摘要
采用溶胶-凝胶法制备了Ba_2YAlO_5:Eu^(3+)红色荧光粉,通过XRD,SEM,荧光光谱分别对样品的结构、形貌以及发光性能进行了表征,讨论了Eu^(3+)掺杂浓度、煅烧温度、Bi^(3+)掺杂对样品发光性能的影响。结果表明:实验所得样品主晶相为Ba_2YAlO_5。颗粒形貌不规则,粒径大小为2~10μm。合成的荧光粉在260 nm紫外光激发下发出明亮的红光,最佳Eu^(3+)掺杂量为8%(摩尔分数),最佳煅烧温度为1250℃。掺杂Bi^(3+)后,样品的结构没有改变,但激发光谱发生了变化,在300~375 nm处出现激发峰,对应于Bi^(3+)的1S0→3P1跃迁。随着Bi^(3+)掺杂浓度的增加,在333 nm激发下,发光强度先增加后减弱,存在Bi^(3+)→Eu^(3+)的能量传递过程。
The Ba2YAlO5： Eu^3＋ red phosphor was synthesized by sol-gel method. The XRD,SEM,and fluorescence spectrum characterized the structure,shape and luminous property of the sample. And the effects of Eu^3＋ doping concentration,sintering temperature,and Bi^3＋ doping on the sample were discussed in the paper. The results showed that the sample＇s main crystal phase was Ba2YAlO5. The shape of the granule was irregular,with an average diameter of 2 ～ 10 μm. The synthesized phosphor,excited by 260 nm UV-light,emitted bright red light and the optimal doping concentration of Eu^3＋ was 8% and the sintering temperature was 1250 ℃. Doped by Bi^3＋ ,the structure of the sample did not change,but the excitation spectrum of the sample changed,an excitation peak appears within 300 ～ 375 nm,which belongs to the Bi^3＋ 1S0→3P1transition. With the increase of the Bi^3＋ doping concentration,the luminous intensity of the red phosphor first enhanced and then decreased under the 333 nm excitation wavelength,indicating the energy transfer from Bi^3＋ to Eu^3＋ .
出处
《中国稀土学报》
CAS
CSCD
北大核心
2016年第2期139-145,共7页
Journal of the Chinese Society of Rare Earths
基金
国家自然科学基金项目(51304086)资助
