Enhancement of light extraction for InGaN LEDs by means of beveled sapphire and cup-shaped copper sheeting

Ray-Hua Horng*, Hung Lieh Hu, Sin Liang Ou, Re Ching Lin, Chen Peng Hsu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

In this letter, InGaN light-emitting diode (LED) structures fabricated with beveled sapphire substrates and embedded in cup-shaped copper sheets are presented. Using Trace-Pro simulation, the shaped sapphire with an optimum beveled angle of 75° was determined to enhance the light extraction of LEDs. The thermal dissipation for high power LEDs can be improved by embedding them in cup-shaped copper sheets. At an injection current of 350 mA, the output powers of LED with conventional structure and LEDs with original and beveled sapphires, both embedded in cup-shaped copper sheets, are 325.4, 372.6, and 395.6 mW, respectively, while the power efficiencies are 27.6%, 31.5%, and 33.3%, respectively. It indicates that the light extraction and output power of LED devices can be enhanced with the aid of beveled sapphires and cup-shaped copper sheets.

Original languageEnglish
Article number6213501
Pages (from-to)1421-1423
Number of pages3
JournalIEEE Photonics Technology Letters
Volume24
Issue number16
DOIs
StatePublished - 9 Aug 2012

Keywords

  • Beveled sapphire
  • cup-shaped copper sheet
  • InGaN
  • light extraction
  • light-emitting diode (LED)

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