Photoluminescent properties of Eu3+‐Eu2+ activated MAl2SixO2x + 4 (M = Mg,Ca, Sr,Ba) phosphors prepared in air |
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| Authors: | Songchu Li Lixin Yu Xiaoqin Man Jianlin Zhong Wei Sun |
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| Affiliation: | College of Materials Science and Engineering, Nanchang University, Nanchang, P. R. China |
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| Abstract: | In this paper, MAl2SixO2x+4:Eu2+/Eu3+ (Eu2+ + Eu3+ = 2%, molar ratio; M = Mg, Ca, Sr, Ba; x = 0, 0.5, 1, 1.5, 2) phosphors with different SiO2 concentrations (the ratio of SiO2 to MAl2O4 is n%, n = 0, 50, 100, 150, 200, respectively) were prepared by high‐temperature solid‐state reaction under atmospheric air conditions. Their structures and photoluminescent properties were systematically researched. The results indicate that Eu3+ ions have been reduced and Eu2+ ions are obtained in air through the self‐reduction mechanism. The alkaline earth metal ions and doping SiO2 strongly affect the crystalline phase and photoluminescent properties of samples, including microstructures, relative intensity of Eu2+ to Eu3+, location of emission lines/bands. It is interesting and important that the emission color and intensities of europium‐doped various phosphors which consist of aluminosilicate matrices prepared under atmospheric air conditions could be modulated by changing the kinds of alkaline earth metal and the content of SiO2. |
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| Keywords: | alkaline earth metal ions Eu2 + photoluminescent self‐reduction SiO2 concentrations |
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