Optical properties of Dy2O3, Tb4O7 singly doped, Dy2O3/Tb4O7 codoped borogermanate-tellurite glasses for radiation application

In this paper, Dy 2 O 3 , Tb 4 O 7 singly doped and Dy 2 O 3 /Tb 4 O 7 -codoped borogermanate-tellurite glasses for radiation application were synthesized by a melt-quenching method. The density of developed glasses exceeds 5.0 g/cm 3 , which is the fundamental requirement of dense scintillators in the application fields of medical imaging and high-energy physics engineering. The optical properties of these glass scintillators were systematically studied by transmittance, photoluminescence (PL) and X-ray excited luminescence (XEL) spectra, together with the corresponding photoluminescence dynamic process. The transmittance results reveal that the transmittance rate of all glasses can reach at the vicinity of 80%. The optimal content of Dy 2 O 3 and Tb 4 O 7 for both PL and XEL intensity were determined under ultraviolet light and X-ray excitation, respectively. The energy transfer occurred from Dy 3+ to Tb 3+ ions were demonstrated, and the energy transfer efficiency from Dy 3+ to Tb 3+ ions is observed to increase with higherTb 4 O 7 content. The scintillation efficiency of Dy 3+ , Tb 3+ doped, and Dy 3+ /Tb 3+ co-doped borogermanate-tellurite scintillating glasses is about 10.45%, 41.38%, and 38.73% of the standard Bi 4 Ge 3 O 12 (BGO) crystal, respectively. • The efficient energy transfer from Dy 3+ to Tb 3+ ions in borogermanate-tellurite glasses were revealed. • The optimal concentration of Tb 3+ , Dy 3+ , and Dy 3+ /Tb 3+ were found to be 7 mol%, 1 mol%, and 1 mol%/4 mol%, respectively. • Dy 3+ , Tb 3+ singly doped, Dy 3+ /Tb 3+ codoped borogermanate-tellurite glasses with density of 5.0 g/cm 3 . • The XEL intensity of 4 mol% Tb 3+ green light is expectedly observed to decrease about 6.4% after the addition of 1 mol% Dy 3+ ion. • The scintillation efficiency of Dy 3+ , Tb 3+ doped, and Dy 3+ /Tb 3+ codoped glasses is about 10.45%, 41.38%, and 38.73% of the standard BGO crystal, respectively.