Y2SiO5:Ce3+荧光体的基质多面体替换及其对发光性能的调控研究

荧光材料基质的结构调制对于调控发光材料的发光性能,探索固体结构-性能关系具有重要的研究意义。本文以Y2SiO5基质为模型,分别利用Si/Al和Si/P取代,以AlO4]和PO4]四面体替换SiO4]四面体,设计合成了一系列组成为Y1.95Si1-xAlxO5-xFx∶0.05Ce3+(x=0.05,x=0.1,x=0.2,x=0.4,x=1)和Y1.95-yCaySi1-yPyO5∶0.05Ce3+(y=0,y=0.02,y=0.04,y=0.06,y=0.08,y=0.2)的荧光材料。结合X射线衍射、荧光光谱、荧光寿命等测试手段对其进行了表征分析。结果表明,在x≤0.2,y≤0.04时得到的产物能够保持Y2SiO5的结构特征,在一定的基质组成替换范围内,设计合成的样品Y1.95Si1-xAlxO5-xFx∶0.05Ce3+、Y1.95-yCaySi1-yPyO5∶0.05Ce3+能提高发光强度,发射光谱呈现蓝移现象。荧光寿命测试表明这两个系列的化合物中Ce3+所处的基质环境变化较小,Ce3+发光也未产生较大的变化。

Host Polyhedral Substitution and the Modification of the Luminescence Properties of Y2SiO5:Ce3+ Phosphor

Structural modification of the phosphor host plays a key role in the optimization of the luminescence properties of the optical materials, and it becomes the important research field for the exploration of the relationship between the solid structure and its property. The Y₂SiO₅ host is selected as the model to be substituted by the Si/Al or Si/P, and the AlO₄] and PO₄] tetragons are used to replace the SiO₄], so that a series of compounds with the chemical formula of Y_1.95SiO₅:0.05Ce³⁺, Y_1.95Si_1-xAl_xO_5-xF_x:0.05Ce³⁺ (x=0.05, x=0.1, x=0.2, x=0.4, and x=1), Y_1.95-yCa_ySi_1-yP_yO₅:0.05Ce³⁺ (y=0, y=0.02, y=0.04, y=0.06, y=0.08, and y=0.2) phosphors were designed and successfully obtained. XRD patterns showed that the diffraction peaks of both Y_1.95Si_1-xAl_xO_5-xF_x:0.05Ce³⁺ and Y_1.95-yCa_ySi_1-yP_yO₅:0.05Ce³⁺ matched well with the standard patterns of Y₂SiO₅. Photoluminescence investigations indicated that the emission intensities had been increased to a great extent compared with that of Y₂SiO₅. A slight blue-shift was also observed in the emission spectra of Y_1.95Si_1-xAl_xO_5-xF_x:0.05Ce³⁺ and Y_1.95-yCa_ySi_1-yP_yO₅:0.05Ce³⁺. Moreover, decay curves of Y_1.95Si_1-xAl_xO_5-xF_x:0.05Ce³⁺ and Y_1.95-yCa_ySi_1-yP_yO₅:0.05Ce³⁺ confirmed that there are similar chemical environment for the Ce³⁺ luminescence.