采用溶胶凝胶法合成CaYAl1-xO4∶xMn4+红色荧光粉, 用差热热重分析仪(DSC-TGA)、X射线粉末衍射仪(XRD)、透射电镜(TEM)以及荧光分光光度计对荧光粉进行结构和性能的表征, 研究合成温度、反应时间及Mn4+掺杂浓度对CaYAl1-xO4∶xMn4+发光性能的影响。研究结果表明, 在335 nm光激发下, 荧光粉发射660～780 nm范围的红光, 归属于Mn4+的2Eg→4A2g能级跃迁。在712 nm光监测下, 样品呈现两组激发宽峰, 分别归属于Mn4+离子的4A2g→4T1g(335 nm)和4A2g→4T2g(475 nm)能级跃迁。当煅烧温度为1 200 ℃、反应时间为6 h和Mn4+的掺杂摩尔分数为0.5%时, CaYAl1-xO4∶xMn4+的发光强度最大。

CaYAl1-xO4∶xMn4+ red phosphors were prepared by sol-gel method. Differential thermal and thermogravimetric analysis (DSC-TGA), X-ray powder diffraction (XRD), transmission electron microscopy (TEM) and photoluminescence spectrophotometer were utilized to characterize the samples. The effects of the factors, such as synthesis temperature, reaction time and concentration of Mn4+ on the luminescent properties of the phosphors were studied. The samples give red emissions centered at 660－780 nm under 335 nm excitation, which correspond to 2Eg→4A2g transition of Mn4+. The excitation spectrum monitored by 712 nm consists of two broad excitation bands resulting from 4A2g→4T1g (335 nm) and 4A2g→4T2g (475 nm) transition of Mn4+. The maximum luminescent intensity of CaYAl1-xO4∶xMn4+ phosphors can be obtained with x=0.005 under calcination at 1 200 ℃ for 6 h.