Energy Transfer Study on Dense Eu ³⁺ /Tb ³⁺ ‐Coactivated Oxyfluoride Borogermanate Scintillating Glasses

Abstract

Tb 3+ ‐, Eu 3+ ‐activated, and Eu 3+ /Tb 3+ ‐coactivated oxyfluoride borogermanate scintillating glasses with the density of about 6.50 g/cm 3 were successfully synthesized by a melt‐quenching method. The structure and optical properties including transmittance, photoluminescence (excitation and emission spectra), photoluminescence decay, and X‐ray excited luminescence behaviors were studied in detail. Our results reveal that the energy‐transfer efficiency from Tb 3+ to Eu 3+ ions increases with an increase in Eu 3+ concentration. The energy‐transfer mechanism is also discussed by Dexter's and Reisfeld's semiexperimental methods.