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In this paper, we synthesized Er3+-doped Zinc oxide nanocrystals by conventional sol-gel method under 800°C, and further mesoporous-like structure was obtained through post-annealing procedure at 1300°C. Upconversion intensity was significantly enhanced by post-annealing, and the emission color was turned into relatively high purity red color (ratio of red to green emission is over 10). In addition,...
Wide range concentrations of Er3+ doped NaYF4 nanocrystals are synthesized. Upconversion mechanisms are discussed under 976nm NIR laser excitation on the basis of the fluorescence spectra and lifetimes data of Er3+. It is found that the heat induced by incident laser results in an evident increase of the slope of emission from 2H11/2 energy level in the pump power dependence. Emission color of samples...
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