Luminescence and Preparation of LED Phosphor Ca8Mg(SiO4)4Cl2:Eu2+
来源期刊：JOURNAL OF RARE EARTHS2005年第5期
论文作者：Lin Jianhua Yao Guangqing Yang Ping
Key words：europium doped calcium magnesium chlorosilicate; LED green phosphors; wide excitation band; tricolor phosphor; rare earths;
Abstract: Calcium magnesium chlorosilicate doped by europium, Ca8Mg(SiO4)4Cl2:Eu2+, 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:Eu2+ 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 Eu2+ is 2%. The wavelength of emission and excitation of the phosphor with various Eu2+ 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.
Lin Jianhua1，Yao Guangqing1，Yang Ping1
(1.College of Chemistry and Molecular Engineering, State Key Laboratory of Rare Earth Materials Chemistry and Applications, Peking University, Beijing 100871, China)
Abstract:Calcium magnesium chlorosilicate doped by europium, Ca8Mg(SiO4)4Cl2:Eu2+, 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:Eu2+ 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 Eu2+ is 2%. The wavelength of emission and excitation of the phosphor with various Eu2+ 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.
Key words:europium doped calcium magnesium chlorosilicate; LED green phosphors; wide excitation band; tricolor phosphor; rare earths;
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