Abstract
The ZnO up-conversion films were prepared by sol-gel and spin-coating methods. The results showed that ZnO remained the hexagonal wurtzite structure after rare earth ions were doped. The light transmittance of the films at near-infrared (800–1250nm) wavelengths decreased at first and then increased, and the lowest value appeared when the concentration of Ho3+ was 7mol%. There were two intense emission bands in the up-conversion emission spectrum, namely the 545nm green light and the 660nm red light. The up-conversion luminescence intensity of the films increased at first and then declined, and the maximum was at 7mol%.
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