Visible green upconversion luminescence of Er3+/Yb3+/Li+ co-doped CaWO4 particles |
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| Authors: | Jun Ho Chung Jung-Il Lee Sung-Lim Ryu Jeong Ho Ryu |
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| Affiliation: | 1. Department of Materials Science and Engineering, Hanyang University, Seoul 133-791, South Korea |
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| Abstract: | The upconversion (UC) luminescence of Li+/Er3+/Yb3+ co-doped CaWO4 phosphors is investigated in detail. Single crystallized CaWO4:Li+/Er3+/Yb3+ phosphor can be obtained, co-doped up to 25.0/5.0/20.0 mol% (Li+/Er3+/Yb3+) by solid-state reaction. Under 980 nm excitation, CaWO4:Li+/Er3+/Yb3+ phosphor exhibited strong green UC emissions visible to the naked eye at 530 and 550 nm induced by the intra-4f transitions of Er3+ (2H11/2,4S3/2→4I15/2). The optimum doping concentrations of Yb3+/Li+ for the highest UC luminescence were verified to be 10/15 mol%, and a possible UC mechanism that depends on the pumping power is discussed in detail. |
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