Effects of Ho 3+ concentration on the photoluminescence of the ZnO Up-conversion films

• DOI: 10.1016/j.cplett.2017.03.083
• Publication Date: 2017-03-31T13:15:16Z
• Authors: Danping Wang; Xiaoqi Meng; Boxu Xu; Kaishun Zou; Changjiang Zhao; Juncheng Liu
• Keywords: Wurtzite crystal structure; Spin Coating; Emission intensity; Green-light

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 (800–1250 nm) wavelengths decreased at first and then increased, and the lowest value appeared when the concentration of Ho 3+ was 7 mol%. There were two intense emission bands in the up-conversion emission spectrum, namely the 545 nm green light and the 660 nm red light. The up-conversion luminescence intensity of the films increased at first and then declined, and the maximum was at 7 mol%.