Hydrothermal Synthesis and Photoluminescent Properties of CaBPO5;RE(RE=Eu,Tb) Phosphors

Abstract

Abstract: CaBPO₅;RE(RE=Eu,Tb) phosphors were synthesized by hydrothermal method under a mild condition. The products were characterized by X-ray powder diffraction, scanning electron microscopy and luminescence spectrometer, etc.. Photoluminescence characteristics of the rare earth ions and sensitization of Ce³⁺ were investigated and compared with that of products prepared by solid state reaction at a high temperature. The results show that Eu³⁺, Tb³⁺ and Eu²⁺ co-exist in one matrix because there is an electron transfer process between Eu³⁺and Tb³⁺. It is interesting that the emission spectrum is peaked at 428 nm for Eu²⁺ in CaBPO₅;Eu,Tb prepared by hydrothermal method. Sensitization of Ce³⁺ improves the intensity of emission of Eu³⁺, Tb³⁺ and Eu²⁺. The reasons maybe are the competitions between the electron transfer among conjugate rare earth ions and the energy transfer between Ce³⁺ and Eu³⁺, Eu²⁺ and Tb³⁺.

Key words: Calcium borate-phosphate, Rare earth ion, Hydrothermal synthesis, Spectrum

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LIU Xiao-Tang, XIE De-Min, SHI Chun-Shan . Hydrothermal Synthesis and Photoluminescent Properties of CaBPO₅;RE(RE=Eu,Tb) Phosphors[J]. Chem. J. Chinese Universities, 2004, 25(2): 208.

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Hydrothermal Synthesis and Photoluminescent Properties of CaBPO₅;RE(RE=Eu,Tb) Phosphors

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