Characteristics of up-conversion phosphor prepared using the MOD method

It is possible to form oxides of many materials by air sintering after coating the substrate with a metal-organic decomposition (MOD) solution, thus enabling the preparation of thin films by means of simple processes such as spin coating. MOD solutions of titanium oxide, zinc oxide, ytterbium oxide, and erbium oxide were used in this study. A mixture of Ti : Zn : Yb : Er was made by mixing the components at an arbitrary ratio, and after coating the substrate with the mixture, the sample was heated in air for 4 h at 1000 °C. The maximum value of the emission luminance of up-conversion (UC) phosphor was obtained when the mixing ratio of the base materials TiO₂ : ZnO was 1 : 1. The emission intensity of UC could be controlled by varying the mixing ratio of rare earth content. UC phosphor produced by the MOD method has multifunctional potential such as for displays and solid-state lighting.