Light extraction investigation for thin-film GaN light-emitting diodes with imbedded electrodes

Ray-Hua Horng*, Yi An Lu, Dong Sing Wuu

*Corresponding author for this work

Research output: Contribution to journalArticle

6 Scopus citations

Abstract

Light extraction in thin-film GaN light-emitting diodes (LEDs) prepared with Si substrates pretreated by surface roughening and imbedded electrodes were studied. The LEDs were fabricated with a roughened p-GaN layer, followed by epilayer transferring. There are four types of LEDs: conventional LEDs (C-LED), n-side-up thin GaN LEDs with imbedded electrodes and a KOH-roughened n-GaN (first-type LED), p-side-up thin GaN LEDs with a KOH-roughened n-GaN (second-type LED), and n-side-up thin GaN LEDs with imbedded electrodes and without KOH-roughened n-GaN (third-type LED). The electrical properties of the LEDs are almost the same. However, they differ in luminance intensity. The luminance intensities (at 350 mA) of C-LED, first-type, second-type, and third-type LEDs are 3468, 9105, 7610, and 7047 mcd, respectively. The brightest LED is first-type LED. This may be due to emission surface with pyramidal-textured surface and without light shading electrodes. They enhance the light extraction for first-type LEDs.

Original languageEnglish
Article number5621882
Pages (from-to)54-56
Number of pages3
JournalIEEE Photonics Technology Letters
Volume23
Issue number1
DOIs
StatePublished - 1 Jan 2011

Keywords

  • imbedded electrodes
  • Light extraction
  • pyramidal-textured surface
  • thin-film GaN light-emitting diodes (LEDs)

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