摘要
该文介绍以Eu^(3+)和Bi^(3+)离子为掺杂剂,以Li_(0.3)Me_(0.4)Al_(0.3)SiO_3为基质(Me=Mg,Ca,Sr,Ba),用高温固相反应合成了含不同碱土金属,不同掺杂种类的硅铝酸盐系列发光体.激发光谱和发射光谱研究结果表明,在该体系中Bi^(3+)对Eu^(3+)具有较好的敏化作用,促进了Eu^(3+)的特征发光.基质中不同的碱土金属离子对Bi^(3+)和Eu^(3+)的发光特性和Bi^(3+)对Eu^(3+)的敏化作用具有明显的影响。当Me=Sr时,激发Bi^(3+)所得到的Eu^(3+)发光以612nm红光为主,并且相对强度较高.在相同激发条件下(395nm),Li_(0.3)BaAl_(0.3)SiO_3:Eu的发射强度是Y(V,P)O_4:Eu^(3+)的2倍.这表明Li_(0.3)BaAl_(0.3)SiO_3是很适合于Eu^(3+)激活的基质材料.
The luminophors of silicates Li0.3Me Al0.3SiO3:Eu, Bi (Me=Mg, Ca, Sr, Ba) were synthesized and luminescence properties of Bi3+ and Eu3+ ions were studied. The effects and regularities of Me (Ⅱ) ions on the luminescence of Eu3+ and Bi3+ ions were also investigated. The study on the luminescence of silicates Li0.3 Me Al0.3SiO3:Eu, Bi indicated that there were energy transitions from the Bi3+ ion to Eu3+ ion and that Bi3+ions acted as toth sensitizer and co-activator. The best promoting result of Bi3+ to Eu3+ was obtained when Me was Sr, i. e. the relative intensity was the highest by exciting the Bi3+ ion. The main emission of the Eu3+ion was from5D0-7F1 transition for Me=Mg, Oa, Sr, and from 5D0-7F2 for Ba.Under UV excitation of 395nm, the luminescence intensity of Eu3+ in Li0.3BaAl0.3SiO3: Eu was 2 times that of Y(V, P)O4: Eu, for both, of 5D0-7F1 and of 5D0-7F2 transition emissions. The experiment results demonstrated that the optimum synthesis condition was 950°C and 4 hours sintered in twice and silicate Li0.3 BaAl0.3SiO3 was an excellent host lattice to obtain efficient photoluminescence materials.
出处
《应用科学学报》
CAS
CSCD
1991年第4期329-334,共6页
Journal of Applied Sciences
关键词
发光材料
碱土金属
硅铝酸盐
稀土
Inorganio materials, photoluminescence, silicate.
