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 Jan 1
Externally publishedYes

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Phosphors
phosphors
Light emitting diodes
Photoluminescence
light emitting diodes
photoluminescence
preparation
Wavelength
Solid state reactions
wavelengths
Powders
Phosphorus
phosphorus
Luminescence
Quenching
phosphates
Phosphates
quenching
luminescence
solid state

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

Cite this

Preparation and photoluminescence properties of γ-KCaPO4 : Eu2+ phosphors for near UV-based white LEDs. / Yim, Dong Kyun; Cho, In Sun; Lee, Chan Woo; Noh, Jun Hong; Roh, Hee Suk; Hong, Kug Sun.

In: Optical Materials, Vol. 33, No. 7, 01.01.2011, p. 1036-1040.

Research output: Contribution to journalArticle

Yim, Dong Kyun ; Cho, In Sun ; Lee, Chan Woo ; Noh, Jun Hong ; Roh, Hee Suk ; Hong, Kug Sun. / Preparation and photoluminescence properties of γ-KCaPO4 : Eu2+ phosphors for near UV-based white LEDs. In: Optical Materials. 2011 ; Vol. 33, No. 7. pp. 1036-1040.
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AU - Hong, Kug Sun

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