Analysis of influencing factors and changing laws on fluorescence lifetime of Er3+, Yb3+ Co-doped Gd2O2S phosphor

Abstract

Although rare earth up-conversion luminescent materials have become a research topic for many researchers because of its excellent luminescent properties, the variation of its fluorescence lifetime is still a problem worth discussing. The Er3+, Yb3+ co-doped Gd2O2S phosphor prepared by the high temperature solid state method was used to study the change law of fluorescence lifetime. The effects of different calcining temperature (1000 °C–1175 °C), calcining time (3.0 h–5.5 h), concentration of Er3+ (0.1 mol% – 30 mol%) and the doping ratio of Er3+:Yb3+ (1:1–1:7) on the properties and fluorescence lifetime of the synthesized Er3+, Yb3+ co-doped Gd2O2S phosphor were investigated, and the orthogonal experiments were used to optimize the factors. The structure and morphology evolution of the Gd2O2S: Er3+, Yb3+ phosphor was systematically studied by X-ray powder diffraction (XRD). The fluorescence properties of Gd2O2S: Er3+, Yb3+ phosphor were studied from the aspects of emission spectrum and fluorescence lifetime. This work would provide a new perspective for applying fluorescence lifetime analysis of energy transfer in up-conversion luminescence materials.