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The 2023 International Conference on Display technology, (ICDT 2023)

作者： Feng, Feng Liu, Yibo Zhang, Ke Chan, Ka-Wah Liu, Zhaojun Kwok, Hoi-Sing State Key Laboratory of Advanced Displays and Optoelectronics Technologies Hong Kong University of Science and Technology Hong Kong Department of Electrical and Electronic Engineering Southern University of Science and Technology China

Ultraviolet band-C (UV-C) micro-light-emitting diodes (Micro-LEDs) with high optical power density are increasingly demanded in the utilization of sterilization, solar-blind communications, and neuroscience for the robust structure and adjustable emission wavelength. In this work, AlGaN UV-C Micro-LEDs are fabricated and characterized in 5×5, 10×10, 20×20, 30×30, 50×50, 80×80, and 100×100 μm2. With pixel size scaling down, the smaller devices have the potential to emit more considerable light output power (LOP) density at the same injected current density. This LOP density sizing effect implies higher luminescence efficiencies on small-sized UV-C Micro-LEDs, which could be widely adopted by the industry. © 2023, John Wiley and Sons Inc. All rights reserved.

关键词： Light emitting diodes

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A volumetric 3D display system based on coded PDLC

A volumetric 3D display system based on coded PDLC

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The 2023 International Conference on Display technology, (ICDT 2023)

作者： Li, An-Ran Srivastava, Abhishek K. Yu, Xin-Yi Sun, Zhi-Bo Yuan, Zheng-Nan State Key Laboratory of Advanced Displays and Optoelectronics Technologies and Centre for Display Research Department of Electronics and Computer Engineering The Hong Kong University of Science and Technology Hong Kong

In this paper, we present an optically transparent multi-planar 3D display device based on multi-passive matrixed coded pixelated polymer-dispersed liquid crystals (PDLC). The PDLC film used in this experiment has high transparency transmission (97.1%) and fast switching time characteristics within 20ms. We provide a method to display different depth-of-field images by layering them on a multi-layer screen, by which it is possible to render near and far views in different planes, thus bringing 3-dimensional visual information to the observer, ultimately A proof-of-concept prototype of a dual-plane 3D display has been realized. © 2023, John Wiley and Sons Inc. All rights reserved.

关键词： Three dimensional displays

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Reducing Resolution Loss in Naked Eye 3D Display Using Dual Ferroelectric Liquid Crystal (FLC) Shutters for Time-multiplexed Light Field Display

Reducing Resolution Loss in Naked Eye 3D Display Using Dual ...

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International Symposium, Seminar, and Exhibition, Display Week 2024

作者： Sun, Zhi-Bo Yuan, Zheng-Nan Huo, Yi-Peng Dong, Shou-Cheng Cheung, Alex Vashchenko, Valerii Vashchenko, Olena Srivastava, Abhishek Kwok, Hoi-Sing State Key Laboratory of Advanced Displays and Optoelectronics Technologies and Center for Display research Department of Electronic and Computer Engineering The Hong Kong University of Science and Technology Clear Water Bay Road Kowloon Hong Kong

Usually, the resolution loss is serious in light field display due to the spatial multiplexing of several neighboring pixels to display images from different directions. With the limitation in the resolution of the flat panel display, the light field 3D display shows insufficient display size, image depth, or resolution. This article utilized the FLC with a fast response at 2 kHz and the optimized charge compensation method to achieve a high refresh time multiplexing method, which can effectively increase the display resolution by up to 32 times and is very promising for light field 3D displays in the future. © 2024, John Wiley and Sons Inc. All rights reserved.

关键词： Flat panel displays

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Truly Bi-stable Ferroelectric Liquid Crystal Based Modulators

Truly Bi-stable Ferroelectric Liquid Crystal Based Modulator...

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International Symposium, Seminar, and Exhibition, Display Week 2024

作者： Swaminathan, Vigneshwaran Vashchenko, Valerii Vashchenko, Olena Bhadra, Debjyoti Mathew, Chris Kwok, Hoi-Sing Srivastava, Abhishek. K. State Key Laboratory of Advanced Displays and Optoelectronics Technologies and Center for Display Research Department of Electronics and Computer Engineering Hong Kong University of Science and Technology Clear Water Bay Road Kowloon Hong Kong

We developed a novel method for achieving long-term (>24 hours) true bi-stability in helix-free Ferroelectric Liquid Crystals (FLCs). Instead of employing asymmetric boundary conditions, traditionally used for achieving bi-stability, we utilized symmetric boundary conditions and carefully optimized the anchoring conditions on both the top and bottom substrates using the photoalignment technology. The key to the newly observed long term bi-stability is the twisted alignment structure. Surface roughness was found to play a crucial role in achieving sustained bi-stability. This breakthrough holds promise for developing truly bi-stable, fast modulators for photonic applications. © 2024, John Wiley and Sons Inc. All rights reserved.

