微波水热法制备铋铕共掺杂氧化钇磷光粉

用微波水热法制备化学计量比为(Y_0.94-x,Eu_0.06, Bi_x)₂O₃(x=0, 0.01~0.06 )的铋铕共掺杂氧化钇磷光粉。用XRD、SEM、EDS、荧光光谱及HRTEM等进行表征。结果表明:该系统由于铋的加入使(211)晶面的生长受到抑制;在激发波长346 nm时,由于铋的掺入使发光增强;随铋掺杂量的增加,其发光先增强后减弱,并在x=0.03时有最大值;因此该系统可作为320~375 nm的近紫外(如白光LED及高压汞灯)激发用磷光粉。该系统在激发波长为254 nm时,铋的加入使发光强度减弱;因此该系统不适合用于低压汞灯。

Bi and Eu-codoped Y₂O₃ Phosphor Prepared by Microwave Hydrothermal Processing and Its Luminescent Properties

(Y0.94-x,Eu0.06,Bix)2O3(x = 0,0.01~0.06) phosphor powders were prepared by microwave hydrothermal processing.The powders were characterized by XRD,SEM,EDS,photoluminescence and HRTEM.The growth of the crystal face(211) was restrained,resulting from Bi doping probably.The intensity of the emission spectra was generally enhanced when excited with 346 nm owing to Bi doping.It was raised first and then declined later on,and achieved a maximum when x=0.03,indicating that the phosphor powders can serve in near-UV...