Scintillation properties of GAGG:Ce ceramic and single crystal.

Recently developed ceramic and single crystal Cerium-doped gadolinium aluminum gallium garnet (GAGG:Ce) scintillators were studied. We compared their scintillation properties with samples of the same 5 × 5 × 5 mm 3 size. In photoluminescence emission spectra, ceramic and single crystal GAGG:Ce showed intense emission peak at 555 nm and 515 nm, respectively, ascribed to 5d–4f transitions of Ce 3 +. And the single crystal GAGG:Ce had a weak emission peak appearing at 380 nm. The light yield induced by 137 Cs γ -ray of ceramic was higher than that of single crystal. The afterglow of ceramic GAGG:Ce was shorter than that of single crystal after illumination. At room temperature, single crystal GAGG:Ce was more severely affected by thermoluminescence than ceramic GAGG:Ce. The primary decay time of ceramic and single crystal under γ -ray was 182.9 ns and 50.1 ns, respectively. Furthermore, the fast component of decay time was found in single crystal. This research can lay the foundation for the preparation of better GAGG:Ce scintillators in the future. • The scintillation properties of ceramic and single crystal GAGG:Ce were compared. • At room temperature, the afterglow of ceramic GAGG:Ce decreased faster. • Ceramic GAGG:Ce exhibited higher light yield and better energy resolution. • A fast decay time component was found in the single crystal GAGG:Ce. [ABSTRACT FROM AUTHOR]