Optimization of Eu_0.6Gd_(0.4-x)Tb_xBO₃ phosphor with Tb³⁺ concentration for X-ray screen material application

In this study, Eu_0.6Gd_(0.4-x)Tb_xBO₃ (0.000 ≤ x ≤ 0.015) phosphors doped with varying concentrations of Tb³⁺ were synthesized using the solid-state reaction technique at a temperature of 900 °C for 18 h. X-ray diffraction (XRD) was employed to analyze the crystal structures of the Triclinic and Hexagonal phases corresponding to EuBO₃ (ICSD No 01-089-7888) and EuBO₃ (ICDD No 00-013-0485), respectively. The optical properties were analyzed through absorption excitation and emission spectra obtained via photoluminescence (PL) and radioluminescence (RL) techniques. The CIE chromaticity coordinates indicate a reddish-orange. The sample with x = 0.010 exhibited good optical efficiency under both PL (λ_ex = 394) and RL. Furthermore, the radioluminescence performance of the x = 0.010 phosphor was 9.4% higher than that of the undoped phosphor. Samples responding to X-rays can be presented radiography, appearing brighter and clearer. This indicates that the samples exhibit favorable characteristics for application as an X-ray screen.