Comparative studies on scintillation properties of Eu-doped CaAl₂O₄, SrAl₂O₄, and BaAl₂O₄ crystals

Abstract

Abstract Eu:CaAl 2 O 4 , Eu:SrAl 2 O 4 , and Eu:BaAl 2 O 4 crystals with various dopant concentration were synthesized by the optical floating zone method, and the photoluminescence, scintillation, and afterglow properties were investigated. Under X-ray irradiation, Eu:CaAl 2 O 4 Eu:SrAl 2 O 4 , and Eu:BaAl 2 O 4 exhibit a broad emission band at 440, 520, and 500 nm due to 5d-4f transitions of Eu 2+ , respectively. The decay time constants are consistent with the typical values of 5d-4f transitions of Eu 2+ . Photoluminescence quantum yield and scintillation light yield were evaluated, and each property was compared to comprehensively understand the characteristics.