Radiophotoluminescence Properties of Bi-doped CaBPO5

Bi-doped CaBPO 5 was synthesized by the solid-state reaction method, and its radiophotoluminescence (RPL) properties were subsequently examined.Steady-state photoluminescence (PL) studies suggest that Bi 2+ ions are generated upon X-ray irradiation, resulting in a PL emission band with a peak at 630 nm.The RPL-related PL signal is unstable at room temperature, decreasing to approximately 50% of its initial intensity within 20 min.Heat treatment accelerates the signal decay, with the signal minimized after heating to 500 .Following signal erasure via heat treatment at 500 , the material sensitivity to X-ray irradiation shows a slight increase with repeated cycles, rising by approximately 40% of the original sensitivity after 10 cycles.