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Simulation study on thermal mechanical properties of 4×4 Micro-LED array in flip-chip bonding process

Simulation study on thermal mechanical properties of 4×4 Mi...

China International Forum o Solid State Lighting: International Forum on Wide Bandgap Semiconductors China (SSLChina: IFWS)

作者： Xiaoxiao Ji Fei Wang Luqiao Yin Jianhua Zhang Key Laboratory of Advanced Display and System Applications Shanghai University Ministry of Education Shanghai China School of Mechatronic Engineering and Automation Shanghai University Shanghai China School of microelectronics Shanghai University Shanghai China

ISBN: (纸本)9781665495479

With the advent of the Micro-light-emitting diodes, it has become the focus of display and visible light communication research. However, as the LED chip size shrinks, the difficulty of integration increase gradually. Nowadays, the integration of Micro- LEDs in display is still a challenge for commercialization. In this work, we conducted a comparative study by finite element method simulation to reveal the influencing factors of bonding yield. The results show that stress concentrates at the junction of the bumps and electrodes of Micro-LED chips, and the stress concentration at the corner of Micro-LED array is more seriously. By altering the parameters of bumps, such as shapes and materials to reduce the stress and stress concentration. Numerical simulate results provide theoretical basis for reducing stress and stress concentration and optimizing the bump shape.

关键词： Shape Tin Light emitting diodes Silicon Indium Bonding Stress

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Research on panoramic illumination imaging system based on SURF algorithm

Research on panoramic illumination imaging system based on S...

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China International Forum o Solid State Lighting: International Forum on Wide Bandgap Semiconductors China (SSLChina: IFWS)

作者： Fei Wang Xiaoxiao Ji Luqiao Yin Aiying Guo Jianhua Zhang School of microelectronics Shanghai University Shanghai China Key Laboratory of Advanced Display and System Applications Ministry of Education Shanghai University Shanghai China School of Mechatronic Engineering and Automation Shanghai University Shanghai China

ISBN: (纸本)9781665495479

Underwater lighting systems and imaging systems are mainly used in underwater pipeline internal inspection, underwater environment information collection, resource detection, etc. This article explores a panoramic lighting imaging system based on an underwater environment. Mainly from the intelligent lighting system, panoramic imaging system, and system integration optimization. The intelligent lighting system mainly explores a high-brightness intelligent lighting device with a high-brightness lighting system. The imaging system mainly works in conjunction with the lighting system. The imaging system mainly collects 250° panoramic picture information and 250° video information for scientific research and other tasks. Provide appropriate information and data. Finally, system integration optimization and joint work are carried out.

关键词： Temperature Splicing Lighting Imaging system integration Streaming media Real-time systems

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CQD-LEDs with High Colour Rendering Index 17

CQD-LEDs with High Colour Rendering Index

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17th China International Forum on Solid State Lighting and 2020 International Forum on Wide Bandgap Semiconductors China, SSLChina: IFWS 2020

作者： Yan, Yuxian Zhang, Doudou Yin, Luqiao Zhang, Jianhua Shanghai University School of Materials Science and Engineering Shanghai200072 China Shanghai University Ministry of Education Key Laboratory of Advanced Display and System Applications Shanghai200072 China School of Mechatronics and Automation Shanghai University Shanghai200072 China

ISBN: (纸本)9780738111889

Quantum dots (QD), which is considered the ideal candidate of third generation semiconductor lighting, has the advantages of high quantum yield, adjustable emission wavelength and narrow full width at half maxima (FWHM), thus it is an ideal choice as the colour converting materials for LEDs. InGaN LEDs are the main choice of solid-state lighting, which is always applied with Ce-doped yttrium aluminum garnet (YAG: Ce3+) yellow phosphor to achieve white light. However, white light achieved by this method has a low colour rendering index (CRI), mainly because of the missing of red spectral components in YAG: Ce3+, thus the CRI is lower than 80 and the correlated colour temperature (CCT) is always above 6500K. In order to increase the CRI of white LEDs, in this paper, we fabricated yellow CQDs and applied it on blue LED chips, red QD films were also used to increase the CRI of our white LEDs. The result shows that the white LEDs with yellow CQDs and red QD films has a max CRI of 94.3 at a driving current of 70mA, the Commission International de L'Eclairage (CIE) chromaticity coordinates are (0.325, 0.3435), and the CCT is 5832K, which is white light with high CRI and can be used in indoor lighting. © 2020 IEEE.

