Sol–gel preparation and luminescent properties of red‐emitting phosphor Sr‐Ba‐Mo‐W‐O‐(Eu3+,Sm3+) |
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| Authors: | Fei Li Huidong Xie Haihong Xi Xiaochang Wang |
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| Institution: | 1. School of Science, Xi'an University of Architecture and Technology, Xi'an, China;2. Key Laboratory of Northwest Water Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, Xi'an, China |
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| Abstract: | Two series of red‐emitting phosphors Sr‐Ba‐Mo‐W‐O:Eu,Sm and Sr‐Ba‐Mo‐W‐O:Eu have been synthesized by a sol–gel method. The effects of the chemical composition, concentrations of Sm3+ and Eu3+, the Sr2+/Ba2+ ratio, and the W6+/Mo6+ ratio on the luminescent properties were investigated. The as‐prepared phosphors were characterized by X‐ray diffraction and Raman spectra. Results showed that single phases of the two series were prepared. The compositions of Sr0.6Ba0.13Mo0.8 W0.2O4:Eu0.10Sm0.08 and Sr0.75Ba0.1Mo0.8 W0.2O4:Eu0.10 had the strongest luminescent intensity. The excitation spectra of Sm3+, Eu3+ co‐doped phosphors were broader and the strongest peak moved to 404 nm when compared with that of Eu3+ single‐doped phosphors. The luminescent intensity of the Sr0.6Ba0.13Mo0.8 W0.2O4:Eu0.10Sm0.08 at 618 nm were 2.8 times greater than that of Sr0.75Ba0.1Mo0.8 W0.2O4:Eu0.10. The luminescent intensity of Sr0.6Ba0.13Mo0.8 W0.2O4:Eu0.10Sm0.08 and Sr0.75Ba0.1Mo0.8 W0.2O4:Eu0.10 at 150 °C decreased to 56.8% and 50.3% of the initial value at room temperature, respectively. Copyright © 2015 John Wiley & Sons, Ltd. |
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| Keywords: | phosphors LED luminescence |
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