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P-13.2: AMOLED Encapsulation technology and Prospect

SID Symposium Digest of Technical Papers 2018年第S1期49卷

作者： Wei Ao Chunhong Li Yan Wang Xiangchao Liu Xiaogang Xin Feng Gao Chaochi Peng Jianhua Zhang Key Laboratory of Advanced Display and System Application Ministry of Education Shanghai University Shanghai 200072 China Kunshan Govisionox Optoelectronics Co. LTD (GVO) Kunshan 215300 Jiangsu P.R. China

The flexible organic light emitting diodes (OLEDs) has attracted a lot of attention because of its very wide and promising application prospect. The flexible encapsulation is a most problem for mass production of flexible OLEDs since their sensitivity to water and oxygen. Traditional flexible encapsulation using plasma enhanced chemical vapor deposition (PECVD) film as the inorganic layer. However owing to the complicated pattern of sub-layer and particles, the poor step coverage of PECVD film results in bad encapsulation properties. Therefore the plasma enhanced atomic layer deposition (PEALD) is studied on account of its better step coverage and lower growth temperature. Firstly, the PECVD SiNx process has been researched to achieve the low water vapor transmission rate (WVTR) (WVTR<5*10-4g m-2day-1) and low stress (<-300MPa). Then we design several flexible encapsulation films with multilayer structures. The PEALD SiOx film is critical in the multilayer encapsulation films to obtain flexible OLED devices with the best air-stability . Through evaluation of the pass rate after 60oC 90% RH and 85 oC 85% RH for 240h, best structure of flexible encapsulation films has been selected and used in our product.

关键词： PEALD PECVD Encapsulation Flexible

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Photocatalysis: Light-Activated Rapid Disinfection by Accelerated Charge Transfer in Red Phosphorus/ZnO Heterointerface (Small Methods 3/2019)

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Small Methods 2019年第3期3卷

作者： Jun Li Xiangmei Liu Lei Tan Yanqin Liang Zhenduo Cui Xianjin Yang Shengli Zhu Zhaoyang Li Yufeng Zheng Kelvin Wai Kwok Yeung Xianbao Wang Shuilin Wu School of Materials Science & Engineering The Key Laboratory of Advanced Ceramics and Machining Technology by the Ministry of Education of China Tianjin University Tianjin 300072 China Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials Ministry-of-Education Key Laboratory for the Green Preparation and Application of Functional Materials Hubei Key Laboratory of Polymer Materials School of Materials Science & Engineering Hubei University Wuhan 430062 China State Key Laboratory for Turbulence and Complex System and Department of Materials Science and Engineering College of Engineering Peking University Beijing 100871 China Department of Orthopaedics & Traumatology Li Ka Shing Faculty of Medicine The University of Hong Kong Pokfulam Hong Kong 999077 China

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High-brightness blue organic light emitting diodes with different types of guest-host systems

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Optoelectronics Letters 2016年第2期12卷 89-92页

作者：王肖张敬爽彭翠云郭坤平魏斌张浩 School of Materials Science and Engineering Shanghai University Shanghai 200072 China Langfang Polytechnic Institute Langfang 065001 China Key Laboratory of Advanced Display and System Application Ministry of Education of China Shanghai UniversityShanghai 200072 China

We demonstrate high-brightness blue organic light emitting diodes(OLEDs) using two types of guest-host systems. A series of blue OLEDs were fabricated using three organic emitters of dibenz anthracene(perylene), di(4-fluorophenyl) amino-di(styryl) biphenyl(DSB) and 4,4'-bis[2-(9-ethyl-3-carbazolyl)vinyl]biphenyl(BCzV Bi) doped into two hosting materials of 4,4'-bis(9-carbazolyl) biphenyl(CBP) and 2-(4-biphenylyl)-5(4-tert-butyl-phenyl)-1,3,4-oxadiazole(PBD) as blue emitting layers, respectively. We achieve three kinds of devices with colors of deep-blue, pure-blue and sky-blue with the Commission Internationale de L'Eclairage(CIE) coordinates of(0.16, 0.10),(0.15, 0.15) and(0.17, 0.24), respectively, by employing PBD as host material. In addition, we present a microcavity device using the PBD guest-host system and achieve high-purity blue devices with narrowed spectrum.

