White-light emission from near UV InGaN-GaN LED chip precoated with blue/green/red phosphors

J. K. Sheu*, S. J. Chang, Cheng-Huang Kuo, Y. K. Su, L. W. Wu, Y. C. Lin, W. C. Lai, J. M. Tsai, G. C. Chi, R. K. Wu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

681 Scopus citations

Abstract

Phosphor-converted light-emitting diodes (LEDs) were fabricated by precoating blue/green/red phosphors onto near ultraviolate (n-UV) LED chips prior to package into LED lamps. With a 20-mA injection current, it was found that the color temperature Tc was around 5900 K and the color-rendering index Ra was around 75 for the "n-UV+blue/green/red" white LED lamps. It was also found that no changes in color temperature Tc color-rendering index Ra could be observed when we increased the injection from 20 to 60 mA. These results indicate that such "n-UV+blue/green/red" white LEDs are much more optically stable than the conventional "blue+yellow" LEDs.

Original languageEnglish
Pages (from-to)18-20
Number of pages3
JournalIEEE Photonics Technology Letters
Volume15
Issue number1
DOIs
StatePublished - Jan 2003

Keywords

  • Color temperature
  • Color-rendering index
  • GaN
  • Phosphor
  • White-light light-emitting diode (LED)

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