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- W2077320891 abstract "The effect of annealing on the upconversion luminescence of ZnO:Er3+ nanocrystals was investigated in detail. The green and the red upconverted emissions under infrared 978-nm light excitation were remarkably enhanced with an increase of annealing temperature. Moreover, for the sample annealed at 500 °C, the ratio of the intensity of 2H11/2 → 4I15/2 emission to that of 4S3/2 → 4I15/2 emission increased from less than to more than unity with an increase of the excitation density. However, the same case did not occur to the sample annealed at 700 °C, where the ratio was independent of excitation density except when the excitation density was higher than 42 700 W/cm2. This distinction was attributed mainly to the difference in energy gap between the 2H11/2 and 4S3/2 states in the two samples, originating from the local microstructure variation around Er3+ ions. In addition, a high thermal sensitivity of 0.0062/°C was obtained in the ZnO:Er3+ nanocrystals based on the temperature-dependent fluorescence intens..." @default.
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- W2077320891 date "2007-09-21" @default.
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- W2077320891 title "Effect of Annealing on Upconversion Luminescence of ZnO:Er<sup>3+</sup> Nanocrystals and High Thermal Sensitivity" @default.
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- W2077320891 doi "https://doi.org/10.1021/jp0686689" @default.
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