发光学报, 2013, 34 (4): 395, 网络出版: 2013-04-23
单一基质白色荧光粉Ca9Al(PO4)7∶Ce3+,Dy3+的制备与发光性能
Synthesis and Luminescent Properties of The Single White Emitting Phosphor Ca9Al(PO4)7∶Ce3+,Dy3+
白色荧光粉 发光 色坐标 Ca9Al(PO4)7∶Ce3+ Ca9Al(PO4)7∶Ce3+ Dy3+ Dy3+ white emitting phosphor luminescence color coordinate
摘要
采用高温固相法在还原气氛下合成了Ca9(1-x-y)Al(PO4)7∶xCe3+,yDy3+荧光材料, 并对其发光特性进行了研究。XRD测试表明所合成样品为纯相Ca9Al(PO4)7晶体。在268 nm紫外光激发下, Ca9Al(PO4)7∶Ce3+呈现峰值位于363 nm的宽带发射。在350 nm近紫外光激发下, Ca9Al(PO4)7∶Dy3+发射光谱为窄带谱, 主峰分别位于483 nm和574 nm, 对应Dy3+的4F9/2→6H15/2和4F9/2→6H13/2特征跃迁, 呈黄白光发射。荧光光谱表明:Ce3+, Dy3+共掺之后, Ce3+不仅对Dy3+的特征发射有明显的敏化作用, 而且通过调节Ce3+和Dy3+的掺杂比例, 可实现从黄白光到白光的颜色变化。研究发现:Ca9(1-x-y)Al(PO4)7∶xCe3+,yDy3+样品中, 掺杂离子的最佳摩尔分数为x=0.02, y=0.02, 此时色坐标为(0.306, 0.313)。
Abstract
Phosphors Ca9(1-x-y)Al(PO4)7∶xCe3+,yDy3+ were synthesized by solid-state reaction method at high temperature under a reducing atmosphere of CO, and the luminescent properties of the phosphors were investigated. The X-ray diffraction patterns (XRD) show that a pure phase of Ca9Al(PO4)7 phosphor has been obtained after calcined at 1 200 ℃. Under 268 nm excitation, the Ca9Al(PO4)7∶Ce3+ sample exhibits a broad emission band centered at 363 nm. The emission spectrum of Ca9Al(PO4)7∶Dy3+ sample under 350 nm excitation shows two characteristic emissions of Dy3+ located at 483 nm and 574 nm, corresponding with 4F9/2→6H15/2 and 4F9/2→6H13/2 transition, respectively. According to the fluorescence spectra, the characteristic emissions of Dy3+ are significantly sensitized by Ce3+ when the Ca9Al(PO4)7 samples are co-doped with Ce3+ and Dy3+. Adjusting the concentration of Ce3+ and Dy3+, the color of the phosphors can change from yellowish-white to white. The results indicate that the optimal mole fractions of Ce3+ and Dy3+in Ca9(1-x-y)Al(PO4)7∶xCe3+,yDy3+ are x=0.02 and y=0.02, and the chromaticity coordinate is (0.306, 0.313).
杨志平, 吕梁, 刘鹏飞, 赵引红, 王灿, 刘利鹏. 单一基质白色荧光粉Ca9Al(PO4)7∶Ce3+,Dy3+的制备与发光性能[J]. 发光学报, 2013, 34(4): 395. YANG Zhi-ping, LYU Liang, LIU Peng-fei, ZHAO Yin-hong, WANG Can, LIU Li-peng. Synthesis and Luminescent Properties of The Single White Emitting Phosphor Ca9Al(PO4)7∶Ce3+,Dy3+[J]. Chinese Journal of Luminescence, 2013, 34(4): 395.