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

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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Improvement of barrier performance in thin film encapsulation for organic light-emitting diodes by a prior planarization process

Improvement of barrier performance in thin film encapsulatio...

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第十九届国际电子封装技术会议(ICEPT 2018)

作者： Cunping Qin Xingwei Ding Jianhua Zhang Jun Yang Tao Xu School of Mechatronic Engineering and Automation Shanghai University Shanghai China School of Material Science and Engineering Shanghai University Shanghai China Key Laboratory of Advanced Display and System Applications of Ministry of Education Shanghai Univers

The organic/inorganic hybrid barriers were fabricated to encapsulate the organic light-emitting ***2O3 as inorganic layer was deposited by atomic layer deposition(ALD)and polydimethoxysilane(PDMS)as organic layer was prepared by the spin-coating *** was found that the optimized encapsulation structure with a prior planarization process had a better barrier performance with a lower water vapor transmission rate improved effectively from 4.95 × 10-1 gm-2 day-1 of Al2O3/PDMS films to 7.30 × 10-3 gm-2 day-1 of the hybrid PDMS/Al2O3/PDMS films at 60℃ and a relative humidity of 90%and a longer luminance decay *** improvements were attributed to the surface planarization of encapsulation basement including the coverage of particles by the prior spin-coating process,reducing the defects of inorganic film in process,and the hydrophobic surface of the outermost polymer lowering the adsorption of water vapor.

关键词： Organic/inorganic hybrid barriers Organic light-emitting diodes Planarization process Water vapor transmission rate

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Hybrid plasmonic nano-emitters with controlled single quantum emitter positioning on the local excitation field

arXiv

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arXiv 2020年

作者： Ge, Dandan Marguet, Sylvie Issa, Ali Jradi, Safi Nguyen, Tien Hoa Nahra, Mackrine Béal, Jéremie Deturche, Régis Chen, Hongshi Blaize, Sylvain Plain, Jérôme Fiorini, Céline Douillard, Ludovic Soppera, Olivier Dinh, Xuan Quyen Dang, Cuong Yang, Xuyong Xu, Tao Wei, Bin Sun, Xiao Wei Couteau, Christophe Bachelot, Renaud Laboratory CNRS ERL 7004 University of Technology of Troyes 12 rue Marie Curie Troyes CedexF-10004 France Shenzhen Planck Innovation Technologies Co. Ltd Shenzhen China Université Paris Saclay CEA CNRS NIMBE Gif sur YvetteF-91191 France 50 Nanyang Drive Singapore637553 Singapore Université Paris Saclay CEA CNRS SPEC Gif sur YvetteF-91191 France Université de Haute Alsace CNRS IS2M UMR 7361 MulhouseF-68100 France Université de Strasbourg France Thales Solutions Asia Pte Ltd R&T Department 21 Changi North Rise Singapore498788 Singapore School of Electrical and Electronic Engineering Nanyang Technological University Nanyang Avenue Singapore639798 Singapore School of Mechatronic Engineering and Automation Key lab of advanced display and system application Ministry of Education Shanghai University Shanghai2000072 China Sino-European School of Technology Shanghai University Shanghai China Department of Electrical and Electronic Engineering Southern University of Science and Technology Shenzhen Guangdong518055 China

Hybrid plasmonic nanoemitters based on the combination of quantum dot emitters (QD) and plasmonic nanoantennas open up new perspectives in the control of light. However, precise positioning of any active medium at the nanoscale constitutes a challenge. Here, we report on the optimal overlap of antenna’s near-field and active medium whose spatial distribution is controlled via a plasmon-triggered 2-photon polymerization of a photosensitive formulation containing QDs. Au nanoparticles of various geometries are considered. The response of these hybrid nano-emitters is shown to be highly sensitive to the light polarization. Different light emission states are evidenced by photoluminescence measurements. These states correspond to polarization-sensitive nanoscale overlap between the exciting local field and the active medium distribution. The decrease of the QD concentration within the monomer formulation allows trapping of a single quantum dot in the vicinity of the Au particle. The latter objects show polarization-dependent switching in the single-photon regime. Copyright © 2020, The Authors. All rights reserved.

