上转换材料LiLa(MoO_4)_2:Yb^(3+),Er^(3+)(Tm^(3+))的制备及其光谱性质测定

SYNTHESIS AND UPCONVERSION PROPERTIES OF LiLa(MoO_4)_2:Yb^(3+),Er^(3+)(Tm^(3+))

采用溶胶-凝胶法制备了上转换材料LiLa(MoO4)2:Yb3+,Er3+(Tm3+),并对其进行了X射线衍射分析以及荧光光谱测定.在980 nm红外激光器激发下,LiLa(MoO4)2:Yb3+,Er3+发出波长为530 nm和550 nm的绿色可见光,而LiLa(MoO4)2:Yb3+,Tm3+发出波长为475 nm的蓝色可见光.对Yb3+/Er3+和Yb3+/Tm3+双掺体系的上转换发光机理进行了探讨,其中Er3+发出绿色上转换光的过程为双光子过程,而Tm3+发出蓝色上转换光的过程为三光子过程.

Upconversion materials LiLa（ MoO4 ） 2 ： Yb3^ ＋ , Er^3＋ （ Tm^3 ＋） were synthesized by the sol-gel method. The as-prepared samples were characterized by the X-ray diffraction and the upconversion luminescence spectra were recorded by a spectrophotometer. Under a 980 nm semiconductor laser excitation, green upconversion emissions of LiLa （MoO4 ）2：Yb^3＋ , Er^3＋ at 530 nm and 550 nm can be observed, while the blue emission of LiLa（MoO4）2：Yb^＋3 , Tm^3＋at 475 nm can be seen by naked eye. Moreover, the upconversion mechanisms is discussed in our paper, the upconversion luminescences of Er^3＋ and Tm^3＋ are produced through a two-photon and a three-photon process, respectively.