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

Jinn-Kong Sheu, Shoou-Jinn Chang, C. H. Kuo, Y. K. Su, L. W. Wu, Yu-Cheng Lin, Wei-Chi Lai, J. M. Tsai, G. C. Chi, R. K. Wu

Research output: Contribution to journalArticlepeer-review

622 Citations (Scopus)

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
Publication statusPublished - 2003 Jan

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering

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