关键词： Yttrium aluminum garnet

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A New Low-power Pixel Circuit for OLEDoS Microdisplay 17

A New Low-power Pixel Circuit for OLEDoS Microdisplay

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17th China International Forum on Solid State Lighting and 2020 International Forum on Wide Bandgap Semiconductors China, SSLChina: IFWS 2020

作者： Hao, Deng Aiying, Guo Feng, Ran Shanghai University Microelectronic Research Development Center 99 Shangda Road Baoshan District Shanghai200444 China Shanghai University Key Laboratory of Advanced Display and System Applications 99 Shangda Road Baoshan District Shanghai200072 China

ISBN: (纸本)9780738111889

In order to solve the problem of high bandwidth data volume and low power consumption of OLEDoS microdisplay panels, this paper proposes a new type of digital low-power pixel circuit. The driving circuit includes a plurality of pixel driving units, which can store multi-pixel bit information at one time, thereby reducing the amount of data read operation. Compared with the traditional digital pixel circuit, the proposed circuit can skip the grayscale data writing process when the picture is still or the rate of change is low, thus reducing the data flow and power consumption. © 2020 IEEE.

关键词： Electric power utilization

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Computational Analysis of Quantum Dots as Color Conversion Layer for Micro-LED applications

Computational Analysis of Quantum Dots as Color Conversion L...

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China International Forum o Solid State Lighting: International Forum on Wide Bandgap Semiconductors China (SSLChina: IFWS)

作者： Pengsen Lin Xiaoxiao Ji Luqiao Yin Jianhua Zhang School of Materials Science and Engineering Shanghai University Shanghai China Key Laboratory of Advanced Display and System Applications Shanghai University Ministry of Education Shanghai China School of Mechatronics and Automation Shanghai University Shanghai China

ISBN: (纸本)9781665495479

We propose a simulation scheme for studying quantum dot (QD) light effects of full-color micro-light-emitting-diode (micro-LED) arrays. We have studied the influence of QD thickness and concentration on light efficiency. The results show that the QD concentration and thickness have an impact on the light efficiency. When the thickness of the QD is 5 µm, or the maximum light conversion efficiency can be obtained when the concentration is 0.1 mol/L. By analyzing the light field distribution of different QD thicknesses, the light crosstalk phenomenon is observed. This kind of crosstalk can cause blurry display images and should be avoided.

关键词： Analytical models Image color analysis Computational modeling Simulation Quantum dots Crosstalk Optical imaging

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Band Structure Engineering of Black Phosphorus/Graphene/MoS2van der Waals Heterojunctions for Photovoltaic and Optoelectronic Device Application

Band Structure Engineering of Black Phosphorus/Graphene/MoS2...

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2021 International Conference on Advances in Optics and Computational Sciences, ICAOCS 2021

作者： Zhu, Wenhuan Kong, Lingwei Long, Wei Shi, Xianglei Zhou, Dayong Sun, Lijie Zhou, Lihua Yang, Guiting Liu, Xiaodong Liu, Hai Bo, Maolin Hou, Xiaoqiang Department of Micro/Nano Electronics School of Electronic Information and Electrical Engineering Shanghai Jiao Tong University Shanghai China State Grid Nanchong Power Supply Company Nanchong China State Key Laboratory of Space Power-Sources Technology Shanghai China Shanghai Institute of Space Power-Sources Shanghai China Guizhou Space Appliance Co. Ltd. Guizhou China Key Laboratory of Advanced Display and System Applications of Ministry of Education Shanghai University Shanghai China Key Laboratory of Extraordinary Bond Engineering and Advanced Materials Technology of Chongqing Yangtze Normal University Chongqing China

In this paper, we study the band structure engineering of black phosphorus/graphene/MoS2 (BP/graphene/MoS2) van der Waals heterojunctions based on ab initio simulations. The density of state and charge density of BP/MoS2, bilayer-BP/MoS2, bilayer-BP/graphene/MoS2 and graphene/bilayer-BP/MoS2 heterojunctions are also investigated. It is found that the bandgaps of these four heterojunctions are smaller than the case of single layer BP or MoS2. When graphene is inserted into or stacked upon BP and MoS2 layers, the heterojunction can obtain a minimum bandgap and a higher density of state distribution. In the differential charge density diagram, electrons over the carbon, sulfur and phosphorus atoms are lost from those corresponding parts. These investigations based on the band structure engineering of 2D van der Waals heterojunctions can provide an effective guidance to manufacture the future nanoscale high performance photovoltaic and optoelectronic devices. © Published under licence by IOP Publishing Ltd.

