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无机材料学报

无机材料学报

• 研究论文 • 上一篇    下一篇

等价Ca、Sr离子固溶对CaTiO3:0.002Pr3+发光特性的影响

彭丽霞1; 洪樟连1,2; 周时风1; 王民权1,2   

  1. 1. 浙江大学材料科学与工程系; 2. 硅材料国家重点实验室, 杭州 310027
  • 收稿日期:2004-08-02 修回日期:2004-09-09 出版日期:2005-09-20 网络出版日期:2005-09-20

Effect of Sr2+ Substitution for Equivalent Ca2+ Ions on Luminescence Intensity of CaTiO3:0.002Pr3+

PENG Li-Xia1; HONG Zhang-Lian1,2; ZHOU Shi-Feng1; WANG Min-Quan1,2   

  1. 1. Department of materials Science & Engineering; Zhejiang Unviersity; Hangzhou 310027, China; 2. State Key Laboratory of Silicon Materials; Zhejiang University; Hangzhou 310027, China
  • Received:2004-08-02 Revised:2004-09-09 Published:2005-09-20 Online:2005-09-20

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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.

关键词: 钙钛矿结构, CaTiO3, 固溶, 发光

Abstract: Red phosphors (Ca1-xSrx)TiO3:0.002Pr3+ (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 Pr3+ 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
Sr2+ substitution for Ca2+ can also influence the emission intensity through the crystal structure evolution.

Key words: perovskite structure, calcium titanate, solid solution, luminescence

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