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

doi:10.1016/j.optmat.2011.02.031

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 journal › Article › peer-review

34 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 language	English
Pages (from-to)	1036-1040
Number of pages	5
Journal	Optical Materials
Volume	33
Issue number	7
DOIs	https://doi.org/10.1016/j.optmat.2011.02.031
Publication status	Published - 2011 May
Externally published	Yes

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

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.",

keywords = "Concentration quenching, Phosphate phosphor, Photoluminescence, White LEDs",

author = "Yim, {Dong Kyun} and Cho, {In Sun} and Lee, {Chan Woo} and Noh, {Jun Hong} and Roh, {Hee Suk} and Hong, {Kug Sun}",

note = "Funding Information: This work was partly supported by the IT R&D program of MKE/IITA [2009-F-020-01, Development of Red nitride phosphor and self-assembly phosphorescent layer packaging technology for high rendition LED illumination] and Strategic Technology Development Project of the Ministry of Knowledge Economy (10031821). ",

year = "2011",

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doi = "10.1016/j.optmat.2011.02.031",

language = "English",

volume = "33",

pages = "1036--1040",

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T2 - Eu2+ phosphors for near UV-based white LEDs

AU - Yim, Dong Kyun

AU - Cho, In Sun

AU - Lee, Chan Woo

AU - Noh, Jun Hong

AU - Roh, Hee Suk

AU - Hong, Kug Sun

N1 - Funding Information: This work was partly supported by the IT R&D program of MKE/IITA [2009-F-020-01, Development of Red nitride phosphor and self-assembly phosphorescent layer packaging technology for high rendition LED illumination] and Strategic Technology Development Project of the Ministry of Knowledge Economy (10031821).

PY - 2011/5

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N2 - 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.

AB - 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.

KW - Concentration quenching

KW - Phosphate phosphor

KW - Photoluminescence

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