Visible green upconversion luminescence of Li+/Er3+/Yb3+ co-doped CaWO4 phosphor and effects of Yb3+ concentration
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The upconversion (UC) luminescence of Li+/Er3+/Yb3+ co-doped CaWO4 phosphors and effects of Yb3+ concentration are investigated in detail. Single crystallized CaWO4 : Li+/Er3+/Yb3+ phosphor can be obtained, co-doped up to 35.0/5.0/30.0mol% (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+ (4H11/2, 4S3/2 → 4I15/2). The optimum doping concentrations of Yb3+ that would result in the highest UC luminescence were determined, and a possible UC mechanism that depends on the pumping power is discussed in detail.
Abstract
The upconversion (UC) luminescence of Li+/Er3+/Yb3+ co-doped CaWO4 phosphors and effects of Yb3+ concentration are investigated in detail. Single crystallized CaWO4 : Li+/Er3+/Yb3+ phosphor can be obtained, co-doped up to 35.0/5.0/30.0mol% (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+ (4H11/2, 4S3/2 → 4I15/2). The optimum doping concentrations of Yb3+ that would result in the highest UC luminescence were determined, and a possible UC mechanism that depends on the pumping power is discussed in detail.
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