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InP quantum dots-based electroluminescent devices

Chinese Physics B 2019年第11期28卷 18-24页

作者： Qianqian Wu Fan Cao Lingmei Kong Xuyong Yang School of Material Science and Engineering Shanghai UniversityShanghai 200072China Key Laboratory of Advanced Display and System Applications of Ministry of Education Shanghai UniversityShanghai 200072China

Indium phosphide(InP) quantum dots(QDs) have shown great potential to replace the widely applied toxic cadmiumcontaining and lead perovskite QDs due to their similar emission wavelength range and emission peak width but without intrinsic toxicity. Recently, electrically driven red and green InP-based quantum-dot light-emitting diodes(QLEDs) have achieved great progress in external quantum efficiency(EQE), reaching up to 12.2% and 6.3%, respectively. Despite the relatively poor device performance comparing with cadmium selenide(CdSe)-and perovskite-based QLEDs, these encouraging facts with unique environmental friendliness and solution-processability foreshadow the enormous potential of InP-based QLEDs for energy-efficient, high-color-quality thin-film display and solid-state lighting applications. In this article, recent advances in the research of the InP-based QLEDs have been discussed, with the main focus on device structure selection and interface research, as well as our outlook for on-going strategies of high-efficiency InP-based QLEDs.

关键词： indium phosphide quantum dots light-emitting diodes external quantum efficiency

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Hydrothermal synthesis of uniform CdWO4:Eu^3+microrods as single component for UV-based WLEDs

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Journal of Rare Earths 2016年第12期34卷 1179-1187页

作者：雷芳殷录桥施鹰谢建军章蕾范灵聪 School of Materials Science and Enggineering Shanghai UniversityShanghai 200444China Key Laboratory of Advanced Display and System Applications Ministry of EducationShanghai UniversityShanghai 200072China

A series of single-composition emission-tunable CdWO4：Eu^3＋ uniform size nanorods were synthesized by polyvinylpyrrolidone（PVP） assisted hydrothermal process. The products were measured by powder X-ray diffraction（PXRD）, scanning electron microscopy（SEM）, transmission electron microscopy（TEM）, photoluminescence, and fluorescent decay test. The results showed that reaction time, temperature, p H values and Eu^3＋ doped concentration played important roles in determining the morphologies and photoluminescent properties. And we also investigated its use in Ga N LED, warm-white-light could be obtained by the combination of the bright blue light originated from the charge transfer transition in the tungstate groups and the near UV light from LED chip with the red emission from 4f-4f transition of Eu^3＋, respectively. By properly tuning the doping concentration of Eu^3＋, chromaticity coordinates（0.30 0.22） could be achieved under the 380 nm excitation and its color rendering index was 80.6. So it has potential application in warm-WLED and replacing the commercial YAG：Ce phosphor which absence of red band emission.

关键词： CdWO4:Eu3+ hydrothermal synthesis WLED photoluminescence single-component rare earths

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Estimation of electron mobility of n-doped 4,7-diphenyl-1,10-phenanthroline using space-charge-limited currents

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Journal of Semiconductors 2009年第11期30卷 63-66页

作者：希扎尔.乌尔.哈克鲁富翰蒋雪茵张志林张小文张良李俊 School of Materials Science and Engineering Shanghai University Key Laboratories of Advanced Display and System Applications Ministry of EducationShanghai University

The electron mobilities of 4, 7-diphenyl-1, 10-phenanthroline （BPhen） doped 8-hydroxyquinolinatolithium （Liq） at various thicknesses （50-300 nm） have been estimated by using space-charge-limited current measurements. It is observed that the electron mobility of 33 wt% Liq doped BPhen approaches its true value when the thickness is more than 200 rim. The electron mobility of 33 wt% Liq doped BPhen at 300 nm is found to be -5.2 × 10^-3 cm^2/（V.s）（at 0.3 MV/cm） with weak dependence on electric field, which is about one order of magnitude higher than that of pristine BPhen （3.4 × 10^-4 cm^2/（V.s）） measured by SCLC. For the typical thickness of organic light-emitting devices, the electron mobility of doped BPhen is also investigated.

关键词： doping electron mobility SCLC 8-hydroxyquinolinonate-lithium (Liq)

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Numerical differentiation of noisy data with local optimum by data segmentation

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Journal of systems Engineering and Electronics 2015年第4期26卷 868-876页

作者： Jianhua Zhang Xiufu Que Wei Chen Yuanhao Huang Lianqiao Yang Key Laboratory of Advanced Display and System Applications (Shanghai University) Ministry of Education School of Mechanical & Electronic Engineering and Automation Shanghai University

A new numerical differentiation method with local opti- mum by data segmentation is proposed. The segmentation of data is based on the second derivatives computed by a Fourier devel- opment method. A filtering process is used to achieve acceptable segmentation. Numerical results are presented by using the data segmentation method, compared with the regularization method. For further investigation, the proposed algorithm is applied to the resistance capacitance （RC） networks identification problem, and improvements of the result are obtained by using this algorithm.

