Y2Ti2O7:Tm3+的制备及其发光性能研究

采用溶胶-凝胶法(Sol-gel)制备了不同烧结温度和Tm³⁺掺杂浓度的Y₂Ti₂O₇:xTm (x=0.005,0.01,0.03,0.05)荧光粉,分别采用X射线衍射分析仪(XRD)、透射电子显微镜(TEM)和荧光光谱仪对样品的晶型结构、形貌以及发光性能进行了表征。XRD结果表明,所得到的样品为单一立方相烧绿石结构。样品在361 nm紫外光激发下发射出 蓝光,其峰值波长为456 nm,对应于Tm³⁺的¹D₂→³F₄跃迁。1 000 ℃烧结的Y₂Ti₂O₇: 0.01Tm³⁺样品具有较好的发光性能。样品在456 nm处的相对发光强度随Tm³⁺掺杂浓度的增大先升高后降低,在Tm³⁺摩尔分数为1%时达到最大,即出现了浓度猝灭现象。

Synthesis and Luminescence Properties of Y2 Ti2 O7:Tm3+ Phosphor

Y₂Ti₂O₇:xTm(x=0.005, 0.01, 0.03, 0.05) phosphors were prepared by sol-gel method and sintered at different temperatures. The structure, morphologies, and luminescence properties of samples were characterized by X-ray diffraction (XRD), TEM, and fluorescence spectrophotometer, respectively. The XRD patterns indicate that the structure of samples belongs to pyrochlore structure, and is not changed by the doping of Tm³⁺. Blue emissions centered at 456 nm, corresponding to ¹D₂→ ³F₄ transition of Tm³⁺, are detected under 361 nm excitation. The best luminescence performance is derived when the sintering temperature is 1 000 ℃ for Y₂Ti₂O₇:0.01Tm³⁺. Furthermore, the emission intensity at 456 nm increases and then decreases with the increasing of Tm³⁺ concentration. The most intense emission is obtained when the mole fraction of Tm³⁺ is 1%, which indicates that the concentration quenching happens when the mole fraction of Tm³⁺ exceeds 1%.