n-UV+blue/green/red white light emitting diode lamps

Cheng-Huang Kuo*, Jinn Kong Sheu, Shoou Jinn Chang, Yan Kuin Su, Liang Wen Wu, Ji Ming Tsai, C. H. Liu, R. K. Wu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

106 Scopus citations

Abstract

Phosphor-conversion light-emitting diode (LED) lamps were fabricated by precoating blue/green/red phosphors onto near-ultraviolet (n-UV) LED chips prior to packaging them into LED lamps. With a 20 mA injection current, it was found that the color temperature, Tc, was approximately 5900 K, the color rendering index, Ra, was approximately 75, and the CIE color coordinates were x = 0.33 and y = 0.35 for the "n-UV+blue/green/red" white LED lamps. No obvious changes in color temperature, Tc, or color-rendering index, Ra, could be observed when we increased the injection from 20 mA to 60 mA. These results indicate that such "n-UV+blue/green/red" white LED lamps are much more optically stable than the conventional "blue+yellow" LED lamps.

Original languageEnglish
Pages (from-to)2284-2287
Number of pages4
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume42
Issue number4 B
DOIs
StatePublished - 1 Apr 2003

Keywords

  • Color temperature
  • Color-rendering index
  • LED
  • Phosphor
  • White light

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