关键词： Semiconductor quantum dots

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P-13.7: High-quality OLED Micro-display aided by PGL-SCS operator

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

作者： Aiying Guo Feng Ran Jianhua Zhang Meihua Xu Huaming Shen Key Laboratory of Advanced Display and System Applications Ministry of Education Shanghai China Microelectronic Research and Development Center Shanghai China School of Mechatronics Engineering and Automation Shanghai China

In the high-quality OLED micro-display, it is difficult to balance the faster frame refresh rate and higher resolution frame. In order to solve this problem, this paper propose a high-efficient PGL-SCS (Particle Gray Level-Scan Control Strategy) operator as the new scan strategy, which is based on the digital fractal scan strategy. This paper firstly introduces the theory model of PGL-SCS operator, which based on the relationship between sub-space code sequences and bit code sequences for different gray levels. Second, the theory performance of PGL-SCS is analysed. At last, the PGL-SCS operator is tested using the IP core and self-build HD OLED micro-display system. The experiments shows that the PGL-SCS operator can obtain 100% scan utilization and a significant decrease in the system clock frequency, compared with the traditional scan methods. With the proposed PGL-SCS there is no need of using high-speed IC circuits to realize the high-resolution and high-quality OLED micro-display system.

关键词： PGL-SCS Scan OLED Micro-display Digital

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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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Light-Emitting Diodes: Fast Postmoisture Treatment of Luminescent Perovskite Films for Efficient Light-Emitting Diodes (Small 15/2018)

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Small 2018年第15期14卷

作者： Haoran Wang Xiaomin Li Mingjian Yuan Xuyong Yang Key Laboratory of Advanced Display and System Applications of Education of Ministry Shanghai University 149 Yanchang Road Shanghai 200072 China College of Chemistry Nankai University 94 Weijin Road Tianjin 300071 China

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Bright hybrid white light-emitting quantum dot device with direct charge injection into quantum dot

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Chinese Physics B 2016年第12期25卷 514-519页

作者：曹进谢婧薇魏翔周洁陈超平王子兴田哲圭 Key Laboratory of Advanced Display and System Applications Ministry of EducationShanghai University School of Materials Science and Engineering Shanghai University National Engineering Laboratory of TFT-LCD Materials and Technologies Department of Electronic EngineeringShanghai Jiao Tong University School of Green Energy & Semiconductor Engineering Hoseo University

A bright white quantum dot light-emitting device （white-QLED） with 4-[4-（1-phenyl-lH-benzo[d]imidazol-2- yl）phenyl]-2- [3-（tri-phenylen-2-yl）phen-3-yl]quinazoline deposited on a thin film of mixed green/red-QDs as a bilayer emitter is fabricated. The optimized white-QLED exhibits a turn-on voltage of 3.2 V and a maximum brightness of 3660 cd/m2 @8 V with the Commission Internationale de l＇Eclairage （CIE） chromaticity in the region of white light. The ultra-thin layer of QDs is proved to be critical for the white light generation in the devices. Excitation mechanism in the white-QLEDs is investigated by the detailed analyses of electroluminescence （EL） spectral and the fluorescence lifetime of QDs. The results show that charge injection is a dominant mechanism of excitation in the white-QLED.

关键词： quantum dot light-emitting devices white ultra-thin film charge injection

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Improved Out-coupling emission of organic Light-emitting diodes by employing longitudinal wave guides

Improved Out-coupling emission of organic Light-emitting dio...

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International Conference on Material Science and Engineering（ICMSE 2016）

作者： Yang Lin Shiqi Liu Weiling Li Guo Chen Bin Wei Key Laboratory of Advanced Display and System Applications Ministry of Education Shanghai University

We improved the current efficiencies of Organic Light-emitting diodes from 50 cd/A to 77.7and 65.4 cd/A by employing Ag-thin-film and Al2O3-thin-film longitudinal wave guides with the same device structures, respectively, which was attributed to the recycle use of the internal mode because the reflection of the thin-film longitude wave guides. In addition, the introduction of these wave guides exported slight influence on the spectra which was resulted from mode selection by the micro-cavity consisting of ITO and organic layers.

关键词： Improved Out-coupling emission of organic Light-emitting diodes by employing longitudinal wave guides

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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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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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