最新刊期
卷 41 ， 期 7 ， 2020
- 摘要：Organic-inorganic hybrid perovskites(OIHPs) are one of the most novel optoelectronic hybrid materials at present. They have been widely studied in the fields of solar cells and light emitting devices. Nevertheless, these materials have been demonstrated to exhibit relatively stronger spin-orbit coupling(SOC) and Rashba effect, as well as larger carrier mobilities and extinction coefficients. Thus, these form important bases for realizing spin injection and spin manipulation. Herein, spin-optoelectronics of OIHPs will be discussed by three aspects. First, the spin-polarized electronic transport and ferromagnetic-OIHPs spinterfaces are introduced. Then, magnetic field effects of OIHPs at excited states are given. Finally, the future development of OIHPs in the spin-optoelectronics is deeply discussed and commented.关键词：organic-inorganic hybrid perovskites;Rashba effect;spin-transport;spinterfaces;magnetic field effects407|541|0更新时间：2020-09-10
Invited Review
- 摘要：Rare earth supramolecular systems have received increasing attention recently, due to their unique structural features and excellent luminescent properties. We present here a short review on the history of mononuclear rare earth complexes and the current achievements of polynuclear rare earth supramolecular systems, respectively. By looking into the future challenges and opportunities, we look forward to the booming development of this young field.关键词：lanthanide luminescence;supramolecular;multi-component;coordination complex337|228|1更新时间：2020-09-10
40th Anniversary Special Column——Young Scientist on The Road
- 摘要：In recent years, metal halide perovskites have become new promising materials in the field of optoelectronic applications due to the advantages of high optical absorption coefficient, high color purity, wide color gamut, continuously adjustable luminescence wavelength, high photoluminescence quantum yield, large carrier diffusion length, stable ingredients and not easy to decompose, and have excellent performance in solar cells, light-emitting diodes, memristors, lasers, photodetectors and anti-counterfeiting labels. Furthermore, perovskites can be made by simple methods like solution synthesis, which provides the possibility of combining it with the printing process, large-scale production and industrialization. In this experiment, solution-processed CsPbBr3 perovskite films grown in situ have a preferred orientation on the (100) crystal plane, and its interplanar spacing is smaller than the value from PDF standard card. As the concentration of precursor increases, the morphological structure of samples varied, continuity and compactness of films were improved, crystal grains were refined, the photoluminescence(PL) intensity excited by light at 375 nm was approximately 5 times original, the PL peak position blue shifted by 6 nm, and the lattice distortion caused by this process increased the full width at half maximum(FWHM) of the PL spectrum by more than 2 nm.关键词：perovskite;in situ growth;structure characteristics;luminescence characteristics;precursor concentration368|405|2更新时间：2020-09-10
- 摘要：Through structural transition method or in-situ assembly method, two semi-flexible π-conjugated unsaturated bipodal-ligands were coordinated with CuI to obtain 2-D or 3-D cuprous iodide coordination polymerizations with the general structure of {[CuIL]·solvents}n, namely Cu-3 and Cu-4, respectively. The structural information of Cu-3 and Cu-4 was determined by X-ray single crystal diffraction, powder X-ray diffraction and elemental analysis. Studying the photophysical properties of these two coordination polymers revealed that when excited by ultraviolet light, Cu-3 and Cu-4 showed a single emission peak with blue-green light at 513 nm and yellow light at 555 nm, respectively, which were attributed to halogen to ligand charge transfer (3XLCT) state. At the same time, these two coordination polymers both exhibit two-photon excited luminescence properties, and are expected to be used in the field of biological imaging.关键词：cuprous iodide;coordination polymer;XLCT;two-photon luminescence272|330|0更新时间：2020-09-10
