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Preparation and photoluminescence properties of γ-KCaPO4: Eu phosphors for near UV-based white LEDs |
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| Authors: | Dong Kyun YimIn-Sun Cho Chan Woo LeeJun Hong Noh Hee Suk RohKug Sun Hong |
| Affiliation: | a WCU Hybrid Materials Program, Department of Materials Science and Engineering, College of Engineering, Seoul National University, Seoul 151-744, Republic of Korea b Research Institute of Advanced Materials (RIAM), Seoul National University, Seoul 151-744, Republic of Korea c Department of Mechanical Engineering, Stanford University, California 94305, United States |
| 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: | Phosphate phosphor KCaPO4 Photoluminescence Concentration quenching White LEDs |
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