上转换材料LiLa（MoO4）2：Yb^3＋，Er^3＋（Tm^3＋）的制备及其光谱性质测定

采用溶胶-凝胶法制备了上转换材料LiLa（MoO4）2：Yb^3＋,Er^3＋（Tm^3＋）,并对其进行了X射线衍射分析以及荧光光谱测定．在980nm红外激光器激发下,LiLa（MoO4）2：Yb^3＋,Er^3＋发出波长为530nm和550nm的绿色可见光,而LiLa（MoO4）2：Yb^3＋,Tm^3＋发出波长为475nm的蓝色可见光．对Yb^3＋／Er^3＋和Yb^3＋／Tm^3＋双掺体系的上转换发光机理进行了探讨,其中Er^3＋发出绿色上转换光的过程为双光子过程,而Tm^3＋发出蓝色上转换光的过程为三光子过程。     

Upconversion luminescence of Yb3+/Ho3+/Er3+/Tm3+ co-doped KGd(WO4)2 powders

Different lanthanide ions (Yb3+/Ho3+/Er3+/Tm3+) codoped KGd(WO4)2 phosphors were prepared by high-temperature solid-state reaction. The upconversion luminescence properties of two-ion and three-ion co-doped KGd(WO4)2 phosphors were investigated in detail. The concentration quenching effect of the two-ion co-doped KGd(WO4)2 phosphors was studied, and the optimum concentration of Ho3+, Er3+ and Tm3+ are 2 mol.%, 2 mol.% and 3 mol.%, respectively. The Yb3+/Ho3+/Tm3+ co-doped KGd(WO4)2 sample is the best white ...