Search Results - "Hoi Wai Choi"

Robust Simulation Methodology for Surface-Roughness Loss in Interconnect and Package Modelings by Chen, Quan, Choi, Hoi Wai, Wong, Ngai

“…In multigigahertz integrated-circuit design, the extra energy loss caused by conductor surface roughness in metallic interconnects and packagings is more…”
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Monolithic Integration of GaN-on-Sapphire Light-Emitting Diodes, Photodetectors, and Waveguides by Kwai Hei Li, Yuk Fai Cheung, Wai Yuen Fu, Wong, Kenneth Kin-Yip, Hoi Wai Choi

“…We demonstrate the monolithic integration of light-emitting diodes (LEDs), photodetectors (PDs), and waveguides on a GaN-on-sapphire wafer. The InGaN/GaN…”
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Advances in III-nitride semiconductor microdisk lasers by Zhang, Yiyun, Zhang, Xuhui, Li, Kwai Hei, Cheung, Yuk Fai, Feng, Cong, Choi, Hoi Wai

“…This paper reviews the recent progress in the design and fabrication strategies of III‐nitride semiconductor microdisk lasers on sapphire or Si substrates…”
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GaN Nano-Cones Prepared by Jet-Printed Nanospheres Arrays by Zhang, Xuhui, Choi, Hoi Wai

“…Site and dimension controllable nanocone arrays have been fabricated by a combination of inkjet-printing and nanosphere lithography. Each printed array is of…”
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Reduction of Thermal Resistance and Optical Power Loss Using Thin-Film Light-Emitting Diode (LED) Structure by Huan Ting Chen, Yuk Fai Cheung, Hoi Wai Choi, Siew Chong Tan, Hui, S. Y.

“…In this paper, a GaN light-emitting diode (LED) with sapphire structure and a thin-film LED without sapphire structure are characterized in the photo…”
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Polarized Emission From InGaN Light-Emitting Diodes With Self-Assembled Nanosphere Coatings by Zhang, Qian, Li, Kwai Hei, Choi, Hoi Wai

“…The polarization behavior of light emission from InGaN light-emitting diodes (LEDs) with nanosphere opal coatings has been studied. The close-packed nanosphere…”
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Optical and Thermal Analyses of Thin-Film Hexagonal Micro-Mesh Light-Emitting Diodes by Li, Kwai Hei, Cheung, Yuk Fai, Zhang, Qian, Choi, Hoi Wai

“…Vertical thin-film light-emitting diodes (LEDs) with integrated micro-mesh arrays are reported. By removing the sapphire substrate through laser lift-off,…”
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1-µm Micro-Lens Array on Flip-Chip Light-Emitting Diode by Li, Kwai Hei, Zhang, Qian, Choi, Hoi Wai

“…The fabrication of hexagonally close-packed micro-lens array on sapphire face of flip-chip bonded LED by nanosphere lithography is demonstrated. Self-assembled…”
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Phosphor-free InGaN nanopillar white LEDs by random clustering of mono-sized nanospheres by Fu, Wai Yuen, Choi, Hoi Wai

“…Nanosphere lithography with mono-sized nanospheres has been employed as a patterning tool of nanostructuring to achieve phosphor-free white-light emission in…”
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Electrically injected InGaN microdisk lasers: A review of progress, challenges, and future prospects by Fu, Wai Yuen, Choi, Hoi Wai

“…The minimalistic design of InGaN-based MQW microdisk lasers based on whispering gallery mode (WGM) resonances has been attracting research interests in recent…”
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High-density matrix-addressable AlInGaN-based 368-nm microarray light-emitting diodes by Chan-Wook Jeon, Hoi Wai Choi, Gu, E., Dawson, M.D.

“…We report on the fabrication of ultraviolet (UV) microarray light-emitting diodes, toward applications including mask-free photolithographic exposure. Devices…”
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Optical Characterization of InGaN Quantum Structures at the Nanoscale by Fu, Wai Yuen, Choi, Hoi Wai

“…This review paper presents an overview of the optical characterization techniques for Indium Gallium Nitride (InGaN) quantum well (QW) structures at a…”
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Intensity-Stabilized LEDs With Monolithically Integrated Photodetectors by Li, Kwai Hei, Lu, Haitao, Fu, Wai Yuen, Cheung, Yuk Fai, Choi, Hoi Wai

“…To overcome light output degradations and fluctuations of intensities from light-emitting diodes (LEDs) over time, the monolithic integration of InGaN LEDs and…”
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Front Cover: Optical Characterization of InGaN Quantum Structures at the Nanoscale (Adv. Quantum Technol. 6/2024) by Fu, Wai Yuen, Choi, Hoi Wai

“…In article number 2300335, Wai Yuen Fu and Hoi Wai Choi review nano‐optical techniques for characterising InGaN quantum wells. The study contrasts scanning…”
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Monolithic InGaN Multicolor Light‐Emitting Devices by Fu, Wai Yuen, Choi, Hoi Wai

“…Given the recent surge of interest in full‐color microLED display technologies, researchers in academia and industry have been looking for feasible and…”
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High Performance Electrically‐Injected InGaN Microdisk Lasers through Simultaneous Enhancement of Optical Confinement and Overlap Factor by Fu, Wai Yuen, Cheung, Yuk Fai, Choi, Hoi Wai

“…Despite the considerable research interest in InGaN‐based microdisk lasers, owing to their unique circular geometry distinct from vertical cavity…”
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High Performance Electrically‐Injected InGaN Microdisk Lasers through Simultaneous Enhancement of Optical Confinement and Overlap Factor (Laser Photonics Rev. 18(8)/2024) by Fu, Wai Yuen, Cheung, Yuk Fai, Choi, Hoi Wai

“…Electrically‐Injected InGaN Microdisk Lasers High Q, room‐temperature lasing in InGaN microdisk lasers under electrical injection is achieved through a…”
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Surface passivation of halide perovskite nanocrystals for stable and high purity color conversion by Wang, Xianghua, Li, Wenbin, Zhao, Xudong, Fu, Jing, Zhang, Guobing, Ma, Wei, Zhang, Wen-Hua, Choi, Hoi Wai

“…Surface passivation using aminopropyl-functionalized siloxane is proposed via a post-synthesis ligand exchange reaction. The near-unity photoluminescence…”
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Strain-Induced Spectral Red-Shifting from Nanoscale Frustum Arrays Fabricated over InGaN/GaN Quantum Wells for Light-Emitting Applications by Fu, Wai Yuen, Choi, Hoi Wai

“…While spectral blue-shifting caused by nanostructuring of InGaN/GaN quantum wells has been widely reported for altering the emission color of light-emitting…”
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Enhancing Optical Confinement of InGaN Thin-Film Microdisk Lasers with Hybrid Omnidirectional Reflectors by Wang, Zhongqi, Cheung, Yuk Fai, Fu, Wai Yuen, Choi, Hoi Wai

“…The conventional GaN microdisk laser adopts an undercut structure for the optical confinement, which provides poor overlap between the whispering gallery modes…”
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