关键词： guest biphenyl brightness coordinates colors normalized Internationale vinyl butyl biochemistry

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Improved performance of polymer solar cells by using inorganic, organic, and doped cathode buffer layers

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Chinese Physics B 2016年第3期25卷 428-433页

作者：王桃红陈长博郭坤平陈果徐韬魏斌 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 Sino-European School of Technology Shanghai University Shanghai 200444 China

The interface between the active layer and the electrode is one of the most critical factors that could affect the device performance of polymer solar cells. In this work, based on the typical poly（3-hexylthiophene）：[6,6]-phenyl C61-butyric acid methyl ester （P3HT：PCBM） polymer solar cell, we studied the effect of the cathode buffer layer （CBL） between the top metal electrode and the active layer on the device performance. Several inorganic and organic materials commonly used as the electron injection layer in an organic light-emitting diode （OLED） were employed as the CBL in the P3HT：PCBM polymer solar cells. Our results demonstrate that the inorganic and organic materials like Cs2CO3, bathophenanthroline （Bphen）, and 8-hydroxyquinolatolithium （Liq） can be used as CBL to efficiently improve the device performance of the P3HT：PCBM polymer solar cells. The P3HT：PCBM devices employed various CBLs possess power conversion efficiencies （PCEs） of 3.0%-3.3%, which are ca. 50% improved compared to that of the device without CBL. Furthermore, by using the doped organic materials Bphen：Cs2CO3 and Bphen：Liq as the CBL, the PCE of the P3HT：PCBM device will be further improved to 3.5%, which is ca. 70% higher than that of the device without a CBL and ca. 10% increased compared with that of the devices with a neat inorganic or organic CBL.

关键词： polymer solar cell interface cathode buffer layer morphology

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Design of achromaticsurface microstructure for near-eye display with diffractive waveguide

arXiv

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arXiv 2017年

作者： Xiao, Jiasheng Liu, Juan Han, Jian Wang, Yongtian China Beijing Engineering Research Center for Mixed Reality and Advanced Display School of Optoelectronics Beijing Institute of Technology Beijing100081 China Key Laboratory of Information System and Technology Beijing Institute of Control and Electronic Technology Beijing100038 China

Dispersion problem has always constrained the development of see-Through near-eye displays with diffractive waveguide. Here, we propose a design method and optical systems for achromatic surface microstructure composed with a triple-carved-sub-grating. The triple-carved-sub-grating with specified period is designed based on rigorous coupled wave theory, corresponding to Red, Green and Blue (RGB) wavelengths, respectively, with diffraction efficiencies of ±1st orders reach 47.5% under TE polarization. The surface microstructure with period of 18.9 is realized by integrating the three sub-gratings together, and it is verified numerically that the diffractive angle of RGB wavelengths is 35° and the crosstalk is less than 4.5% under the normal incidence of TE polarization, which imply the surface microstructure diffracts the certain RGB wavelengths achromatically. Via proper duplication it could be utilized as the combining optics of diffractive-waveguide near-eye display and head-up display because of its light and compact features. m. Copyright © 2017, The Authors. All rights reserved.

关键词： Diffraction

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Enhanced performance of ultraviolet organic light-emitting diode by using graphene oxide and MoO3 dual hole injection layer

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Physica Status Solidi (C) Current Topics in Solid State Physics 2017年第1-2期14卷 n/a-n/a页

作者： Liu, Liming You, Fengjiao Zheng, Qinghong Mo, Bingjie Zeng, Baoqing Wang, Honghang Zhang, Xiaowen Wei, Bin School of Physical Electronics University of Electronic Science and Technology of China Chengdu610054 China Guangxi Key Laboratory of Information Materials and School of Materials Science and Engineering Guilin University of Electronic Technology Guilin541004 China Zhongshan Branch of State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of China Zhongshan Institute Zhongshan528402 China Key Laboratory of Advanced Display and System Applications Ministry of Education Shanghai University Shanghai200072 China

A dual hole injection layer (d-HIL) composed of graphene oxide (GO) and transition metal oxide MoO3 is constructed and proven to be effectively promotes the radiance and external quantum efficiency (EQE) of ultraviolet organic light-emitting diode (UV OLED). The device with d-HIL behaves a maximum radiance of 4.7 mW/cm2 at 237.5 mA/cm2 and EQE of 1.36% at 3.75 mA/cm2, which have been enhanced by 27% and 19%, respectively, in comparison with the coun- terpart using conventional MoO3single HIL. The ultraviolet photoelectron spectroscopy elucidates that GO/MoO3 modification to the greatest extent enhances work function. The current-voltage characteristics and impedance spectroscopy of Hole-only devices clarify that GO/MoO3 d-HIL considerably promotes hole injection capacity. Our results indicate that the d-HIL of GO/MoO3 paves a way for constructing efficient UV OLED. © 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

关键词： Transition metals

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Design of PID temperature control system based on STM32

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IOP Conference Series: Materials Science and Engineering 2018年第7期322卷

