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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...
To improve the efficiency of photoluminescent films, this study investigates the effects of the Ho3+/Yb3+ concentration ratio on the structure and up-conversion photoluminescence of ZnO films prepared by the sol–gel method and the spin-coating technique. ZnO maintained its hexagonal wurtzite structure after doping with rare earth ions. The ZnO films consist of round granules, the average size of which...
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