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The present study explores the enhanced visible frequency upconversion emissions in the Ho3+-Yb3+ codoped Gd2O3 phosphors prepared by combustion technique. The green colour emission capability with relatively low red and NIR emissions has been confirmed under 980 nm continuous wave (CW) laser diode excitation. Three upconversion emission transitions (5F4, 5S2 →5I8, 5F5→ 5I8 and 5F4, 5S2 →5I7) has...
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