Abstract
Radio-photoluminescence (RPL), which is an infrequent phenomenon observed in phosphor materials where new luminescent centre is generated by interacting with ionizing radiation, was observed in Eu-doped BaAlBO3F2 (BABF) glass-ceramics. The as-prepared material shows photoluminescence (PL) only due to the 4f‐4f transitions of Eu3+ whereas an additional broad emission band appears around 510 nm, which is due to the 5d‐4f transitions of Eu2+. The appearance of the Eu2+ as a new emission centre is an evidence of RPL. The RPL in this system is based on intra-valence reduction of Eu ion (Eu3+→Eu2+), which was confirmed as a decrease of PL intensity by Eu3+ and increase of PL intensity by Eu2+ as a function of irradiation dose. Moreover, additional RPL centre is observed after heat-treatment of irradiated material, which is seen as a broad PL peak centering around 480 nm. Based on the luminescence features, the latter RPL is characterized to defect-related luminescence.
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