1-μm Micro-Lens Array on Flip-Chip Light-Emitting Diode
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概要
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The fabrication of hexagonally close-packed micro-lens array on sapphire face of flip-chip bonded LED by nanosphere lithography is demonstrated. Self-assembled silica spheres serve as an etch mask to transfer hemispherical geometry onto the sapphire. The optical and electrical properties are evaluated. Without degrading the current--voltage (I--V) properties, the lensed LED shows an enhancement of 27.8% on light output power, compared with unpatterned LED. The emission characteristic is also investigated by performing finite-difference time-domain simulation, which is found to be consistent with the experimental results.
- 2013-08-25
著者
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ZHANG Qian
Department of Cardiology, State Key Laboratory of Cardiovascular Disease, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences and Peking Union Medical College
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Li Kwai
Department of Electrical and Electronic Engineering, The University of Hong Kong, Hong Kong
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Choi Hoi
Department of Electrical and Electronic Engineering, The University of Hong Kong, Hong Kong
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