关键词： Liquid crystals

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High Efficiency and Brightness Quantum Rods Light Emitting Diode

High Efficiency and Brightness Quantum Rods Light Emitting D...

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International Symposium, Seminar, and Exhibition, Display Week 2024

作者： Liao, Zebing Prodanov, Maksym F. Mallem, Kumar Kang, Chengbin Song, Jianxin Bhadra, Debjyoti Srivastava, Abhishek K. State Key Laboratory on Advanced Displays and Optoelectronics Technologies and Centre for Display Research Department of Electronics and Computer Engineering The Hong Kong University of Science and Technology Clear Water Bay Kowloon999077 Hong Kong

Despite substantial efforts, the maximum external quantum efficiency (EQE) of red, green, and blue quantum dots remains close to 25%, limited by the outcoupling efficiency of specific device optical structures. Further improvements have primarily focused on optimizing light management. In this study, we employed rodshaped nanocrystals instead of sphere-like quantum dots as the light-emitting layer. The theoretical device outcoupling efficiency significantly increased to nearly 41% due to the intrinsic horizontal dipole alignment within the quantum rod film, nearly doubling the efficiency compared to quantum dot light-emitting diodes (QDLEDs). As a result, we achieved record-high EQEs of 14.1% for green quantum rod light-emitting diodes, with maximum brightness exceeding 150,000 cd/m2, respectively. Our research demonstrates the immense potential of QRLEDs for display and lighting applications, paving a new way for the commercialization of nanocrystal particles. © 2024, John Wiley and Sons Inc. All rights reserved.

关键词： Semiconductor quantum dots

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The strategies to improve TMDs represented by MoS_(2)electrocatalytic oxygen evolution reaction

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Chinese Chemical Letters 2024年第11期35卷 203-213页

作者： Junan Pan Xinyi Liu Huachao Ji Yanwei Zhu Yanling Zhuang Kang Chen Ning Sun Yongqi Liu Yunchao Lei Kun Wang Bao Zang Longlu Wang State Key Laboratory of Organic Electronics and Information Displays&Jiangsu Key Laboratory for Biosensors College of Electronic and Optical Engineering&College of Flexible Electronics(Future Technology)Nanjing 210023China State Key Laboratory of Chemo/Bio-Sensing and Chemometrics College of Chemistry and Chemical EngineeringAdvanced Catalytic Engineering Research Center of the Ministry of EducationHunan UniversityChangsha 410082China

The hydrogen evolution reaction(HER)and the oxygen evolution reaction(OER)are the two half reactions that make up the over water splitting *** oxygen evolution reaction rate wound immensely raise the efficiency of over water splitting reaction because it is the rate limiting reaction in water splitting *** key to improve OER performance is the development and utilization of advanced *** one of the most potential catalysts for HER,it has gradually attracted the attention of researchers in the aspect of catalytic *** is very necessary to review the research progress of Transition metal dichalcogenides(TMDs)in catalytic OER to promote the research process in the *** this review,we comprehensively and systematically summarized the strategies to improve TMDs electrocatalytic *** of all,structural regulation of TMDs-based electrocatalyst was summarized in detail,mainly including size engineering,defect engineering,doping engineering,phase engineering and heterojunction *** more,magnetic field regulation as a representative of external field regulation to improve TMDs electrocatalytic OER performance was discussed in *** but not least,the strategies to improve TMDs electrocatalytic OER is prospected and some views on the development of this field are also put forward,which are expected to enhance the catalytic efficiency of TMDs for OER.

关键词： Oxygen evolution reaction Transition metal dichalcogenides Structural regulation External field regulation Electrocatalyst

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Ultrathin and Air-Stable Lithium Metal Anodes with Superlong Cycling Life in Ether/Ester-Based Electrolytes

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Energy & Environmental Materials 2023年第4期6卷 289-296页

作者： Chao Luo Zihuan Tang Miaomiao Zhang Xiaoyu Feng Rongjie Luo Qifei Guo Xuming Zhang Biao Gao Zhao Ding Yang Zheng Kaifu Huo The State Key Laboratory of Refractories and Metallurgy Institute of Advanced Materials and NanotechnologyWuhan University of Science and TechnologyWuhan 430081China Wuhan National Laboratory for Optoelectronics(WNLO) School of Optical and Electronic InformationHuazhong University of Science and TechnologyWuhan 430074China

Ultrathin and air-stable Li metal anodes hold great promise toward high-energy and high-safety Li metal batteries(LMBs).However,the application of LMBs is technically impeded by existing Li metal anodes with large thickness,high reactivity,and poor ***,we developed a novel and scalable approach for the construction of a 10-μm-thick flexible and air-stable Li metal anode by conformally encapsulating Li within a multifunctional VN ***,the highly lithiophilic VN layer guides a uniform deposition of Li,while abundant and multilevel pores arising from assembly of ultrathin nanosheets enable a spatially confined immersion of metallic Li,thus ensuring an ultrathin and sandwiched Li *** impressively,the strong hydrophobicity of VN surface can effectively improve the stability of anode to humid air,whereas the highly conductive framework greatly boosts charge transfer dynamics and enhances Li utilization and high-rate *** from such fascinating features,the constructed Li-VN anode exhibits ultrastable cycling stability in both ether(2500 h)and carbonate(900 h)electrolytes,***,even exposed to ambient air for 12 h,the anode still can retain~78%capacity,demonstrating excellent air-defendable *** work affords a promising strategy for fabricating high-performance,high-safety,and low-cost LMBs.

