以丙二酸为络合剂,通过溶胶-凝胶法合成了亚微米级YAG:Ce,Gd黄色荧光粉.采用TG/DSC、XRD研究干凝胶热分解和YAG晶相形成的过程;通过荧光光谱分析了Gd~(3+)的掺杂对荧光粉的发光强度的影响规律;通过SEM观察粉体的微观形貌.结果表明:经1200 ℃煅烧3 h得到的荧光粉,粉体粒径为0.3～1 μm,颗粒规则接近球形;随着Gd~(3+)掺杂量的增加,荧光粉的发射光谱由525 nm红移到550 nm.
YAG:Ce,Gd yellow phosphors were synthesized by malonic acid Sol-gel method. The decomposition process of the dry gel and the formation process of crystalline YAG were characterized by TG/DSC and XRD techniques. The influence of Gd~(3+) doping on the luminescent intensity of the phosphor and the microstructure of powders were studied by fluorescence spectrum and SEM. The results indicate that powders calcined at 1200 ℃ for 3 h are about 0.3-1 μm in size with ball morphology. The emission spectrum of phosphor showes gradually red-shift from 525 nm to 550 nm with the increase of doping concentration of Gd~(3+) ion.
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