Enhanced Extraction and Efficiency of Blue Light-Emitting Diodes Prepared Using Two-Step-Etched Patterned Sapphire Substrates, Lin, Ray-Ming, Lu, Yuan-Chieh, Yu, Sheng-Fu, Wu, YewChung Sermon, Chiang, Chung-Hao, Hsu, Wen-Ching, Chang, Shoou-Jinn
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Lin et al. (2009) studied this question.
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