Abstract
Frequency upconversion (UC) emission in the Er3+/Yb3+/Zn2+:YMoO4 nanophosphors synthesized via chemical coprecipitation method has been reported under 980nm diode laser excitation. The intensity ratio of two closely spaced green UC emission transitions peaking at ∼531nm and ∼552nm at different temperatures has been monitored. UC emission intensity and temperature sensing capability of Er3+-Yb3+:YMoO4 nanophosphors have been greatly enhanced via Zn2+ ions incorporation and explained in terms of electronegativity, breakdown in crystal field symmetry and increase in transition probability. The sensitivity, energy transfer efficiency and population redistribution ability have also been determined.
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