- 摘要：Hypochlorous acid (HOCl) is a reactive oxygen species produced by hydrogen peroxide and chloride ions under the catalysis of myeloperoxidase (MPO). HOCl plays an important role in immune defense against pathogens. Therefore, it is of great significance to sense and detect HOCl. There are several methods for the detection of HOCl, such as electroanalysis, chromatography, chemiluminescence and fluorescence analysis and so on. Currently, fluorescence imaging technique has attracted many researchers' interest because of its advantages, including high selectivity and sensitivity, easy operation, quick response, and real-time detection. In this paper, a methylene blue-based near-infrared fluorescence probeMB-1 was designed and synthesized for the fast and specific detection of HOCl. The probe can specifically detect HOCl in vitro, accompanied by a significant enhancement of near-infrared fluorescence intensity and a remarkable colour change from colorless to blue. Moreover, the probe displayed high sensitivity towards HOCl and limit of detection (LOD) was as low as 8.2 nmol/L. In addition, the probe showed good anti-interference ability, indicating that it has the potential to detect HOCl at a physiological level.关键词：hypochlorous acid;fluorescent probes;reactive oxygen species;methylene blue;near-infrared275|255|2更新时间：2020-09-10
- 摘要：(Sr0.96, Eu0.04)LiAl3N4 red phosphor for high color rendering LED was prepared using Sr3N2, Eu2O3, AlN and Li3N as raw materials by high pressure nitrogenize sintering method. The effects of Sr3N2 proportions and different fluxes on morphology and luminescence properties of phosphors were analyzed by scanning electron microscope(SEM), X-ray diffraction(XRD), excitation and emission spectrum. XRD patterns and XRD Rietveld refinement showed that the 1.3 times Sr3N2 material has better luminescent intensity and more pure phase state. The influence of the chlorides and fluorides fluxes on the morphology and luminescent properties was also discussed. NH4F and LiCl had better fluxing effect and they were selected as mixed fluxes. The effects of different proportions of the mixed fluxes on the luminescent properties of the phosphors were studied in detail. The experimental results showed that the phosphor had the better particle morphology and the luminescent intensity was increased by nearly 4 times when the combination ratio of NH4F and LiCl was 1:1. White LED(4 000 K) was prepared by combining with (Sr0.96, Eu0.04)LiAl3N4 and GAG535 green phosphor and the results indicated that this LED has higher luminous efficiency and higher Ra, which was more suitable for high color rendering index white LED.关键词：high color rendition;red phosphor;flux155|94|0更新时间：2020-09-10
- 摘要：A series of bisthiophene derivatives were synthesized by Suzuki coupling reaction, in which bromine atoms on bisthiophene raw materials were substituted with different groups: 3-(5'-bromo-[2, 2-bisthiophene]-5-yl)pyridine(C13H8BrNS2, Mr=322.24, compound Dt-1), 5, 5-bis(pyridine-3)-yl)-2, 2-bisthiophene(C18H12N2S2, Mr=320.43, compound Dt-2), 5-(3, 5-bis (trifluoromethyl)phenyl) -2, 2-bisthiophene(C16H8F6S2, Mr=378.35, compound Dt-3), 5, 5-bis(3, 4, 5-trifluoro-phenyl)-2, 2-bithiophene(C 20H8F6S2, Mr=426.39, compound Dt-4). The structures were characterized by infrared spectroscopy(IR), mass spectrometry(MS), nuclear magnetic resonance spectroscopy(1H NMR) and single crystal X-ray diffraction. The luminescence properties were studied by UV-Vis absorption spectroscopy and fluorescence spectroscopy. The results showed that compound Dt-1 had strong fluorescence emission ranging from 390 nm to 470 nm under the excitation light of 349 nm in CH2Cl2 solution, and the two largest emission peaks are 403 nm and 422 nm, respectively. Compound Dt-2 showed strong fluorescence emission in the 400－480 nm region under the excitation light of 372 nm with two maximum emission peaks at 430 nm and 440 nm. Compound Dt-3 exhibited the strongest fluorescence emission at 418 nm under excitation light of 350 nm and compound Dt-4 presented the strongest fluorescence emission at 436 nm under 371 nm excitation light. Due to the introduction of electron-withdrawing/donating groups in the conjugated structure of bisthiophene, the mobility and conjugation degree of π electrons are increased, and the intermolecular interaction force is enhanced. Energy loss caused by vibration relaxation phenomenon and Stokes shift leads to the shifts of the maximum absorption peaks to the long wave direction.关键词：bisthiophene derivative;synthesis;crystal structures;spectral properties197|210|0更新时间：2020-09-10
Synthesis and Properties of Materials
- 摘要：High quality LiYF4(LYF) single crystals in big size doped with Tm3+ in 0.8% and 1.3% concentrations were grown by Bridgman method. The absorption spectra and emission spectra were measured. The maximum absorption cross section and maximum emission cross section of3F4 level were calculated to be 0.25×10-20 cm2 and 0.33×10-20 cm2, respectively. The laser output of Tm3+ doped LYF crystals in the ~2.0 μm band was carried out by using short flat-flat cavity taking 796 nm semiconductor laser as pumping source. A maximum CW output of 1.88 W at an absorbed pump power of 3.4 W was achieved from the Tm3+ doped LYF single crystal, and the corresponding conversion efficiency and slope efficiency for the laser output were 51% and 57%, respectively. A Tm-doped LYF single crystal was pumped using a semiconductor saturable absorption mirror, and its operation in a ~2.0 μm band CW laser was tested. When the maximum pump power is 3.5 W, the maximum average output power of the mode-locked laser is 200 mW. At this time, the mode-locked pulse width is about 20 ps, the corresponding repetition frequency is 63.86 MHz, and the center line is 1.88 μm. The results show that the Tm-doped LYF single crystal is a ~2 μm band ultrafast laser crystal with good physical properties.关键词：thulium ion;2.0 μm;continuous-wave (CW);continuous-wave (CW) mode-locked285|193|1更新时间：2020-09-10
