Radio and thermoluminescence performances of Dy3+-doped phospho-tellurite glass for scintillation and dosimetry materials applications

초록

This study reports the development and comprehensive luminescence characterization of Dy3+-doped phosphotellurite glasses with the composition(40-x)TeO2-30P(2)O(5)-20ZnO-5Sb(2)O(3)-5Li(2)O-xDy(2)O(3) (x = 0.0-1.5 mol%). The glasses were synthesized using the conventional melt-quenching technique and investigated for their potential in scintillation and dosimetry applications. Photoluminescence spectra under 350 nm excitation exhibited intense visible emissions dominated by the F-4(9/2) -> H-6(13/2) electric dipole transition, with maximum intensity at 1.0 mol% Dy2O3. Radioluminescence measurements performed under Cu-anode X-ray excitation (50 kV, 30 mA) revealed emission centered at 574 nm, with a relative intensity of approximately 2.26 % compared to BGO scintillators. Despite this lower yield, the material provided sufficient spatial resolution for X-ray imaging, achieving a modulation transfer function (MTF) of 11.2 LP/mm and resolving multilayered structures under varying tube currents. Additionally, thermoluminescence glow curves displayed a well-defined peak at 248 degrees C, with an activation energy of 0.54 eV and a frequency factor of 1.30 x 10(4) s(-1), confirming the presence of stable trap centers suitable for radiation dosimetry. These results highlight the multifunctional nature of Dy3+-doped phospho-tellurite glasses as cost-effective, transparent, and versatile materials for combined scintillation imaging and TL-based dosimetry systems.

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