Improving optical properties of white LED fabricated by a blue LED chip with yellow/red phosphors

C. C. Lin, Y. S. Zheng, H. Y. Chen, C. H. Ruan, G. W. Xiao, R. S. Liu

Research output: Contribution to journalArticle

69 Citations (Scopus)

Abstract

White light-emitting diodes (LEDs) were fabricated by associating an InGaN-based blue LED chip with highly luminescent phosphors, Y3A l5O12:Ce3+ (YAG:Ce) and CaSiAlN3: Eu2+. The thermal stability of these phosphors, depending weakly on the composition and the activator concentration, remains high over a wide range of temperatures (25-300°C). When a mixture of YAG:Ce and CaSiAlN 3: Eu2+ was coated on a blue LED, the resultant white LED had a high luminous efficiency of νL = 68 lm/W, a high color rendering index of Ra = 93, and a color temperature of TC = 3007 K (at 50 mA). Additionally, the color coordinates, Ra and TC, of the white LED tend to remain constant against an appreciable variation in applied current.

Original languageEnglish
JournalJournal of the Electrochemical Society
Volume157
Issue number9
DOIs
Publication statusPublished - Aug 26 2010
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

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