Photoluminescence properties and energy transfer from Ce³⁺ to Tb³⁺ in Zn₂SiO₄ host

Abstract

Zn₂SiO₄: Tb³⁺, Zn₂SiO₄: Ce³⁺, Zn₂SiO₄: Tb³⁺, Ce³⁺ phosphors were prepared by solidstate reaction at 1 150 °C for 2 h under a weak reducing atmosphere. Moreover, the XRD patterns and photoluminescence spectra were recorded and the effects of Tb³⁺ and Ce³⁺ concentration on the luminescent properties of as-synthesized phosphors were investigated. The emission spectra under ultraviolet light (333 nm) radiation showed a dominant peak at 542 nm attributed to the ⁵D₄→⁷F₅ transition of Tb³⁺, which was enhanced significantly (about 45 times) by the co-doping of Ce³⁺, indicating that there occurred an efficient energy transfer from Ce³⁺ to Tb³⁺. According to the Dexter’s energy transfer formula of multipolar interaction, it was demonstrated that the energy transfer between Ce³⁺ and Tb³⁺ was due to the electric dipolar-dipolar interaction of the resonance transfer.

Keywords

phosphors / emission / Zn₂SiO₄:Tb³⁺, Ce³⁺ / transition / energy transfer

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