Performance of GaN-based light-emitting diodes fabricated using GaN epilayers grown on silicon substrates

Ray-Hua Horng, Bing Rui Wu, Ching Ho Tien, Sin Liang Ou, Min Hao Yang, Hao-Chung Kuo, Dong Sing Wuu

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

Light extraction of GaN-based light-emitting diodes grown on Si(111) substrate (GaN-on-Si based LEDs) is presented in this study. Three different designs of GaN-on-Si based LEDs with the lateral structure, lateral structure on mirror/Si(100) substrate, and vertical structure on mirror/Si(100) substrate were epitaxially grown by metalorganic chemical vapor deposition and fabricated using chemical lift-off and double-transfer techniques. Current-voltage, light output power, far-field radiation patterns, and electroluminescence characteristics of these three LEDs were discussed. At an injection current of 700 mA, the output powers of LEDs with the lateral structure on mirror/Si(100) substrate and vertical structure on mirror/Si(100) substrate were measured to be 155.07 and 261.07 mW, respectively. The output powers of these two LEDs had 70.63% and 187.26% enhancement compared to that of LED with the lateral structure, respectively. The result indicated this vertical structure LED was useful in improving the light extraction due to an enhancement in light scattering efficiency while the high-reflection mirror and diffuse surfaces were employed.

Original languageEnglish
JournalOptics Express
Volume22
Issue number1
DOIs
StatePublished - 13 Jan 2014

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