易分散球形YAG:Ce^(3+)荧光粉的制备和性能

Synthesis and Properties of Well-dispersive and Spherical YAG:Ce^(3+) Phosphors

将微波均相沉淀与喷雾干燥相结合,并添加助熔剂辅助煅烧制备出单相YAG:Ce^(3+)荧光粉体,研究了微波均相沉淀与喷雾干燥的共同作用对煅烧条件和YAG:Ce^(3+)荧光粉颗粒形貌、分散性和荧光性能的影响。结果表明,这种单相YAG:Ce^(3+)荧光粉体具有良好分散性,平均粒径为2μm;将微波均相沉淀与喷雾干燥相结合能制备出分散性好的球形YAG前驱体颗粒;添加NaF助熔剂使煅烧温度降低至1150℃,并得到纯YAG晶相;随着NaF添加量的增加荧光粉结晶度提高、发光强度增强、发射光谱蓝移;NaF添加量(质量分数)为6%时荧光粉的荧光强度最高,且与单一助熔剂比较,H_3BO_3 NaF混合助熔剂能更好的改善YAC:Ce^(3+)的荧光性能。

The well-dispersive single--phase YAG：Ce3＋ phosphors with average particle size of 2μm were synthesized by microwave homogeneous precipitation and spray-drying method, combining with flux- assisted calcination. The effect of combined actions on calcination conditions and morphology, dispersity and luminescence performance of YAG：Ce3＋ particles was investigated. The results show that spherical-like YAG precursor can be obtained by a combination of microwave homogeneous precipitation and spray-drying methods, and the formation temperature of pure phase of YAG lowered to 1150℃ with NaF as a flux. The crystallization and emission intensity are obviously improved with increasing contents of NaF flux, and blue-shift in the PL spectrum was found. The maximum emission intensity was obtained after 6wt% NaF was added, and HaBO3-NaF flux can lead to a better luminescence property of YAG：Ce3＋ compared to that by NaF flux.