基于改进的Pechini法制备白光LED用YAG荧光粉

摘要

对Pechini法进行了改进.使用硝酸化合物作为反应物,柠檬酸氨为螯合剂,聚丙烯酰胺为聚合剂,N,N-亚甲基双丙烯酰胺为网络剂,溶于丙酮的偶氮二异丁腈为引发剂,制备了白光用YAG荧光粉.使用差热分析、XRD、SEM对YAG荧光粉进行了分析.相比于其他方法,用改进的Pechini法制备得到的YAG荧光粉结晶完整,物相较纯,形成温度较低(860℃),颗粒大小合适.将所制备的荧光粉涂覆在LED上进行了测试,结果表明其发光效率为目前商业荧光粉的90.1％.%An improved Pechini method was applied to synthesize YAG phosphor.Yttrium nitrate,cerium nitrate and aluminium nitrate were used as raw materials with ammonium citrate as complexing reagent and polyacrylamide as polymerizer.The YAG phosphor was analyzed by TG-DSC,XRD and SEM.The results showed that the phosphors synthesized by improved Pechini method had better crystallinity at lower calcining temperature compared with commercial advanced products.The illumination performance of pc-LEDs coated with the synthesized YAG phosphor were measured.The results show that the luminous efficiency of the synthesized YAG phosphor is 90.1％ of the commercial advanced phosphor.