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. 2016 May 4;6:24884. doi: 10.1038/srep24884

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Four possible models of energy transfer mechanisms for the Pr³⁺ → Yb³⁺ pairs (a), photoluminescence spectra (b) and LPL (c) spectra of Ca₂Ga₂GeO₇:Pr³⁺,Yb³⁺ by UV lamp irradiation.