采用高温固相法合成了适合紫外-近紫外激发的BaLa2-xZnO5∶xTb3+绿色荧光粉, 并对样品的晶格结构和发光性质进行了研究。结果表明: BaLn2ZnO5属于四方晶系, 具有空间群I4/mcm, 基本结构由LaO8、BaO10和ZnO4多面体组成。样品的激发光谱为4f75d1宽带吸收, 激发峰位于241 nm和279 nm。用279 nm紫外光源激发样品, 发射峰位于548 nm。在Tb3+掺杂量为x=0.3时发光强度最大。掺杂量x>0.03时发生浓度猝灭现象。根据能量共振理论, BaLa2-xZnO5∶xTb3+荧光粉的浓度猝灭机理是电偶极-电偶极相互作用。

A series of BaLa2-xZnO5∶xTb3+ green phosphors were synthesized by solid state reaction, and the structure and luminescence properties of the phosphors were also investigated. The results show that the ternary oxide BaLn2ZnO5 has a tetragonal structure with a space group of I4/mcm, and its basic structure consists of LaO8, BaO10 and ZnO4 polyhedra. The excitation spectra of the samples are mainly constituted by broadband peak at 241 nm and 279 nm. Under the excitation of 279 nm, the peak of emission spectra was located at 548 nm, which belongs to the f→f transition of Tb3+ ions. There exists concentration quenching in BaLa2-xZnO5∶xTb3+ phosphors, when the doping concentration x is more than 0.3. According to Dexter theory, the concentration quenching mechanism of Tb3+ in BaLa2ZnO4∶Tb3+ is the d-d interaction.