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

Research output: Contribution to journalArticle

106 Citations (Scopus)

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
Publication statusPublished - 2003 Apr 1

All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Physics and Astronomy(all)

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