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Here, we report the dopant concentration and pump-power dependence upconversion emission properties of erbium doped BaTiO3 nanocrystals derived from sol-emulsion-gel method. Green (550 nm) and red (670 nm) upconversion emissions were observed at room temperature from the 4S3/2 and 4F9/2 levels of Er3+: BaTiO3 nanocrystals. It is found that at 850 mW of cw excitation power (at 980 nm) the total...
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