近紫外光激发黄色荧光粉Ba3Y4O9∶Dy3+的制备及发光特性

通过高温固相法合成了一系列Ba3Y4-xO9∶xDy3+荧光粉材料。利用X射线粉末衍射、荧光光谱和荧光寿命对样品进行了表征。实验表明，样品的激发光谱由一系列线状峰组成，峰值分别位于328，355，368，386，427，456，471 nm。在355 nm激发下，荧光粉在490 nm(4F9/2→6H15/2)和580 nm(4F9/2→6H13/2)处有很强的发射，发射光谱的色坐标位于黄光区域。研究了不同Dy3+掺杂浓度对样品发光性质的影响，发现样品的发光随着Dy3+浓度的增大而增强，但光谱形状基本保持不变，表明Dy3+占据了基质中低对称性的Y3+格位。当Dy3+摩尔分数x=0.08时出现发光强度猝灭现象,浓度猝灭机理为电偶极-电偶极相互作用。样品的发光寿命随着Dy3+浓度的增大逐渐减小，进一步证明了Dy3+离子之间存在着能量传递现象。Ba3Y4O9∶Dy3+荧光粉的发光位于黄光区域，有较好的热稳定性，是潜在的白光LED用荧光粉材料。

Abstract

The phosphor Ba3Y4-xO9∶xDy3+ was synthesized by traditional high-temperature solid-state reaction method. The structure and luminescence properties were characterized using X-ray powder diffraction, photoluminescence spectra (PL) and fluorescence decay time. The results indicate that the excitation spectrum includes a series of linear peaks, located at 328, 355, 368, 386, 427, 456, 471 nm． The main emission peaks were located at 490 nm(4F9/2→6H15/2)and 580 nm(4F9/2→6H13/2) under 355 nm excitation． The chromaticity coordinates of Ba3Y4O9∶Dy3+ phosphors were measured， which were in the yellow region． The effect of the doping concentration of Dy3+ was investigated, and found the samples of luminescence intensity increased with the increasing of the concentration of Dy3+, but the spectral shape basic remains the same. This indicates that Dy3+ occupies the Y3+ position of low symmetry in the matrix. The concentration quenching occurred when x=0.08 for Ba3Y4-xO9: xDy3+ phosphor and its mechanism is ascribed to dipole-dipole interaction． The decay time of the phosphor decreases with the increase of Dy3+-doped concentrations, this is further evidence that there exists a phenomenon of energy transfer between the Dy3+ ions. Ba3Y4O9∶Dy3+ phosphors are located in the yellow region and have good thermal stability.

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李佳钰, 庞然, 于湛, 刘丽艳, 李成宇. 近紫外光激发黄色荧光粉Ba₃Y₄O₉∶Dy³⁺的制备及发光特性[J]. 发光学报, 2018, 39(4): 515. LI Jia-yu, PANG Ran, YU Zhan, LIU Li-yan, LI Cheng-yu. Preparation and Luminescence Properties of Yellow Phosphors Ba₃Y₄O₉∶Dy³⁺ Excited by Near UV Light[J]. Chinese Journal of Luminescence, 2018, 39(4): 515.

近紫外光激发黄色荧光粉Ba₃Y₄O₉∶Dy³⁺的制备及发光特性

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