Investigation of InGaN/GaN power chip light emitting diodes with TiO 2/SiO2 omnidirectional reflector

H. W. Huang, C. H. Lin, C. C. Yu, B. D. Lee, Hao-Chung Kuo, K. M. Leung, S. C. Wang

Research output: Contribution to journalArticle

9 Scopus citations

Abstract

Enhancements of light extraction of GaN-based power chip (PC) LEDs with and without rough surface on p-GaN and TiO2/SiO2 omnidirectional reflector (ODR) on the bottom are presented. Motivated by phosphor-conversion white light applications, the peak-emitting wavelength of our studied PC LEDs is chosen to be 455 nm and the fabricated ODR is designed for the same wavelength regime. At a driving current of 350 mA and a chip size of 1 mm × 1 mm on a TO-can package, the light output power of the PC LED with ODR on the bottom and pit type of rough surface on p-GaN is enhanced by 67% when compared with the same device without ODR and rough surface. Furthermore, by examining the radiation patterns, the PC LED with the ODR and rough surface shows stronger enhancement around the vertical direction. Our results provide promising potential to increase output powers of commercial light emitting devices, especially for white light applications.

Original languageEnglish
Article number125006
JournalSemiconductor Science and Technology
Volume23
Issue number12
DOIs
StatePublished - 1 Dec 2008

Fingerprint Dive into the research topics of 'Investigation of InGaN/GaN power chip light emitting diodes with TiO <sub>2</sub>/SiO<sub>2</sub> omnidirectional reflector'. Together they form a unique fingerprint.

  • Cite this