Title: Enhanced Performance of LEDs Using Periodic Tent-Like Post Patterns on A-plane Sapphire Substrates
Authors: Lin, Bo-Wen
Chang, Chung-Cheng
Hsieh, Cheng-Yu
Wang, Bau-Ming
Wu, YewChung Sermon
Hsu, Wen-Ching
Department of Materials Science and Engineering
Keywords: A-plane;light-emitting diode (LED);sapphire
Issue Date: 1-Dec-2011
Abstract: Periodic tent-like post patterns on a-plane sapphire substrates were fabricated using a two-step etching process. They were denoted as a-plane dot pattern sapphire substrate (ADPSS). Compared with the GaN-based light-emitting diode (LED) grown on a-plane sapphire without any pattern (AFlat), the ADPSS-LED has higher output power, light extraction efficiency (LEE), and external quantum efficiency (EQE), and better crystal quality. The output power of ADPSS-LED was 9.6 mW, which was 68.4% larger than the AFlat-LED. In addition, the blue shift of ADPSS-LED was found to be less than that of AFlat-LED.
URI: http://dx.doi.org/10.1109/LPT.2011.2167677
ISSN: 1041-1135
DOI: 10.1109/LPT.2011.2167677
Volume: 23
Issue: 23
Begin Page: 1772
End Page: 1774
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