- 摘要：Hydrogen peroxide(H2O2) is the main marker of reactive oxygen species and closely related to various diseases such as neurodegenerative diseases. In this work, we presented an enzymatic nanosensor for fluorescence sensing of intracellular hydrogen peroxide. The nanosensor consisted of a biocompatible shell of poly-l-lysine and horseradish peroxidase(HRP), and an oxygen sensing core from a porous polymeric matrix containing oxygen probes. H2O2 was catalyzed by HRP to yield the product of oxygen, which was reported by the sensing core in the form of quenched fluorescence. The enzymatic nanosensors had a hydrodynamic size of about 270 nm, a zeta potential of -18 mV and good biocompatibility. Their fluorescence were highly sensitive to H2O2 in both ratiometric and the time-resolved fluorescence. Moreover, the nanosensors can be efficiently internalized by live cells, thereby intracelluar H2O2 was sensitively detected with TRF modality. These results suggest that our enzymatic nanosensors may be used for monitoring H2O2-related cellular events, such as oxidative stress.关键词：H2O2;nanosensor;time-resolved fluorescence (TRF);ratiometric fluorescence;oxidative stress178|228|0更新时间：2020-09-10
- 摘要：In this paper, a MOS-like silicon light-emitting device is designed and fabricated under 0.18 μm standard CMOS technology. The device consists of two identical PMOS in the same n-well, and uses the p+n junctions formed between p+ source/drain region and n-well for avalanche breakdown to emit visible light. The measurement results indicate that the device has a turn-on voltage of 0.8 V at forward bias, and avalanche breakdown at reverse bias voltage of 6 V, which can emit yellow visible light with spectrum of 420-780 nm. By comparing the measurement results of two MOS-like silicon LEDs with different light window widths of 0.5 μm and 2 μm, it is found that the silicon LED with smaller light window has higher luminescent intensity and better uniformity, which is related to the distribution of reverse current density and the light reflection between metal electrodes. The research of this paper has attractive application in silicon-based optoelectronic integrated circuits on chip.关键词：silicon light-emitting device;CMOS process;light window196|201|0更新时间：2020-09-10
- 摘要：The high-power thulium(Tm3+)doped fiber laser(TDFL) based on the structure of master oscillator power-amplifier is the main type of 2 μm band high-power fiber lasers. Study on thermal effect management of the thulium doped fiber amplifier(TDFA) stage means a lot to the continuously power-scaling of the TDFL. This paper mainly focuses on the theoretical research on the optimization of the pumping method of TDFA for thermal effect management. We use the Runge-Kutta method and Newton iteration method to solve the steady-state rate equation of TDFA under different pumping methods. And, on the basis of the heat conduction equation, the temperature distributions of Tm3+ doped fiber(Thulium-doped fiber, TDF) along the radial and axial direction are simulated. Combining with the genetic algorithm theory, the segmentally pumping method is studied. Through optimizing of the relative parameters, using a 2 020 nm input signal light with a power of 5 W, a total 793 nm laser pump power of 1 000 W and a TDF with an absorption coefficient of 3.1 dB/m and a total length of 11 m which is divided into 5 segments(2.4, 2, 2, 2, 2.6 m), we obtained an amplified signal laser with an output power of 284.5 W and a slope efficiency of 28.45%, and the maximum temperature at the outer cladding boundary of the TDF is only 86.28 ℃ with a uniform temperature distribution along the whole fiber. Compared with a TDFA using traditional forward pumping or dual-end pumping mode, the thermal effect has been significantly improved.关键词：thulium-doped fiber amplifier;thermal effect management;segmented pump;genetic algorithm295|180|2更新时间：2020-09-10
