Abstract
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 4 S 3/2 and 4 F 9/2 levels of Er3+: BaTiO3 nanocrystals. It is found that at 850 mW of cw excitation power (at 980 nm) the total luminescence was 17130 Cd/m2 for 1000°C heated 0.25 mol% Er-doped BaTiO3 nanocrystals. It is worthwhile to mention that the unusual power-dependent upconversion luminescence (saturation) is observed at higher dopant concentration (2.5 mol%) and high pump power. Our analysis confirms that the depletion of the excited state is responsible for the relevant fluorescence upconversion. We have again confirmed that a twophoton excited state absorption process occurs for all samples.
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Ghosh, P., Sadhu, S., Sen, T. et al. Upconversion emission of BaTiO3: Er nanocrystals. Bull Mater Sci 31, 461–465 (2008). https://doi.org/10.1007/s12034-008-0072-7
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DOI: https://doi.org/10.1007/s12034-008-0072-7