| Sm3+掺杂(Y，Tb)AG∶Ce3+荧光粉的制备及光谱性能 | |
| Preparation and Photoluminescent Properties of Sm3+-doped (Y,Tb)AG∶Ce Phosphors | |
| 摘要: 采用柠檬酸溶胶凝胶燃烧合成法制备了一系列组成的(Y，Tb)3Al5O12∶Ce3+，Sm3+荧光粉。通过X射线衍射、荧光光谱研究了不同Sm3+离子共掺杂浓度下(Y,Tb)AG∶Ce3+荧光粉的晶体结构及光致发光性能。Rietveld全图拟合(Rietveld method of whole pattern fitting)结果表明：掺杂后样品仍为纯立方石榴石相，随着Sm3+离子共掺杂浓度的增加，样品的晶胞参数增大。在467 nm激发下，激发能由Ce3+离子向Sm3+离子单向传递，从而在617nm处出现红光发射。Tb3+离子取代不利于Ce3+离子与Sm3+离子的能量传递，同时Ce3+离子受更强的晶体场作用及与O2-离子间增强的共价性使发射主峰红移，Sm3+掺杂的TAG∶Ce体系中，激发能由敏化剂Ce3+离子向激活剂Sm3+离子的传递路径包括5d→4f2F5/2,7/2(Ce3+)和7F6→5D4(Tb3+)到4G5/2→6H7/2(Sm3+)两部分。 | |
| 关键词: YAG 溶胶凝胶燃烧合成法 光致发光 共掺杂 红移 | |
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| Abstract: A series of (Y,Tb)3Al5O12∶Ce3+, Sm3+ phosphors were prepared by a sol-gel combustion method. The crystal structure and photoluminescent property under different Sm3+ concentrations were investigated. The results by Rietveld method of whole pattern fitting indicate that the structure of all the samples is a cubic garnet. With increasing in Sm3+ concentration, the lattice constants increase monotonously. The red light emitting centered at 617 nm is the result of the one-way energy transition from Ce3+ ions to Sm3+ ions. Tb3+ ions substitution would go against the energy transition from Ce3+ to Sm3+. The yellow light emitting from Ce3+ ions shifts to a longer wavelength followed the complex effects of the stronger crystal field around Ce3+ ions and its stronger covalence of chemical bond with O2- ions. Within Sm3+ codoped TAG∶Ce system, the path for the activation energy transfer from the sensitizer Ce3+ ions to the activator Sm3+ ions involves transferring from the 5d→4f2F5/2,7/2(Ce3+) and 7F6→5D4(Tb3+) to 4G5/2→6H7/2(Sm3+). | |
| Keywords: YAG sol-gel combustion method photoluminescence codoping, red shift | |
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| 张 乐,王洪洲,许乃岑,王丽熙,张其土.Sm3+掺杂(Y，Tb)AG∶Ce3+荧光粉的制备及光谱性能[J].无机化学学报,2011,27(7):1249-1254. | |
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