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Rational Design of Oxygen-Enriched Carbon Dots with Efficient Room-Temperature Phosphorescent Properties and High-Tech Security Protection Application

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ACS Sustainable Chemistry & Engineering 2019年第24期7卷 19918-19924页

作者： Yu Han Ming Li Jiawei Lai Weitao Li Yijian Liu Luqiao Yin Lianqiao Yang Xiaogang Xue Robert Vajtai Pulickel M. Ajayan Liang Wang Institute of Nanochemistry and Nanobiology School of Environmental and Chemical Engineering Shanghai University No.99 Shangda Road Baoshan District Shanghai 200444 P. R. China Department of Materials Science and NanoEngineering Rice University 6100 Main Street Houston Texas 77005 United States Key Laboratory of Advanced Display and System Applications Shanghai University Ministry of Education No.149 YanChang Road Jingan District Shanghai 200072 P. R. China School of Materials Science and Engineering Guangxi Key Laboratory of Information Materials Guilin University of Electronic Technology 1 Jinji Road Guilin 541004 P. R. China

Room-temperature phosphorescent (RTP) carbon dots (CDs) have been fascinated by a lot of scholars because of their stable triplet excited states and environmental friendliness. Herein, novel fluorescent oxygen-enriched CDs were synthesized by a simple one-step solvothermal approach, which can be applied in cell imaging directly as a nontoxic fluorescent probe. When mixing the CDs with polyvinyl alcohol, the composite exhibits excellent RTP performance, which has the exciting prospect of applications in security protection. The observed RTP is attributed to the lone pair electrons provided by oxygen-rich functional groups of CDs. Benefitting from the n → π* transition and triplet exciton filling, the C–O–C groups of CDs play a significant role in their ultralong RTP performance. Our finding creates an avenue for advanced security protection technology based on metal-free RTP carbon nanomaterials.

关键词： Composites Phosphorescence Fluorescence Cadmium sulfide Materials

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Synthesis of graphene quantum dot/metal–organic framework nanocomposites as yellow phosphors for white light-emitting diodes

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New Journal of Chemistry 2018年第7期42卷 5083-5089页

作者： Dengyu Pan Lijun Wang Zhen Li Bijiang Geng Chen Zhang Jing Zhan Luqiao Yin Liang Wang School of Environmental and Chemical Engineering Shanghai University Shanghai 200444 P. R. China Key Laboratory of Advanced Display and System Applications Shanghai University Shanghai P. R. China Institute of Nanochemistry and Nanobiology Shanghai University Shanghai 200444 P. R. China

A new luminescent composite material GQD@ZIF-8 was obtained by incorporating edge-sulfonated graphene quantum dots (GQDs) as an active fluorescent species into nanocrystals of the zeolitic imidazolate framework (ZIF-8) as both a stabilizer and a carrier by a simple, rapid, and eco-friendly approach. The as-synthesized GQD@ZIF-8 composite not only exhibits excellent fluorescence properties in aqueous solutions but can also emit bright fluorescence in the solid state due to the effective encapsulation by ZIF-8. The GQD@ZIF-8 nanocomposite was used as a novel yellow phosphor in the fabrication of white light-emitting diodes (WLEDs) based on a blue-light LED chip with a proximate CIE coordinate (0.33, 0.33) of highly pure white light and a relatively high color-rendering index.

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Lead-Free Nanocrystals: Bright Blue Light-Emitting Doped Cesium Bromide Nanocrystals: Alternatives of Lead-Free Perovskite Nanocrystals for White LEDs (advanced Optical Materials 10/2019)

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advanced Optical Materials 2019年第10期7卷

作者： Zhiwen Yang Zhao Jiang Xinyi Liu Xiaochuan Zhou Jianhua Zhang Wanwan Li State Key Lab of Metal Matrix Composites School of Materials Science and Engineering Shanghai Jiao Tong University 800 Dongchuan Road Shanghai 200240 P. R. China Key Laboratory of Advanced Display and System Applications Ministry of Education Shanghai University Shanghai 200072 China

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Metal Halide Perovskites: Metal Halide Perovskite Nanorods: Shape Matters (Adv. Mater. 46/2020)

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advanced Materials 2020年第46期32卷

作者： Chengxi Zhang Jiayi Chen Sheng Wang Lingmei Kong Simon W. Lewis Xuyong Yang Andrey L. Rogach Guohua Jia Key Laboratory of Advanced Display and System Applications of Ministry of Education Shanghai University 149 Yanchang Road Shanghai 200072 P. R. China Curtin Institute of Functional Molecules and Interfaces School of Molecular and Life Sciences Curtin University GPO Box U1987 Perth WA 6845 Australia Department of Materials Science and Engineering & Centre for Functional Photonics (CFP) City University of Hong Kong Kowloon Hong Kong SAR P. R. China

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Full-color fluorescent carbon quantum dots

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Science advances 2020年第40期6卷 eabb6772页

作者： Liang Wang Weitao Li Luqiao Yin Yijian Liu Huazhang Guo Jiawei Lai Yu Han Gao Li Ming Li Jianhua Zhang Robert Vajtai Pulickel M Ajayan Minghong Wu Institute of Nanochemistry and Nanobiology School of Environmental and Chemical Engineering Shanghai University Shanghai 200444 P. R. China. wangl@*** mhwu@***. Department of Materials Science and NanoEngineering Rice University Houston TX 77005 USA. Institute of Nanochemistry and Nanobiology School of Environmental and Chemical Engineering Shanghai University Shanghai 200444 P. R. China. Key Laboratory of Advanced Display and System Applications Ministry of Education Shanghai University Shanghai 200072 P. R. China.

Quantum dots have innate advantages as the key component of optoelectronic devices. For white light-emitting diodes (WLEDs), the modulation of the spectrum and color of the device often involves various quantum dots of different emission wavelengths. Here, we fabricate a series of carbon quantum dots (CQDs) through a scalable acid reagent engineering strategy. The growing electron-withdrawing groups on the surface of CQDs that originated from acid reagents boost their photoluminescence wavelength red shift and raise their particle sizes, elucidating the quantum size effect. These CQDs emit bright and remarkably stable full-color fluorescence ranging from blue to red light and even white light. Full-color emissive polymer films and all types of high-color rendering index WLEDs are synthesized by mixing multiple kinds of CQDs in appropriate ratios. The universal electron-donating/withdrawing group engineering approach for synthesizing tunable emissive CQDs will facilitate the progress of carbon-based luminescent materials for manufacturing forward-looking films and devices.

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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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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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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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