关键词： numerical differentiation noisy data local optimum,data segmentation.

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Wigner-Ville distribution and cross Wigner-Ville distribution of noisy signals

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Journal of systems Engineering and Electronics 2008年第5期19卷 1053-1057页

作者： Chen Guanghua Ma Shiwei Liu Ming Zhu Jingming Zeng Weimin Key Laboratory of Advanced Display and System Applications Ministry of Education & Microelectronic Research and Development Center Shanghai Univ. Shanghai 200072 P. R. China

The Wigner-Ville distribution （WVD） and the cross Wigner-Ville distribution （XWVD） have been shown to be efficient in the estimation of instantaneous frequency （IF）. But the statistical result of the IF estimation from XWVD peak is much better than using WVD peak. The reason is given from a statistical point of view. Theoretical studies show that XWVD of the analyzed signal can be estimated from XWVD of the noise-contaminated signal. The estimation is unbiased, and the variance is equal to that of noise. In this case, WVD cannot be estimated from W-VD of the noise-contaminated signal. Therefore, higher SNR is required when WVD is used to analyze signals.

关键词： Wigner-Ville distribution cross Wigner-Ville distribution instantaneous frequency expectation variance.

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Influence of thermal annealing-induced molecular aggregation on film properties and photovoltaic performance of bulk heterojunction solar cells based on a squaraine dye

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Frontiers of Materials Science 2018年第2期12卷 139-146页

作者： Pengpeng ZHANG Zhitian LING Guo CHEN Bin WEI School of Materials Science and Engineering Shanghai University Shanghai 200072 China Key Laboratory of Advanced Display and System Applications (Ministry of Education) Shanghai University Shanghai 200072 China

Squaraine （SQ） dyes have been considered as efficient photoactive materials for organic solar cells. In this work, we purposely controlled the molecular aggregation of an SQ dye, 2,4-bis[4-（N,N-dibutylamino）-2-dihydroxyphenyl] SQ （DBSQ- （OH）2） in the DBSQ（OH）2：[6,6]-phenyl-Cel-butyric acid methyl ester （PCBM） blend film by using the thermal annealing method, to study the influence of the molecular aggregation on film properties as well as the photovoltaic performance of DBSQ（OH）2：PCBM-based bulk heterojunction （BHJ） solar cells. Our results demonstrate that thermal annealing may change the aggregation behavior of DBSQ（OH）2 in the DBSQ（OH）2：PCBM film, and thus significantly influence the surface morphology, optical and electrical properties of the blend film, as well as the photovoltaic performance of DBSQ（OH）2：PCBM BHJ cells.

关键词： organic solar cells squaraine dye molecular aggregation film properties power conversion efficiency

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Analysis of Strain Distribution and Sensitivity Improvement of Optical Fiber Coils in Disc Optical Fiber Accelerometers

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Journal of Lightwave Technology 2025年

作者： Mo, Haohao Wen, Kunhua Yang, Jun Ping, Xinyang An, Ran Wang, Shun Xu, Pengbai Yu, Zhangjun Wang, Yuncai Qin, Yuwen Guangdong University of Technology School of Physics and Optoelectronic Engineering Guangzhou510006 China Ministry of Education of China Guangdong University of Technology Key Laboratory of Photonic Technology for Integrated Sensing and Communication Guangzhou510006 China Guangdong University of Technology Guangdong Provincial Key Laboratory of Information Photonics Technology Guangzhou510006 China Guangdong University of Technology Guangdong Provincial Key Laboratory of Sensing Physics and System Integration Applications Guangzhou510006 China Guangdong University of Technology Institute of Advanced Photonic Technology the School of Information Engineering Guangzhou510006 China Ministry Education of China Harbin Engineering University Key Lab of In-fiber Integrated Optics Harbin150001 China Harbin Engineering University College of Physics and Optoelectronic Engineering Harbin150001 China

Multi-turn optical fiber coils, as the key sensing components of Fiber Optic Disc Accelerometers (FODAs), significantly affect the FODA performances due to their layered structure. This paper explores the strain distribution characteristics of the optical fiber coils by utilizing the inherent properties of the FODA, supported by Finite Element Method (FEM) and high-precision Optical Frequency Domain Reflectometry (OFDR). The results indicate that the simulation outcomes are largely consistent with the OFDR measurements, accurately reflecting the strain distribution within the optical fiber coils of the FODA. This analysis dose not requires additional external force application devices and carries no risk of damaging the FODA. Based on FEM, the simulation model is employed to optimize the existing structure, proposing a multi-turn optical fiber coil fabricated from ultra-fine diameter fiber. By altering the structure of optical fiber coil to make the internal strain distribution trend uniform, the sensitivity of the FODA is increased to approximately 150% of its original value. © 2025 IEEE. All rights reserved.

