Schiff base derivatives are pronising fluorescent materials.关键词：Thiol Schiff base derivatives;fluorescent molecular switch;quantum chemistry127|80|2更新时间：2020-08-12
- 摘要：A novel white-light emission for full color emission Sr1-xB6O10:xDy3+ phosphor was synthesized at 900℃ in air by solid-state reaction route. The crystal structure and photoluminescence proerties were characterized by XRD and fluorescence spectra, respectively. The results show that the incorporation of Dy3+ ions do not change the single-phase structure of SrB6O10. The PL spectra show the excitation peaks range from 300 to 400 nm is due to the 4f-4f transitions of Dy3+. This mercury-free excitation is useful for solid state lighting and light-emitting diodes (LEDs). The emission of Dy3+ ions upon 349 nm excitation is observed at 484 nm (blue) due to the 4F9/2→6H15/2 transitions, 579 nm (yellow) due to 4F9/2→6H13/2 transitions, respectively. The emission intensity of the 4F9/2→6H15/2 transition under 349 nm excitation related to Dy3+ doping concentration (x value),which increases rapidly with the increase of Dy3+ concentration, and reaches a maximum value at 4%, then decreases with increasing Dy3+ ions due to the concentration quenching. For Sr1-x-B6O10:xDy3+ phosphor, the three-dimensional network of BO4 tetrahedra acts as a shield. It can isolate the Dy ions from each other,and resist the concentration quenching. By simulation of white light, the CIE chromaticity coordinates for Sr1-xB6O10:xDy3+ phosphors located in the bluish-white region. All the results imply that the Sr1-xB6O10:xDy3+ phosphors could be potentially used as white LEDs.关键词：solid-state reaction route;Sr1-xB6O10：xDy3+;white-LEDs102|105|0更新时间：2020-08-12
- 摘要：Graphene oxide was explored as doping material that doped into hole transporting layer (NPB) and electron transporting layer (Alq3) via thermal co-evaporation respectively to fabricate two types of OLED devices. The experimental results indicated that thermal co-evaporation of graphene oxide with Alq3 act as electron transporting layer can improve the device performance while with NPB as hole transporting layer decrease the performance. And it turns out that device doped 10% graphene oxide in Alq3 layer exhibited 1.2 fold higher of luminance and 2 fold higher of current efficiency than that of updoped one.关键词：graphene oxide;NPB;Alq3;co-evaporation doped;OLED123|88|4更新时间：2020-08-12
- 摘要：The structure of ITO/P3HT/TiOx/TiOx nanoparticle/alheterojunction organic solar cell was fabricated by the specific film technology. Titanium oxide layers were made by using different TiOx precursors. The effect of the TiOx layer on the performance of the solar cells was studied. We found that the devices made by the TiOx layers mixed with organics result in effective open-circuit voltage but correspondingly lower short-circuit current. The effection of low temperature annealing and thickness optimization of TiOx layers on the performance of devices was studied. Applying room temperature technology to prepare TiOx precursor solution not only gets the excellent results but also simplifies the process.关键词：TiOx;poly(3-hexylthiophene);polymer solar cells;precursors109|132|0更新时间：2020-08-12
- 摘要：The process of optical fiber probe production was introduced in this paper, as well as the attachment of silver nanoparticles, the enhanced effect of silver nanoparticles in fiber-optic probe inhomogeneous electromagnetic field of was simulated using the finite difference time domain method. Firstly, the electric field distribution of different shapes of the fiber polymer probe tip was discussed, and it provided a reference for the research of nanoparticles polarization effects; Secondly, the polarization affecting factors of single nanoparticle were simulated, the radius of silver nanoparticle and its distance to the probe were taken into consideration; Finally, taking two silver nanoparticles for example, the polarization effect of particles relative position were discussed,which proved that the silver nanoparticles outside the top of the fiber probe do not contribute to the polarization effect. The simulation results of this paper provided a theoretical support for the production of the fiber-optic probe and the attachment of metal nanoparticles.关键词：nanoparticle;optical fiber probe;inhomogeneous field;FDTD99|120|0更新时间：2020-08-12
- 摘要：This paper researched the Cobalt 60-γ total dose radiation test for the CCD KLI-2113 from Kodak Company by comparing the main parameters shift before and after radiation.The effect of the total dose radiation on the performance of CCD was analyzed. The results indicate that the radiation induces the increase of the dark current, the decrease of charge transfer efficiency, the increase of picture noise. There result provides reference for the total dose resistant radiation hardening in future.关键词：CCD;total dose radiation;dark current;charge transfer efficiency;damage mechanism79|108|2更新时间：2020-08-12
