Improved output power of nitride-based light-emitting diodes with convex-patterned sapphire substrates

Yu Ting Hsu*, Cheng Chang Yu, Kai-Feng Huang, Wen How Lan, Jing En Huang, Jia Ching Lin, Wen Jen Lin

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

Nitride-based light-emitting diodes (LEDs) grown on different convex-patterned sapphire substrates are proposed and fabricated. The electrical and optical properties of these LEDs are discussed in detail. It is found that the LED with a ball-shape patterned sapphire substrate has the best crystalline quality and IV characteristic. On the other hand, on reducing total internal reflection, the LED with hexagonalshape patterned sapphire substrate (HPSS) has the best performance on output power and external quantum efficiency. In comparison to the LED without patterned substrate, the LED with HPSS has 175% and 165% enhancement on output power and external quantum efficiency, respectively.

Original languageEnglish
Article number6269053
Pages (from-to)1686-1688
Number of pages3
JournalIEEE Photonics Technology Letters
Volume24
Issue number19
DOIs
StatePublished - 24 Sep 2012

Keywords

  • External quantum efficiency (EQE)
  • Light-emitting diodes (LEDs)
  • Patterned sapphire substrate (PSS)

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