作者： Jianxin Zhang Hailin Li Kai Ma Liang Xue Bianhua Han Yuemeng Dong Yue Tan Chengru Gu Tianjin Key Laboratory of Optoelectronic Detection Technology and Systems Tianjin Polytechnic University Tianjin China Tianjin Key Laboratory of Advanced Electrical Engineering and Energy Technology Tianjin Polytechnic University Tianjin China Engineering Research Center of High Power Semiconductor Lighting Application System Education Department Tianjin Polytechnic University Tianjin China State Key Laboratory of Hollow Fiber Membrane Materials and Processes Tianjin Polytechnic University Tianjin China

A rapid and high-accuracy temperature control system was designed using proportional-integral-derivative (PID) control algorithm with STM32 as micro-controller unit (MCU). The temperature control system can be applied in the fields which have high requirements on the response speed and accuracy of temperature control. The temperature acquisition circuit in system adopted Pt1000 resistance thermometer as temperature sensor. Through this acquisition circuit, the monitoring actual temperature signal could be converted into voltage signal and transmitted into MCU. A TLP521-1 photoelectric coupler was matched with BD237 power transistor to drive the thermoelectric cooler (TEC) in FTA951 module. The effective electric power of TEC was controlled by the pulse width modulation (PWM) signals which generated by MCU. The PWM signal parameters could be adjusted timely by PID algorithm according to the difference between monitoring actual temperature and set temperature. The upper computer was used to input the set temperature and monitor the system running state via serial port. The application experiment results show that the temperature control system is featured by simple structure, rapid response speed, good stability and high temperature control accuracy with the error less than ±0.5°C.

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Exciplex formation and electroluminescent absorption in ultraviolet organic light-emitting diodes

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Chinese Physics B 2015年第2期24卷 253-258页

作者：张琪张浩张小文徐韬魏斌 School of Materials Science and Engineering & Key Laboratory of Advanced Display and System Applications Ministry of EducationShanghai University Guangxi Key Laboratory of Information Materials Guilin University of Electronic Technology

We investigated the formation of exciplex and electroluminescent absorption in ultraviolet organic light-emitting diodes（UV OLEDs） using different heterojunction *** is found that an energy barrier of over 0.3 eV between the emissive layer（EML） and adjacent transport layer facilitates exciplex *** electron blocking layer effectively confines electrons in the EML,which contributes to pure UV emission and enhances *** change in EML thickness generates tunable UV emission from 376 nm to 406 *** addition,the UV emission excites low-energy organic function layers and produces photoluminescent *** UV OLED,avoiding the exciplex formation and averting light absorption can effectively improve the purity and efficiency.A maximum external quantum efficiency of 1.2%with a UV emission peak of 376 nm is realized.

关键词： exciplex tunable UV emission electroluminescent absorption

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Erratum to: The Influence of Hafnium Doping on Density-of-States in Zinc Oxide Thin-Film Fransistors Deposited Via Atomic Layer Deposition

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Nanoscale research letters 2017年第1期12卷 172页

作者： Xingwei Ding Cunping Qin Jiantao Song Jianhua Zhang Xueyin Jiang Zhilin Zhang Key Laboratory of Advanced Display and System Application Ministry of Education Shanghai University 149 Yanchang Road Shanghai Jingan District 200070 People's Republic of China. School of Mechatronics and Automation Shanghai University Shanghai 200072 China. Key Laboratory of Advanced Display and System Application Ministry of Education Shanghai University 149 Yanchang Road Shanghai Jingan District 200070 People's Republic of China. dxwshu@***. School of Mechatronics and Automation Shanghai University Shanghai 200072 China. dxwshu@***. Department of Materials Science Shanghai University Shanghai 200072 China.

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Depth map coding method for scalable video plus depth 1

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8th International Conference on Image and Graphics, ICIG 2015

作者： Li, Panpan Ma, Ran Hou, Yu An, Ping School of Communication and Information Engineering Shanghai University Shanghai200072 China Key Laboratory of Advanced Display and System Application of the Ministry of Education Shanghai200072 China

ISBN: (数字)9783319219639

ISBN: (纸本)9783319219622

Depth map coding along with its associated texture video plays an important role in the display of 3D scene by Depth Image Based Rendering technique. In this paper, the inter-layer motion prediction in Scalable Video Coding is applied in order to utilize the similarity of the motion data between texture video and its associated depth map. Additionally, in order to preserve the edge in depth map, the edge detection algorithm is proposed in depth map coding, which combines the conventional Sobel edge detection and the block-based coding scheme of SVC. And the dynamic quantization algorithm is proposed to preserve the information of boundary regions of the depth map. Simulation results show that the proposed method achieves the BDPSNR gains from 0.463 dB to 0.941 dB for the depth map, and the Bjøntegaard bitrates savings range from 9.72% to 19.36% for the video plus depth. © Springer International Publishing Switzerland 2015.

关键词： Edge detection

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