Spectral Properties and Energy Transfer of Ce3+ and Eu2+ Ions Co-Doped Ba2SiO4∶xCe3+,0.02Eu2+ Green Phosphor for White LEDs
LIU Hong-li, HE Da-wei*, SHEN Fang
Ministry of Education Key Lab of Materials for Information Storage and Display, Institute of Photoelectron Technology, Beijing Jiaotong University, Beijing 100044, China
Abstract：In the present paper, Ce3+ and Eu2+ co-doped silicate Ba2SiO4∶xCe3+,0.02Eu2+ green-emitting phosphors were synthesized by conventional solid-state reaction in a CO-reductive atmosphere. The diffuse reflection spectra, excitation spectra, and emission spectra of Ba2SiO4∶xCe3+, 0.02Eu2+ were measured and studied. Due to the good overlap between the Ce3+ emission bands and the Eu2+ excitation bands, the energy transfer between Ce3+ and Eu2+ is expected to be very efficient and is confirmed by the emission spectra of Ba2SiO4∶xCe3+,0.02Eu2+. Co-doped Ba2SiO4∶xCe3+,0.02Eu2+ is efficient green phosphors with the excitation of longer wavelength UV light, and the emission intensity is stronger than Eu2+ doped Ba2SiO4 phosphors. Analyzing the spectra, the authors draw a conclusion that the luminescence sensitization of Eu2+ by Ce3+ in Ba2SiO4∶xCe3+, 0.02 Eu2+ is due to the efficient energy transfer from Ce3+ to Eu2+ under long UV light.
Key words：Ce3+ and Eu2+;Silicate;Sensitization;Energy transfer
刘红利，何大伟*,沈芳. Ba2SiO4荧光粉中Ce3+和Eu2+的光谱性质和能量传递[J]. 光谱学与光谱分析, 2006, 26(10): 1790-1793.
LIU Hong-li, HE Da-wei*, SHEN Fang. Spectral Properties and Energy Transfer of Ce3+ and Eu2+ Ions Co-Doped Ba2SiO4∶xCe3+,0.02Eu2+ Green Phosphor for White LEDs . SPECTROSCOPY AND SPECTRAL ANALYSIS, 2006, 26(10): 1790-1793.
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