Roles of Eu^2+, Dy^3+ Ions in Persistent Luminescence of Strontium Aluminates Phosphors |
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引用本文: | 吕兴栋.Roles of Eu^2+, Dy^3+ Ions in Persistent Luminescence of Strontium Aluminates Phosphors[J].武汉理工大学学报(材料科学英文版),2008,23(5):652-657. |
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作者姓名: | 吕兴栋 |
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作者单位: | Academy of Functional Materials, Jiangxi University of Finance and Economy, Nanchang 330013, China |
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基金项目: | Funded by Jiangxi University of Finance and Economy and Jlangxi Provincial Department of Education (No.[2007]260) |
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摘 要: | The polycrystalline Eu^2+ and Dy ^3+ co-doped strontium aluminates SrAl2O4: Eu^2+, Dy^3+ with different compositions were prepared by solid state reactions. The UV-excited photoluminescence, persistent luminescence and thermo-luminescence were studied and compared. Results show that the doped Eu^2+ ion in SrAl2O4: Eu^2+, Dy^3+ phosphors works as not only the UV-excited luminescent center but also the persistent luminescent center. The doped Dy^3+ ion can hardly yield any luminescence under UV-excitation, but effectively enhance the persistent luminescence and thermo-luminescence of SrAl2O4: Eu^2+. Dy^3+ co-doping can help form electron traps with appropriate depth due to its suitable electro-negativity, and increase the density and depth of electron traps. Based on above observations, a persistent luminescence mechanism, electron transfer model, is proposed and illustrated.
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关 键 词: | 铝酸锶 磷光体 持续发光 稀土金属 铕 镝 |
收稿时间: | 4 June 2006 |
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