摘要
利用高温固相反应法,制备了不同Sr/Ca比的(Ca1-xSrx)TiO3:0.002Pr3+(x=0-0.6)红色发光材料.荧光光谱与XRD测试结果表明:所有样品均发出源于Pr3+的1D2→3H4跃迁的612m红色光;发光强度与晶胞a轴均随固溶取代量x改变而连续变化,并在x=0.15的出现极值:发光强度提高约三倍,a轴则最小.研究揭示除不等价离子取代产生的电荷缺陷外,等价离子取代导致的固溶结构变化也是改变发光强度的有效途径.
Red phosphors （Ca1-xSrx）TiO3：0.002Pr^3＋ （x=0-0.6） were prepared by solid state reaction route and their properties were investigated by photoluminescence （PL） spectra and XRD, respectively. All samples have a red emission peak at 612nm due to the intra-4f transition of Pr^3＋ from ^1D2 to ^3H4 state. The results indicate that both emission intensity and a axis parameter show an extremum at x=0.15： the emission intensity is enhanced about 3 times, and the lattice parameter of a axis shows a minimum value. The results show that, besides the charge defects induced by unequilvalent ion substitution, the equilvalent Sr^2＋ substitution for Ca^2＋ can also influence the emission intensity through the crystal structure evolution.
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
2005年第5期1049-1053,共5页
Journal of Inorganic Materials
基金
浙江省教育厅项目(20030265)教育部留学回国人员科研启动基金(SRF for ROCS
SEM
2003-14)国家自然科学基金(50272059)
关键词
钙钛矿结构
CATIO3
固溶
发光
perovskite structure
calcium titanate
solid solution
luminescence