- 摘要：A random laser structure is proposed in which we symmetrically embed a toroidal waveguide in the randomly distributed scattering particles. The finite difference time domain (FDTD) method is used to numerically simulate the distribution of the optical filed in the random scattering system embedded with a toroidal waveguide and the corresponding comparative structures, and the modes spectra of each structure are obtained. The results show that there only exists a narrow linewidth lasing emission in the center of system, which verifies that the presence of the toroidal waveguide can influence the lasing emission of the random system, reduce the number of modes, and enhance the lasing intensity to a certain degree.关键词：random lasers;finite difference time domain;toroidal waveguide;lasing modes110|214|0更新时间：2020-08-12
- 摘要：The influence of multiple quantum wells with different barriers on the characteristics of the near ultraviolet light emitting diodes was numerically investigated. Using single GaN, single Al0.1Ga0.9N, trilaminar Al0.1Ga0.9N/Al0.15Ga0.85N/Al0.1Ga0.9N as barriers to study the characteristics of internal quantum efficiency, carriers concentration and radiative recombination rate. For trilaminar Al0.1Ga0.9N/ Al0.15Ga0.85N/Al0.1Ga0.9N barrier, choose two different thickness ratio, 6 nm/8 nm/6 nm and 7 nm/6 nm/7 nm. The simulation results show that LEDs with AlGaN barriers have better performance than GaN barrier LED. For AlGaN barrier LEDs, more carriers can be confined in active region, especially hole concentration, can improve one order of magnitude approximately. The radiative recombination rate can increase 2~10 times. Compared with single AlGaN barrier LED, in trilaminar AlGaN barrier LEDs the carriers concentration is more uniform. And the radiative recombination rate increases about 7 times, the internal quantum efficiency improves 14.5%. The different thickness ratio of trilaminar AlGaN barrier LED can fine adjust the inclination of energy band, then reduce the negative effects on carriers concentration and internal efficiency caused by polarization.关键词：near ultra-violet LED;multiple quantum wells;barrier;AlGaN107|176|0更新时间：2020-08-12
- 摘要：Heterojunction photoresponsive organic field-effect transistors (PhotOFETs) based on palladium phthalocyanine (PdPc) and C60 were fabricated. PhotOFETs with the structure n+-Si/SiO2/C60/PdPc/Al(S&D) (C60/PdPc-OFET) exhibit a higher photosensitivity and photoresponsivity than that with the structure n+-Si/SiO2/PdPc/C60/Al(S&D) (PdPc/C60-OFET). The origin for this result is the high mobility of C60 and the well-matched LUMO levels between PdPc and C60. The maximum photosensitivity and the photoresponsivity of the C60/PdPc-OFET are 3×103 and 11 mA/W while those of PdPc/C60-OFET are 2×103 and 3 mA/W under the light source with a power density of 100 mW/cm2 and emission centered at 655 nm.关键词：photoresponsive organic field-effect transistors;palladium phthalocyanine;C60;heterojunction151|124|0更新时间：2020-08-12
- 摘要：One of the factors restricting the appliance of high-efficiency passivated emitter and rear cell(PERC)-type solar cell to the industrial silicon solar cell is that the formation of good ohmic contacts on the rear side of PERC-type solar cell passivated by Al2O3 film. This work focuses on the formation of rear local contacts instead of high efficiency by using laser ablation with 532 nm wavelength and conventional photolithographic technique. The results of the contact formed by these two methods are compared and analyzed. In addition, we compare and analyze the rear local contacts formed by laser ablation and laser firing using 532 nm line laser. The results suggest that the laser ablation can provide better contacts in the PERC-type solar cell. The contact resistance of the solar cell using laser ablation technique is reduced to 1.24 Ω·cm2 from 10.7 Ω·cm2 using laser firing method, and the efficiency is enhanced from 4.2% to 10.7%.关键词：crystalline silicon solar cells;Al2O3;local contacts;laser ablation;laser fired contact174|109|0更新时间：2020-08-12
- 摘要：Aerosol scattering characteristic is very important for atmospheric radiation and climate research. In order to study the aerosol particles scattering properties in different relative humidity, we firstly got the humidity polarization model based on the Mie scattering theory, then compared and analyzed the polarization properties of single particle and particle cluster of three aerosols in different humidity conditions. The results show that relative humidity have regularity impact on the polarization properties of aerosol particles, especially in the area between 120° to 150°. It means that the scattering light polarization degree of some backward scattering angel can effectively reflect the relative humidity's change of aerosol particles.关键词：polarization optics;relative humidity;aerosol;particles cluster;Mie scatting210|143|13更新时间：2020-08-12