关键词： air stable highly lithiophilic lithium metal anodes ultrathin VN

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High-brightness and high-efficiency diode laser module based on a coherent-spectral beam combining external cavity

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Chinese Optics Letters 2024年第12期22卷 70-73页

作者： Lingqian Meng Weiqiao Zhang Jing Liu Peng Cao Yufei Wang Xuyan Zhou Wanhua Zheng Laboratory of Solid State Optoelectronics Information Technology Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Weifang Academy of Advanced Opto-Electronic Circuits Weifang 261071China State Key Laboratory on Integrated Optoelectronics Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China College of Future Technology University of Chinese Academy of SciencesBeijing 101408China

A hybrid cavity structure based on individual laser diode integrating coherent beam combining(CBC)and spectral beam combining(SBC)is *** CBC structure is used to enhance laser output power while optimizing beam quality,and the SBC structure is employed to further increase laser output *** output power of 1.42 W was obtained at 0.55 A,with a high combining efficiency of 87.2%.Additionally,the brightness of this structure is 58.65 MW·cm^(-2)·sr^(-1),which is 3.66times that of a single laser *** entire structure provides a new approach for increasing the output power and optimizing the beam quality of the laser diode.

关键词： high brightness coherent beam combining spectral beam combining

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Time-multiplexing Method Using Dual Ferroelectric Liquid Crystal Shutters for Light Field 3D Display

Time-multiplexing Method Using Dual Ferroelectric Liquid Cry...

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International Conference on Display technology, 2024

作者： Sun, Zhi-Bo Yuan, Zheng-Nan Huo, Yi-Peng Dong, Shou-Cheng Cheung, Alex Vashchenko, Valerii Vashchenko, Olena Srivastava, Abhishek Kwok, Hoi-Sing State Key Laboratory of Advanced Displays and Optoelectronics Technologies Center for Display research Department of Electronic and Computer Engineering The Hong Kong University of Science and Technology Clear Water Bay Road Kowloon Hong Kong

In light field displays, the resolution loss is a serious problem, leading to insufficient image depth, display size, and resolution. Here, we achieve a high refresh time multiplexing method that can effectively increase the display resolution by up to 32 times. Ferroelectric Liquid Crystal (FLC) with a fast response at 2 kHz and an optimized charge compensation method is proposed in this *** is very promising for light field 3D displays in the future. © 2024 John Wiley and Sons Inc. All rights reserved.

关键词： Time division multiplexing

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Serrated lithium fluoride nanofibers-woven interlayer enables uniform lithium deposition for lithium-metal batteries

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National Science Review 2022年第11期9卷 194-207页

作者： Shuangshuang Tan Yalong Jiang Shuyan Ni Hao Wang Fangyu Xiong Lianmeng Cui Xuelei Pan Chen Tang Yaoguang Rong Qinyou An Liqiang Mai State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology College of Materials Science and Engineering Chongqing University Wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory

The uncontrollable formation of Li dendrites has become the biggest obstacle to the practical application of Li-metal anodes in high-energy rechargeable Li batteries. Herein, a unique LiF interlayer woven by millimeter-level, single-crystal and serrated LiF nanofibers（NFs） was designed to enable dendrite-free and highly efficient Li-metal deposition. This high-conductivity Li F interlayer can increase the Li+transference number and induce the formation of 'Li F–NFs-rich' solid–electrolyte interface（SEI）. In the 'Li F–NFs-rich'SEI, the ultra-long Li F nanofibers provide a continuously interfacial Li+transport path. Moreover, the formed Li–LiF interface between Li-metal and SEI film renders low Li nucleation and high Li+migration energy barriers, leading to uniform Li plating and stripping processes. As a result, steady charge–discharge in a Li//Li symmetrical cell for 1600 h under 4 m Ah cm-2and 400 stable cycles under a high area capacity of 5.65 mAh cm-2in a high-loading Li//rGO–S cell at 17.9 mA cm-2could be achieved. The free-standing LiF –NFs interlayer exhibits superior advantages for commercial Li batteries and displays significant potential for expanding the applications in solid Li batteries.

关键词： lithium fluoride serrated nanofibers LiF interlayer uniform Li deposition lithium-metal batteries

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