- 摘要：The influence of cell/encapsulant interface optical properties of active and non-active areas on Cu(InGa)Se2 PV module short-circuit current was studied by simulation based on measurement data. The absorption and reflection inside the module were analyzed according to the simulation of models established based on Cu(InGa)Se2 module structure. It reveals that the reflection of TCO/encapsulant interface is not negligible in active area. So, MgO as the anti-reflection coating is proposed. The relation between first reflection angle and the second reflectivity was simulated in non-active area. Based on this, the influences of reflector inclination and the ratio of specular/diffuse reflection on light utilization were analyzed. The simulation results show that the MgO anti-reflection coating in active area reduces the interface reflection for over 1% and the light in non-active area could be utilized for over 50% by preparing reflection structure in non-active area, theoretically.关键词：Cu (In, Ga) Se2 thin film solar module;simulation;interface reflection;light management160|133|0更新时间：2020-09-10
- 摘要：A blue light emitting diode(LED) chip has been fabricated on a 4-inch patterned sapphire substrate with an InGaN/GaN multiple quantum well structure. It has also been combined with a yttrium aluminum garnet yellow phosphor(YAG:Ce3+) to be packaged into a white LED device. In this study, its epitaxial growth, chip process and packaging process have been briefly described. Some material property and device performance have been characterized. The surface of the epitaxial wafer has a good morphology. The photoluminescence(PL) spectrum of the blue epitaxial wafer shows a peak wavelength of 442 nm. Basing on the electrical characteristics of the packaged white light chip, the threshold and current-limit voltages are 2.7 V and 3.6 V, respectively. In addition, the electroluminescence(EL) spectra contain two main peaks with one at 440 nm of blue light and the other one at 540 nm of yellow-green light. With the increase of the injection current, the blue peak varies from blue-shift to red-shift, and the yellow-green varies from red-shift to blue-shift and then red-shift. It is believed that the related chip fabrication and characterization technology would play a certain role in the research for promoting on solid-state lighting field.关键词：GaN;YAG phosphor;white LED;characterization and performance209|173|0更新时间：2020-09-10
Device Fabrication and Physics
- 摘要：Fluorescent silicon quantum dots(SiQDs) were prepared by hydrothermal reaction method. The morphology and fluorescence properties of SiQDs were investigated by transmission electron microscopy(TEM), Fourier transform infrared spectroscopy(FTIR), X-ray photoelectron spectroscopy(XPS), photoluminescence(PL) excitation and emission spectra and excited-state decay curve. By lettuce cultivation experiment, the effect of SiQDs as foliar light fertilizer to improve light energy utilization of lettuce was studied. TEM image showed that the average size of the SiQDs is 3.6 nm with the uniform size. These results of FTIR and XPS demonstrated abundant oxygen-containing functional groups on SiQDs surface, which contributed to its excellent water dispersibility. The PL spectrum of SiQDs demonstrated that the optimal emission of the SiQDs is 450 nm when excited at 385 nm, which is also independent of excitation wavelength. When combined with chloroplast(CLP) in vitro, the PL intensity of the SiQDs decreased, but the PL lifetime did not change significantly. Furthermore, reduction rate of 2, 6-dichlorophenolindophenol(DCPIP) in this combined system was increased. All these results above reveal that inner-filtration effect happens in SiQDs/CLP combined system. CLP can absorb the blue light emitted from SiQDs for photosynthesis to increase the total yield of fresh and dry weight of lettuce significantly. The chlorophyll fluorescence imaging results further demonstrated the increased maximum photosynthetic rate关键词：fluorescent silicon quantum dot;foliar light fertilizer;inner-filter effect;utilization of light energy420|670|1更新时间：2020-09-10
- 摘要：It is an important method to obtain high intensity and broadband terahertz (THz) wave utilizing gas plasma excited by two-color laser pulses, and this paper has studied the influence of laser energy on THz radiation in the method on the basis of the transient photocurrent model. Theoretical calculation proves that THz wave will increase with the increase of laser energy, but the distribution of THz spectrum will not change with the variation of laser energy. Furthermore, the reason of laser energy affecting THz wove is analyzed, and the physical mechanism of this influence is explained by calculating the free electrons centration and drift current density. This study provides an effective way to improve the intensity of THz radiation.关键词：femtosecond laser pulse;terahertz wave;gas plasma;photocurrent model221|198|0更新时间：2020-09-10
Luminescence Applications and Interdisciplinary Fields
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