Zn^(2+)含量对Ca_(0.925-x)Zn_xMoO_4:Eu_(0.075)^(3+)红色荧光粉发光性能的影响

The Effect of Zn^(2+) Content on Luminescence Characteristics of Ca_(0.925-x)Zn_xMoO_4∶Eu_(0.075)^(3+) Red-emitting Phosphors

采用溶胶-凝胶法制备了Ca0.925-xZnxMoO4∶Eu30+.075红色荧光粉,并对粉体的物相结构、发光性能、粒径方面进行研究。实验得出,适量的Zn2+取代Ca2+没有改变Ca0.925MoO4∶Eu30+.075的晶体结构,而且明显提高了Ca0.925-MoO4∶Eu30+.075的发光强度。同时,掺杂Zn2+可以使红色荧光粉Ca0.925-xZnxMoO4∶Eu30+.075的电荷吸收带发生红移,Zn2+的最佳掺杂量为7%(原子分数)。对Ca0.925MoO4∶Eu30+.075和Ca0.855Zn0.07MoO4∶Eu30+.075进行对比研究,得出Ca0.855Zn0.07MoO4∶Eu30+.075的粒径稍大,但是其发光性能优于Ca0.925MoO4∶Eu30+.075。

A series of Ca0.925-xZnxMoO4 ： Eu0.075^3＋ were synthesized by sol-gel method, the crystal phase structure, luminescent properties, grain diameter of red phosphors were investigated. It was concluded that, the replacement of Zn2＋ to Ca2＋ didn＇t changed the phase structure of CaMoO4 ： Eu3＋ , but increased its emission peak intensity. Moreover, there is a red shift about the charge absorption peak of Ca0.925-xZnxMoO4 ：Eu0.075^3＋ due to the repalcement of Zn2＋ to Ca2＋. The optimum doping concentration of Zn2＋ was 7at. %. By comparing Ca0.925 MoO4 ： Eu0.075^3＋ and Ca0. 855 Zn0.07： MoO4 ： Eu0.075^3＋, it can he concluded that the luminescent properties of Ca0.855 Zn0. 07 MoO4 ： Eu0.075^3＋ is better while the parti- cle size is a little bigger than Ca0. 925 MoO4 ： Eu0.075^3＋.