Preparation and photoluminescence properties of γ-KCaPO4: Eu2+ phosphors for near UV-based white LEDs

Dong Kyun Yim, In Sun Cho, Chan Woo Lee, Jun Hong Noh, Hee Suk Roh, Kug Sun Hong

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

Novel whitish-blue phosphors based on a phosphate host matrix, γ-KCaPO4: Eu2+, were prepared by a conventional solid-state reaction method using slightly phosphorus deficient conditions and their photoluminescence properties were investigated. The concentration quenching process, temperature dependence of the luminescence and decay curve were also investigated. The γ-KCaPO4: Eu2+ phosphor was efficiently excited by UV-Visible light at wavelengths of 200-450 nm and exhibited a bright whitish-blue emission with a maximum peak wavelength of 473 nm. All of these characteristics suggest that the γ-KCaPO4: Eu2+ phosphors combined with red phosphors could be applicable to near UV-based white LEDs, i.e., only two kinds of phosphor powders are needed for the formation of white light.

Original languageEnglish
Pages (from-to)1036-1040
Number of pages5
JournalOptical Materials
Volume33
Issue number7
DOIs
Publication statusPublished - 2011 May

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Keywords

  • Concentration quenching
  • Phosphate phosphor
  • Photoluminescence
  • White LEDs

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Computer Science(all)
  • Atomic and Molecular Physics, and Optics
  • Spectroscopy
  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry
  • Electrical and Electronic Engineering

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