Up-conversion of Nd³⁺/Yb³⁺/Tm³⁺ tri-doped CaTeO₃ compound under excitation of 808 nm

Zhong-Qiang Ye，Si-Guo Xiao，Xiao-Liang Yang

School of Physics and Optoelectronics,Xiangtan University

摘 要：Nd³⁺/Yb³⁺/Tm³⁺ tri-doped CaTeO₃ compounds were prepared by a solid-state reaction method.Bright blue up-conversion（UC） luminescence at around 476 nm,which corresponds to the Tm³⁺:¹G₄→³H₆ transition,was observed under 808-nm excitation.The Nd³⁺→Yb³⁺→Tm³⁺ energy transfer process was responsible for the strong blue up-conversion emission in the tri-doped phosphor.The Tm³⁺ blue up-conversion emission intensity was strongly dependent on the concentrations of Yb³⁺ and Nd³⁺.The possible up-conversion mechanisms for the Nd³⁺/Yb³⁺/Tm³⁺ tri-doped CaTeO₃ phosphor are discussed,based on the Nd³⁺ and Yb³⁺ concentration-dependent UC spectra,near-infrared luminescence spectra and luminescence decay curves.

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