Upconversion luminescence of Ca1−xHoxF2+x and Sr0.98−xEr0.02HoxF2.02+x powders upon excitation by an infrared laser von Lyapin, A A, Kuznetsov, S V, Ryabochkina, P A, Merculov, A P, Chernov, M V, Ermakova, Yu A, Luginina, A A, Fedorov, P P

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Upconversion luminescence of Ca 1− x Ho x F 2+ x and Sr 0.98− x Er 0.02 Ho x F 2.02+ x powders upon excitation by an infrared laser von Lyapin, A A, Kuznetsov, S V, Ryabochkina, P A, Merculov, A P, Chernov, M V, Ermakova, Yu A, Luginina, A A, Fedorov, P P

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