【摘要】 通过溶胶-凝胶法制备出不同Tb3+掺杂浓度和不同二次煅烧温度下的ZnAl2O4∶Tb3+荧光粉,并利用X射线衍射(XRD)和荧光光谱等对样品进行了表征。由XRD结果可知,当Tb3+掺杂的摩尔分数不大于9%,二次煅烧温度在600℃以上时,所得粉体为结晶性良好的尖晶石相。在紫外光激发下,ZnAl2O4∶Tb3+荧光粉的发射光谱由位于488 nm(5D4→7F6)、542 nm(5D4→7F5)、587 nm(5D4→7F4)和621.5 nm(5D4→7F3)的4个发射峰组成。研究发现,Tb3+的掺杂浓度和二次煅烧温度对样品发光强度有着重要影响,当Tb3+的摩尔分数为5%,二次煅烧温度为900℃时,ZnAl2O4∶Tb3+荧光粉的发光最强,继续增加Tb3+掺杂浓度或提高煅烧温度,分别会出现浓度猝灭和温度猝灭现象。更多还原

【Abstract】 The ZnAl2O4∶ Tb3 +phosphor powders were synthesized by sol-gel method with different doping concentrations of Tb3 +and secondary calcination temperatures. Then they were characterized by X-ray diffraction( XRD) and photoluminescence( PL). The XRD patterns show that the pure spinel phase of high crystallinity can be obtained when the mole fraction of Tb3 +is less than 9% and the secondary calcination temperature exceeds 600 ℃. Under the excitation of ultraviolet light,the emission spectra of ZnAl2O4∶ Tb3 +phosphor consists of four peaks locating at 488 nm(5D4→7F6),542 nm(5D4→7F5),587 nm(5D4→7F4),and 621. 5 nm(5D4→7F3). The influence of Tb3 +concentration and secondary calcination temperature on the luminescence intensity was significant.The photoluminescence spectra intensity of ZnAl2O4∶ Tb3 +is the strongest when the mole fraction of Tb3 +is 5% and the secondary calcination temperature is 900 ℃. When the mole fraction of Tb3 +and the secondary calcination temperature increase excessively,concentration quenching and temperature quenching appear,respectively.更多还原