Tunable photoluminescence properties of Sr1‐yCayMoO4:Sm3+ phosphors (0 ≤ y < 1) |
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Authors: | Renping Cao Kangbin Chen Pan Liu Chunyan Cao Yongchun Xu Hui Ao Pengjie Tang |
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Affiliation: | 1. College of Mathematics and Physics, Jinggangshan University, Ji'an, China;2. Scientific Research Office, Jinggangshan University, Ji'an, China |
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Abstract: | A series of Sr1‐x‐yCayMoO4:xSm3+ (0 ≤ x ≤ 7 mol% and 0 ≤ y < 1) phosphors was synthesized by a conventional solid‐state reaction method in air, and their structural and spectroscopic properties were investigated. The optimal doping concentration of Sm3+ in SrMoO4:Sm3+ phosphor is 5 mol%. Under excitation with 275 nm, in Sr1‐x‐yCayMoO4:xSm3+ (0 ≤ x ≤ 7 mol% and 0 ≤ y < 1) phosphors, the emission band of the host was found to overlap with the excitation bands peaking at ~500 nm of Sm3+ ion, and the energy transfer from MoO42? group to Sm3+ ion can also be observed. The International Commission on Illumination (CIE) chromaticity coordinates of Sr0.95‐yCayMoO4:0.05Sm3+ phosphors with excitation 275 nm varied systematically from an orange (0.4961, 0.3761) (y = 0) to a white color (0.33, 0.3442) (y = 0.95) with increasing calcium oxide (CaO) concentration. However, Sr0.95‐yCayMoO4:0.05Sm3+ phosphors with excitation at 404 nm only showed red emission and the energy transfer between MoO42? group to Sm3+ ion was not observed. The complex mechanisms of luminescence and energy transfer are discussed by energy level diagrams of MoO42? group and Sm3+ ion. Copyright © 2015 John Wiley & Sons, Ltd. |
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Keywords: | Sm3+ ion energy transfer tunable photoluminescence |
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