Improved AlGaInP vertical emitting light-emitting diodes using direct printing

Optics Letters, Vol. 38, Issue 9, pp. 1573-1575 (2013).

Joong-Yeon Cho, Kyeong-Jae Byeon, Jin-Seung Kim, Heon Lee.

 

Department of Materials Science and Engineering, Korea University, 5-1 Anam-dong, Sungbuk-gu, Seoul, 136-713, South Korea.

 

Abstract

 

In this study, we fabricated a high-brightness AlGaInP light-emitting diode (LED) using the direct printing technique and dry etching. In general, wet etching is used for surface roughening to improve the light extraction of AlGaInP red LEDs. However, a structure fabricated by wet etching has limited height and shows a tiled cone shape after the etching process due to the AlGaInP crystal structure. These limitations reduce the light extraction of the LED. As a result, we fabricated a perfectly cone-shaped pattern with high aspect ratio using direct printing by etching to maximize the LED light extraction efficiency. Compared to the red LED with a wet-etched structure, the patterning enhanced the light output power by 12% without electrical degradation. This enhanced light output power was maintained even after the packaging process.

© 2013 Optical Society of America

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