Improved AlGaInP vertical emitting light-emitting diodes using direct printing

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

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)1573-1575
Number of pages3
JournalOptics Letters
Issue number9
Publication statusPublished - 2013 May 1

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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