Novel thin-GaN LED structure adopted micro abraded surface to compare with conventional vertical LEDs in ultraviolet light

Yen Chih Chiang, Chien-Chung Lin*, Hao-Chung Kuo

*Corresponding author for this work

Research output: Contribution to journalArticle

7 Scopus citations

Abstract

In this study, novel thin-GaN-based ultraviolet light-emitting diodes (NTG-LEDs) were fabricated using wafer bonding, laser lift-off, dry etching, textured surface, and interconnection techniques. Placing PN electrodes on the same side minimized the absorption caused by electrodes in conventional vertical injection light-emitting diodes (V-LEDs) and the current spreading was improved. The light output power (700 mA) of the NTG-LEDs was enhanced by 18.3% compared with that of the V-LEDs, and the external quantum efficiency (EQE) of the NTG-LEDs was also relatively enhanced by 20.0% compared with that of a reference device. When the current operations were 1,500 mA, the enhancements of the light output power and EQE were 27.4% and 27.2%, respectively. Additionally, the efficiency droop was improved by more than 15% at the same current level.

Original languageEnglish
JournalNanoscale Research Letters
Volume10
Issue number1
DOIs
StatePublished - 1 Dec 2015

Keywords

  • Gallium nitride
  • Light-emitting diode
  • Textured surface
  • Ultraviolet
  • Vertical injection

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