关键词： Heterojunctions

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Solution-processed inorganic charge transport layers for efficient and stable quantum-dot LEDs

Solution-processed inorganic charge transport layers for eff...

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International Conference on display Technology, ICDT 2019

作者： Yang, Xuyong Cao, Fan Wang, Haoran Shen, Piaoyang Key Laboratory of Advanced Display and System Applications of Ministry of Education Shanghai University 149 Yanchang Road 20007 China

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31.1:Invited Paper:Highly Efficient Light-emitting Devices Based on Quantum dots/Perovskites

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SID Symposium Digest of Technical Papers 2022年第S1期53卷

作者： Lin Wang Lingmei Kong Xuyong Yang Key Laboratory of Advanced Display and System Applications of Ministry of Education Shanghai University 149 Yanchang Road Shanghai 200072 China

Colloidal quantum dots/perovskites based light-emitting diodes (QLEDs/PeLEDs) have attracted extensive attention for lighting and display applications because of their excellent advantages, such as narrow emission bandwidth, color tunability, high brightness and low-cost fabrication techniques. The external quantum efficiencies (EQEs) for QLEDs/PeLEDs are catching up with those for commercial organic light-emitting diodes (OLEDs), thanks to the quantum efficiency improvement, the device configuration optimization as well as the deep understanding of electroluminescence principle. Despite the rapid advance in device performance has been achieved, the operational lifetime of these devices still cannot meet the requirements for practical applications. In this report, we will present our latest advances in improving performance and stability of high color-purity QLEDs/PeLEDs.

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Synthesis, Characterization, Photophysical and Electroluminescent Properties of Iridium Complexes with Cf3-Substituted 1,3,4-Oxadiazole Amide Ancillary Ligands

SSRN

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SSRN 2023年

作者： Zhang, Fuli Li, Ting Zhao, Yunping Feng, Cuilan Han, Huabo Wei, Donghui Li, Zhongyi Zhai, Bin Liu, Daosheng Wei, Bin School of Petrochemical Engineering Liaoning Petrochemical University Fushun113001 China Engineering Technical Research Centre for Optoelectronic Functional Materials of Henan Province Key Laboratory of Biomolecular Recognition and Sensing of Henan Province College of Chemistry and Chemical Engineering Shangqiu Normal University Shangqiu476000 China Key Laboratory of Advanced Display and System Applications Ministry of Education School of Mechatronic Engineering and Automation Shanghai University Shanghai200072 China College of Chemistry and Molecular Engineering Zhengzhou University Zhengzhou450001 China Shanxi Datong University China

In this work, we synthesized four new heteroleptic iridium(III) complexes Ir1−Ir4 using CF3-substituted 1,3,4-oxadiazole amide with excellent electron mobility as ancillary ligands. Crystal structure, photophysical and electrochemical properties of Ir1−Ir4 were studied in detail, and theoretical calculations were performed to interpret their photophysical behaviors. At room temperature, complexes Ir1 and Ir2 emit almost coincident green phosphorescence peaked at 506 nm with Commission Internationale de l’Eclairage (CIE) color coordinates of (0.21, 0.64) and (0.24, 0.64), respectively. Complexes Ir3 and Ir4 exhibit greenish blue and greenish yellow light with double-peaks structure located at 496 and 531 nm with CIE color coordinates of (0.20, 0.40) and (0.30, 0.52), respectively. The phosphorescent organic light-emitting diodes (PHOLEDs) based on these complexes exhibit very mild efﬁciency roll-off, which is attributed to the application of the emitters using CF3-substituted 1,3,4-oxadiazole amide with excellent electron mobility as ancillary ligands. © 2023, The Authors. All rights reserved.

关键词： Iridium compounds

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A new pixel structure for OLEDoS micro-display

A new pixel structure for OLEDoS micro-display

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International Conference on display Technology, ICDT 2019

作者： Guo, Aiying Ran, Feng Zhang, Jianhua Microelectronic Research and Development Center Shanghai China Key Laboratory of Advanced Display and System Applications Ministry of Education Shanghai China

ISBN: (纸本)9781510896161

In this paper, we propose a new pixel structure for the organic Light Emitting Diode (OLED) 0.65 inch SVGA resolution micro-display with 8 bit gray level. The proposed pixel structure is composed of 4 MOSFETS and one capacitor to integrate the pixel structure in the restricted pixel area ( 9um 9um ) using 0.18um technology. The simulation result shows that the maximum error of emission current occurs at high gray level. Author keywords © 2019, John Wiley and Sons Inc. All rights reserved.

关键词： MOSFET devices

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