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This work reports the upconversion luminescence properties of Tm 3+ /Yb 3+ ions in lead tungstate tellurite (LTT) glasses. Judd–Oflet intensity parameters have been obtained from the absorption band intensities of Tm 3+ singly-doped and Tm 3+ /Yb 3+ co-doped LTT glasses. The spontaneous emission probabilities, radiative lifetimes and branching ratios for ...
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