Photoluminescence of SrGa2S4:Sn,Re(=Ce, Gd) phosphors |
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Authors: | Mutsumi Nagata Katsu Tanaka Hisashi Kawasaki |
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Affiliation: | a Department of Materials Science and Engineering, Tokyo Denki University, 2-2, Kandanishiki-cho, Chiyoda-ku, Tokyo 101-8457, Japan b NHK Science and Technical Research Laboratories, 1-10-11, Kinuta, Setagaya-ku, Tokyo 157-8510, Japan |
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Abstract: | The photoluminescence (PL) spectra, PL excitation spectra, color coordinates, and X-ray diffraction spectra are reported for SrGa2S4:Sn,Re(=Ce and Gd, respectively) phosphors. By mixing SrGa2S4:Sn,Ce phosphors with different Ce3+ concentrations, white emissions can be obtained under the excitation of a 340-nm UV LED. Emissions in the green to yellow color range can be obtained from SrGa2S4:Sn,Gd phosphors. The rare earth ions enhance the green emission band, which peaks at 534 nm, instead of the yellow one. The origin of this enhancement is discussed. The resonant energy transfer rates are estimated in the cases from Ce3+ to the green and yellow centers of Sn2+ and between the yellow centers and the green centers. |
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Keywords: | SrGa2S4:Sn Rare earth ion Photoluminescence Phosphor Energy transfer White LED |
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