NDLI: Study of GaN-based light-emitting diodes with double roughened surfaces

Content Provider	IEEE Xplore Digital Library
Author	Lianqiao Yang Jianzheng Hu Jianhua Zhang
Copyright Year	2011
Description	Author affiliation: Key Laboratory of Advanced Display and System Applications (Shanghai University), Ministry of Education. P.O.B 143, 49 Yanchang Rd., Shanghai University, Shanghai 200072, P. R. China (Lianqiao Yang) \|\| Institute of RD Group, Rainbow Optoelectronics Material Shanghai Co. Ltd. (Jianzheng Hu) \|\| Key Laboratory of Advanced Display and System Applications (Shanghai University), Ministry of Education. P.O.B 143 (Jianhua Zhang)
Abstract	In this paper, GaN-based blue light emitting diodes with double roughened surfaces were fabricated and compared with planar LEDs and these with single roughened layer. The double roughened surfaces were fulfilled by patterned sapphire substrates (PSS) and roughened p-GaN surface. Magnesium treatment during the growth process was used to produce p-GaN surface roughening. After the epitaxial growth, the four group samples were fabricated using the standard process (four mask steps) with a mesa area of 10×23 mil2. At last, 25 LED devices were packaged for each group using the same packaging material and by the same method. It was found that import of PSS and roughened p-GaN surface may lead to a little higher voltage by simply copying the epitaxial process of planar LED. However, even fabricated by the non-optimized epitaxial process, comparing with planar LEDs, the optical power of the package can be increased by 40.1% by using the patterned sapphire substrate, 10.2% by using p-GaN surface roughing, and 44.9% by using double roughing technologies.
Starting Page	1
Ending Page	3
File Size	948902
Page Count	3
File Format	PDF
ISBN	9781457717703
e-ISBN	9781457717697
e-ISBN	9781457717680
DOI	10.1109/ICEPT.2011.6066940
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-08-08
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Light emitting diodes Surface roughness Rough surfaces Surface treatment Substrates Gallium nitride Optical device fabrication
Content Type	Text
Resource Type	Article

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