光谱学与光谱分析 |
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Spectral Characteristics of Ba3SiO4Cl2∶Eu2+ Phosphor for White LED |
WANG Zhi-jun, LI Pan-lai, YANG Zhi-ping, GUO Qing-lin |
College of Physics Science & Technology, Hebei University, Baoding 071002, China |
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Abstract Ba3SiO4Cl2∶Eu2+ was synthesized by a high temperature solid state method. BaCO3 (A.R.), BaCl2 (A.R.), SiO2 (99.99%) and Eu2O3 (99.99%) were used as the raw materials. The final phase was checked with a conventional X-ray diffraction (XRD) (D/max-rA, CuKα, 40 kV, 100 mA, λ=0.154 06 nm). The spectral characteristics of the phosphors were performed by using a Hitachi F-4600 fluorescence spectrophotometer equipped with a 450 W Xe lamp. Ba3SiO4Cl2∶Eu2+ showed broad emission bands at 445 and 510 nm under the 365 nm radiation excitation. For the two emission peaks, the excitation spectra have two different spectral distributions, and the excitation peaks locate at 350 and 400 nm, respectively. The results indicate that different Eu2+ emission centres exist in Ba3SiO4Cl2. The emission intensity of the 445 and 510 nm peaks is influenced by Eu2+ doped content. With increasing its content, the emission intensity of 445 nm gradually increases, and that of 510 nm decreases. With washing the phosphor, the 445 nm emission peak disappears, and the emission spectrum has only the 510 nm emission band, and its intensity is lower than that of the original phosphor.
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Received: 2012-07-01
Accepted: 2012-10-20
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Corresponding Authors:
WANG Zhi-jun
E-mail: wangzhijunmail@yahoo.com.cn
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