Abstract
The up-conversion (UC) phosphor produced by a metal-organic decomposition (MOD) method has a multifunctional potential for use in applications such as displays and solid-state lighting. ZnO-TiO 2 composite system containing Er3+ and Yb3+ were prepared by solid state reaction method, and the composite phosphor shows bright red UC emission under 980 nm laser pumping. Two photon process was involved in the UC phenomenon of the Er, Yb:ZnO-TiO 2 phosphor. The effects of heating temperature, ZnO/TiO 2 composition and Er3+, Yb3+ concentrations on the UC emission behavior were examined. The ZnO-TiO 2 composite product sintered at 900 °C contained Zn 2 TiO 4 , TiO 2 and RE 2 Ti 2 O 7 (RE = Er3+ and Yb3+) phases and exhibited strong red emissions. The maximum emission luminescence of the UC phosphor was obtained when the mixing ratios of the base materials TiO 2 : ZnO and additive materials Yb 2 O 3 : Er 2 O 3 were 1 ∶ 1 and 0:06 ∶ 0:02, respectively. The ZnO-TiO 2 :Er3+, Yb3+ phosphor was compared to the brightest available phosphor. It suggests that ZnO-TiO 2 :Er3+, Yb3+ is a potential material for the red up-conversion phosphor.
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