Investigation on luminescence behavior of Mg4Ta2O9 through experimental and first-principles calculation methods

Abstract

In this work, Mg4Ta2O9 single crystal was synthesized by optical floating zone method in N2 atmosphere. The luminescence behavior of Mg4Ta2O9 single crystal was investigated through experimental and first-principles calculation methods. Its photoluminescence, scintillation and thermal stimulated luminescence properties, including photoluminescence excitation, photoluminescence, photoluminescence decay, thermal stimulated luminescence and X-ray excited luminescence spectra, were measured. In addition, the temperature dependence of photoluminescence, photoluminescence decay and photoluminescence afterglow curves of Mg4Ta2O9 were measured and discussed. Combined with the experimental and density functional theory calculations result, the energy transfer schematic diagrams of the Mg4Ta2O9 were proposed to explain the photoluminescence, scintillation, and thermal stimulated luminescence behaviors.