Relationship Between Luminescent Properties and Structures of Li2O-CaO-Gd2O3-SiO2 :Eu,Bi System

Abstract

Abstract: The variations of phase components depending on the concentrations of Gd₂O₃ in the system of Li₂O-CaO-Gd₂O₃-SiO₂:Eu,Bi were studied by powder X-ray diffraction.It was investigated that the structures and species of silicates affect the luminescent properties of Eu(Ⅱ) ion and Bi(Ⅲ) ion.If Gd concentration is small, the product is β-Ca₂SiO₄.The phases Ca₂Cd₈(SiO₄)₆O₂ and LiCd₉(SiO₄)₆O₂ appear and their contents increase with Gd₂/O₃ being 0.25 when the ratio Gd₂O₃/SiO₂ is more than 2.5 wt% .The luminescence intensity of Eu³⁺ ion in the sample is five times that of Eu³⁺ ion in the sample with Gd₂O₃/SiO₂ being 0.2.The structures of the two phases containing Gd favor both red emission of Eu³⁺ ion and energy transfer from sensitizer to activator.The solid solution formed by the two compounds is a better host material than single LiCd₉(SiO₄)₆O₂ phase.

Key words: Luminescent materials, Rare earth silicate, Crystal structure

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TIAN Yi-guang, WANG Chuan-sheng, LI Bin . Relationship Between Luminescent Properties and Structures of Li₂O-CaO-Gd₂O₃-SiO₂ :Eu,Bi System[J]. Chem. J. Chinese Universities, 1992, 13(5): 567.

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Relationship Between Luminescent Properties and Structures of Li₂O-CaO-Gd₂O₃-SiO₂ :Eu,Bi System

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