Luminescence and Preparation of LED Phosphor Ca8Mg ( SiO4)4Cl2 : Eu^2+ |
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作者姓名: | 杨萍 林建华 姚光庆 |
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作者单位: | College of Chemistry and Molecular Engineering, State Key Laboratory of Rare Earth Materials Chemistry andApplications, Peking University, Beijing 100871, China |
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基金项目: | Project supported by the National High-Tech Research Program of China (2001AA-ZB3103 ) |
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摘 要: | Calcium magnesium chlorosilicate doped by europium, Ca8Mg(SiO4)4Cl2: Eu^2+, was prepared by the solid state reaction at high temperature. The compound obtained is pure Ca8Mg(SiO4)4Cl2 phase with cubic structure. Its average particle size is 5 μm, and it has good dispersity and morphological form. The excitation spectrum of Ca8Mg(SiO4)4Cl2: Eu^2+ is a wide band, which covers from 270 to 480 nm. The emission spectrum is also a wide band peaked at 510 nm. The luminescent intensity reaches to the maximum when the concentration of Eu^2 + is 2%. The wavelength of emission and excitation of the phosphor with various Eu^2 + contents keeps constant. This spectrum range matches violet and blue LED chips very well, and its strong luminescence intensity is suitable for a green phosphor of tricolor phosphor of white light LED.
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关 键 词: | 发光二极管 发光性能 稀土 铕 三基色 |
文章编号: | 1002-0721(2005)05-0633-03 |
收稿时间: | 2005-04-10 |
修稿时间: | 2005-06-30 |
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