溶胶-凝胶法制备Ca3Al2O6：Eu3+红色荧光粉及其发光性能

采用溶胶-凝胶法合成Ca3Al2O6：Eu3+红色荧光粉，通过XRD、SEM、荧光光谱分别对样品的结构、形貌以及发光性能进行表征，讨论煅烧温度、Eu3+掺杂浓度以及电荷补偿剂对样品发光性能的影响.结果表明：实验所得样品的结构与Ca3Al2O6相同，Eu3+掺杂并没有改变其晶体结构.合成的荧光粉在394 nm近紫外光激发下发出615 nm明亮的红光.样品的红光强度随着煅烧温度的升高先增加后减弱，最佳烧结温度为1200℃.同样红光强度也随着Eu3+掺杂浓度的增加先增加后减弱，最佳Eu3+掺杂浓度为4%（摩尔分数）.加入电荷补偿剂后样品的发光强度均增强，其中加入K+后发光增强的效果最显著.该铝酸盐红色荧光粉性质稳定，在白光LED近紫外芯片激发中具有潜在的应用.

Preparation of Ca3Al2O6:Eu3+red phosphor by sol-gel method and its photoluminescence properties

The Ca3Al2O6:Eu3+red phosphor was synthesized by sol-gel method. The structure, shape and luminous property of the sample were characterized by the XRD, SEM, and fluorescence spectrum to investigate the in-fluence of sintering temperature, Eu3+ion doping concentration, and charge compensations doping on the sam-ple. The results show that the sample′s crystal phase is the same with Ca3Al2O6 crystal structure and their crys-tal structure does not change with the invasion of Eu3+ion. The synthesized phosphor, excited by 394 nm NUV-light, emits 615 nm bright red light. The emission intensity rises first with the increasing of the sintering tem-perature and then decreases and reaches at peak when sintering temperature is 1 200 ℃. At the same time, the emission intensity of the sample increases first and then decreases with the increasing of the concentration of Eu3+ion and the optimal doping concentration of Eu3+ion is 4 mol%. Besides, the emission intensity rises with doping charge compensations which doped with K+ion has the best luminescent properties. This red phosphor of aluminates is stable, which has potential application prospect in the stimulating of White-LED′s NUV-chip.