关键词： Frequency domain analysis

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Optimizing structure for constructing a highly efficient inverted top-emitting organic light-emitting diode with stable electroluminescent spectra

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Journal of Semiconductors 2014年第2期35卷 24-27页

作者：张小文许积文王华魏斌曾华荣蒋雪茵张志林 Guangxi Key Laboratory of Information Materials Guilin University of Electronic Technology Key Laboratory of Advanced Display and System Applications Ministry of EducationShanghai University Key Laboratory of Inorganic Functional Materials and Devices Shanghai Institute of CeramicsChinese Academy of Sciences

We demonstrate a highly efficient inverted top-emitting organic light-emitting diode （TOLED） having stable electroluminescent spectra and color coordination with variation of viewing angles by simply tuning the reso- nance wavelength corresponding to the free emission of the emitter. Using a doped fluorescent emitting system, the inverted TOLED exhibits an enhanced maximum current efficiency of 19 cd/A and a power efficiency of 17 lm/W, which are much higher than those （11 cd/A and 5 lm/W） of the counterpart with normal structure, although both TOLEDs behave with similar stable electroluminescent spectra characteristics. The results indicate that we provide a simple and effective method of constructing an excellent inverted TOLED for potentially practical applications.

关键词： OLED inverted structure stable electroluminescent spectrum microcavity effect

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Recent advances in ocular lubrication

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Friction 2024年第9期12卷 1929-1954页

作者： Jianhua ZHANG Yunjuan SU Jian WU Hongdong WANG School of Mechatronic Engineering and Automation and Key Laboratory of Advanced Display and System Application Ministry of EducationShanghai UniversityShanghai 200444China

The ocular lubrication,where the eyelid constantly slides on the curved corneal surface,is considered as one of primary lubrication systems in *** reliable lubrication conditions,sensitive ocular tissues remain intact from fatigue damage during spontaneous blink *** tear film,evenly filled between cornea and conjunctiva,is a biological fluid with dynamic adjustment ability,which provides superior lubrication with the friction coefficient of below ***,the lubrication failure may result in a variety of uncomfortable symptoms such as inflammatory reactions,tissue damage and neurological ***,it is essential to clarify the fundamental mechanism of ocular lubrication,which helps to alleviate and even recover from various ocular *** review firstly demonstrates that the ocular components,containing lipids and mucins,contribute to maintaining the lubrication stability of tear ***,the ocular lubrication state in various physiological environments and the physical effect on tear film dynamics are further *** typical applications,the therapeutic agents of dry eye syndrome and contact lens with superior lubrication effects are introduced and their lubrication mechanisms are ***,this review summarizes a series of the latest research inspired by ocular ***,this work will provide a valuable guidance on the theoretical research and extensive applications in the field of biological lubrication.

关键词： bio-tribology ocular lubrication tear film dry eye syndrome tear film dynamics

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Influence of substrate temperature on the performance of zinc oxide thin film transistor

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Journal of Semiconductors 2011年第4期32卷 57-61页

作者：马军伟冉峰徐美华计慧杰 School of Mechatronical Engineering and Automation Shanghai University Key Laboratory of Advanced Display and System Application Ministry of EducationShanghai University

Top-contact thin film transistors（TFTs） using radio frequency（RP） magnetron sputtering zinc oxide （ZnO） and silicon dioxide（SiO;） films as the active channel layer and gate insulator layer,respectively,were *** performances of ZnO TFTs with different ZnO film deposition temperatures（room temperature, 100℃and 200℃） were *** with the transistor with room-temperature deposited ZnO films, the mobility of the device fabricated at 200℃is improved by 94%and the threshold voltage shift is reduced from 18 to 3 V（after 1 h positive gate voltage stress）.Experimental results indicate that substrate temperature plays an important role in enhancing the field effect mobility,sharping the subthreshold swing and improving the bias stability of the *** force microscopy was used to investigate the ZnO film *** reasons for the device performance improvement are discussed.

关键词： ZnO-TFT bias stability substrate heat RF magnetron sputtering

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