Eu³⁺/Tb³⁺掺杂CaSrAl₂SiO₇纳米粒子的制备及发光性能研究

Synthesis and Luminescence Properties of Eu³⁺/Tb³⁺:CaSrAl₂SiO₇ Nanoparticles

采用溶胶–凝胶–高温固相合成法制备了3% Eu3+/x% Tb3+:CaSrAl2SiO7(x = 1, 2, 5, 7)纳米粉体。采用X射线衍射仪、扫描电子显微镜和分光光度计对样品性能进行测试与表征。结果表明,颗粒尺寸约为300~700 nm;在255 nm波长激发下,主要发射峰位于590 nm,613 nm分别对应Eu3+离子的5D0→7F1,5D0→7F2跃迁;同时观察到545 nm,586 nm发射峰,分别对应Tb3+的5D4→7F5, 5D4→7F4跃迁。随着Tb3+掺杂浓度增加,Eu3+离子的黄光和红光强度逐渐增强,表明Tb3+与Eu3+之间存在能量传递。

The 3% Eu3+/x% Tb3+:CaSrAl2SiO7 (x = 1, 2, 5, 7)nanoparticles were synthesized by Sol-Gel-solid re-action. The structure, photoluminescence spectra and quantum efficiency were investigated. Result indicates the scale is near 300~700 nm. Excited with 255nm, we observed two emission peaks at 590 nm, 613 nm, corresponding to the transitions of (Eu3+)5D0→7F1, 5D0→7F2. And two peaks at 545 nm and 586 nm, corresponding to the transitions of (Tb3+) 5D4→7F5, 5D4→7F4. With the increasing concentration of Tb3+, the emission intensities of yellow and red light of Eu3+ enhance together, which shows that the energy transfers form Tb3+ to Eu3+.