- 摘要：Based on Silicon on insulator(SOI) material and mature Micro-electro-mechanical systems (MEMS) technology, an optical waveguide cascaded resonator filter with high integration and small size was processed. The light field transmission characteristics and spectral response characteristics of multi-ring cascaded cavity were theoretically analyzed. Moreover, the relationship between different number of cascaded micro-ring and resonance spectrum roll-off verticality was also proved in experiment. When the waveguide width is 450 nm and radius is 5 μm, the experimental results show that -3 dB response bandwidth of the 1st order, 2nd order and 10th order filters spectral are 0.313, 0.279 and 0.239 nm,which are consistent with the theoretical results. That means more cascaded rings result in flatter top resonance and higher roll-off vertical degree. Micro-ring and racetrack-shaped cascaded resonator filters were fabricated and the properties of transmission spectrum was also tested.关键词：optical waveguide;multi-ring cascaded;filters;roll-off vertical150|347|1更新时间：2020-08-12
- 摘要：Based on the phenomenon that glycoprotein can obviously inhibit the chemical luminescence (CL) signal of luminol-H2O2 system, luminol-pyrogallol-sodium hydroxide system and luminol-H2O2-copper sulfate system in basic medium, a simple and rapid chemiluminescence method int egrated with microwell plate was developed for evaluating of the scavenge effects of glycoprotein of Rubus chingii Hu. on hydrogen peroxide (H2O2), superoxide anion (O2-) and hydroxyl radical (·OH). The experiment data indicated the proposed method described in this paper has proved to be fairly simple, reproducible and rapid and would be a valuable tool for fast screening of antioxidant activity of herbal.关键词：microwell plate;chemiluminescence method;Rubus chingii Hu.;glycoprotein;antioxidant activity126|76|2更新时间：2020-08-12
- 摘要：Electro-optical countermeasures system includes four kinds of interference patterns that are the smokescreen passive, laser angle deception, laser blocking, and laser suppression. Based on these interference patterns, the photoelectric confrontation simulation system is established to confront the weather vane laser-guided bombs. The process of system simulation is described, and the mathematical models of laser propagation, smoke transmission, seeker signal processing, jamming calculation, bomb control and movement modules are mainly investigated, and then simulation experiments and data analysis are performed. According to the simulation results, the main factors that affect the interference effect of various interference manners are analyzed. Furthermore, influencing factors are divided into two types: transient and gradually-varied, and then the characteristics of the influence on interference effects are simultaneously analyzed. In addition, the simulation system has been applied in the semi-physical simulation project, and it can also provide both reference and basis for the analysis and evaluation of the photoelectric confrontation efficiency.关键词：laser-guided;laser atmospheric propagation;seeker;jamming144|408|4更新时间：2020-08-12
- 摘要：The principle of 3×3 fiber coupler output demodulation is introduced, and its mathematical expression is derived. The demodulation frequency range of its algorithm is exploited. The effects from interference signals, asymmetry of coupler and higher harmonic on demodulation result are analyzed. The results show that this method has a wide range of frequency demodulation, and can avoid the interference of outside factors such as temperature, and eliminate the effects which are from deviation of three output sides of 3×3 coupler on demodulation and higher harmonic. It has advantages of stable performance, carrier and stable working point not needed, and strong anti-jamming capability, etc. So it has well practicability, feasibility and theoretical guidance meaning for digital demodulation circuit design.关键词：optical fiber sensor;3×3 coupler;interferometer;signal;demodulation154|37|10更新时间：2020-08-12
- 摘要：Laser-induced breakdown spectroscopy (LIBS) has attracted increasing interest and is widely used for routine elemental analysis. In order to enable LIBS to detect complete spectral information within a quite short time, a small size echelle spectrograph with spectral coverage from 180~400 nm was designed. According to the analysis of the optical system, the parameters are calculated and the aberrations are corrected well. In this way, this echelle spectrograph can obtain two-dimension spectral graph with high resolution quickly. By testing and calibrating the Hg lamp, the actual resolution gets up to 0.036 8 nm at 253.652 nm which can satisfy the analysis requirement of LIBS.关键词：laser-induced breakdown spectroscopy;LIBS;echelle spectrograph;echelle grating92|79|0更新时间：2020-08-12
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