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

摘要: 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。

Abstract: 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⁺.