| Y3Al5O12基质中Dy3+的浓度猝灭机制 |
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| 引用本文： | 杨浩,张乐,韩朋德,张其土.Y3Al5O12基质中Dy3+的浓度猝灭机制[J].南京工业大学学报(自然科学版),2012,34(2):16-20. |
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| 作者姓名： | 杨浩 张乐 韩朋德 张其土 |
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| 作者单位： | 1. 南京工业大学材料科学与工程学院,江苏南京,210009
2. 南京工业大学材料科学与工程学院,江苏南京210009;南京工业大学江苏省无机及其复合新材料重点实验室,江苏南京210009 |
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| 基金项目： | 江苏省自然科学基金资助项目(BK2007724);南京工业大学博士学位论文创新基金资助项目(BSCX200902);江苏高校优势学科建设工程资助项目 |
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| 摘 要： | 采用溶胶-凝胶/燃烧合成法制备不同掺杂浓度的Dy:Y3Al5O12(YAG)发光粉体。分析基质晶体结构、Dy3+掺量对Dy3+光致发光性能的影响,并探讨Dy3+在Y3Al5O12基质中的自身浓度猝灭机制。根据激发光谱,Dy:YAG的主激发峰位置在353 nm,对应Dy3+的6H15/2→6P7/2跃迁。在Dy:YAG晶体结构中,Dy3+取代Y3+的位置具有D2对称性,故Dy:YAG的蓝光发射强度要高于黄光发射强度,且Dy3+最佳摩尔分数为0.02;Dy3+的4F9/2→6H15/2、6H13/2跃迁发射的浓度猝灭机制均为相邻中心的电偶极-电偶极相互作用引起的交叉弛豫(4F9/2+6H15/2→6H9/2+6F3/2)所造成的。
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| 关 键 词： | 浓度猝灭 光致发光 溶胶-凝胶/燃烧合成法 钇铝石榴石 |
Mechanism of concentration self-quenching of Dy3+ ions in Y3Al5O12 |
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| YANG Hao
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ZHANG Le
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HAN Pengde
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ZHANG Qitu.Mechanism of concentration self-quenching of Dy3+ ions in Y3Al5O12[J].Journal of Nanjing University of Technology,2012,34(2):16-20. |
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| Authors: | YANG Hao ZHANG Le HAN Pengde ZHANG Qitu |
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| Institution: | 1,2(1.College of Materials Science and Engineering,Nanjing University of Technology,Nanjing 210009,China; 2.Jiangsu Provincial Key Laboratory of New Materials of Inorganic and its Composites,Nanjing University of Technology,Nanjing 210009,China) |
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| Abstract: | Dy:YAG phosphors with different doping concentrations were synthesized by the sol-gel combustion method.The dependence of the host crystal structure,and the Dy3+ concentration on the luminescent properties,and the mechanism of concentration self-quenching of Dy3+ were analyzed.Results indicated that the strongest excitation peak located at 353 nm corresponding to the 6H15/2→6P7/2 transition of Dy3+.In crystalline YAG,the Dy3+ ions occupied Y3+ sites whose point symmetry was D2 with an inversion center,so the maximum emission peak was 481 nm(blue luminescence).According to the dependence of the concentration of Dy3+ in Y3Al5O12 under the excitation of 353 nm,the optimum concentration for Dy3+ in Y3Al5O12 was x(Dy)=0.02.It was confirmed that the mechanism of concentration self-quenching of Dy3+ 4F9/2→6H15/2,6H13/2 transition was the cross relaxation(4F9/2+6H15/2→6H9/2+ 6F3/2) caused by the electric dipole-dipole interaction between Dy3+ ions. |
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| Keywords: | concentration quenching photoluminescence sol-gel combustion method yttrium aluminum garnet |
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