Dy3+-doped Li2O-Gd2O3-ZrO2-P2O5 glass: Scintillation behaviors and synchrotron X-ray imaging application

초록

In this study, phosphate glass scintillators doped with varying concentrations of Dy2O3 were synthesized using the melt-quenching technique, aiming to develop high-performance scintillation materials for synchrotron X-ray imaging applications. The physical, structural, optical, luminescence and scintillation properties of the Dy: LiGdZrP glass samples were systematically investigated. This study found a gradual increase in the density, refractive index of glass samples with higher amounts of Dy2O3 doping. Distinct absorption peaks observed in the UV-Vis-NIR spectra confirm the incorporation of Dy3+ ions into the glass matrix. The photoluminescence (PL) spectra exhibited sharp emission peaks at 483 nm, 574 nm, 664 nm, and 753 nm, attributed to Dy3+ transitions. Among the samples, 1.00Dy:LiGdZrP showed the highest PL intensity, whereas the 0.50Dy:LiGdZrP glass demonstrated the strongest radioluminescence (RL) response. The Dy:LiGdZrP glasses exhibited millisecond-scale decay times, and the photoluminescence quantum yield (PLQY) of the 0.10Dy:LiGdZrP sample reached 34.01 %. Energy transfer studies confirmed efficient transfer from Gd3+ to Dy3+ ions. A reduction in the photoluminescence (PL) emission intensity of Gd3+ ions at 311 nm was observed alongside an increase in Dy3+ emission, indicating effective energy transfer from Gd3+ to Dy3+ ions. Additional evidence for this energy transfer mechanism was provided through decay time analysis (lambda Ex = 275 nm and lambda Em = 311 nm), which achieved the highest energy transfer efficiency of 79.77 % when the Dy2O3 concentration was 2.00 mol%. The integrated scintillation efficiency of the 0.50Dy:LiGdZrP sample reached approximately 11.21 % of that of a BGO crystal. Moreover, X-ray imaging assessments performed on the 0.50Dy:LiGdZrP sample yielded a spatial resolution of 10 lp/mm, emphasizing its viability as a promising material for high-resolution synchrotron-based X-ray imaging application.

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