Comparative analysis of scintillation characteristics derived from different emission mechanisms in BaCl2

Abstract

Crack-free La3+-substituted BaCl2 single crystals without and with Eu2+ as an activator were successfully grown using the micro-pulling-down method. Luminescence bands from BaCl2 without and with the Eu2+ activator were assigned as mainly intrinsic and extrinsic, respectively. Therefore, BaCl2 as a host material is suitable for investigating the effects of the emission mechanism on the non-proportionality curves and energy resolution plots. First, the scintillation characteristics of BaCl2:La3+(11 at. %) and BaCl2:La3+(7.7 at. %):Eu2+(0.5 at. %) single crystals were determined along with those of BaCl2 and BaCl2:Eu2+(0.5 at. %) crystals. Second, the non-proportionality curves from the different emission origins in BaCl2 were confirmed to be consistent with phenomenological models. Third, the non-proportionality curves and energy resolution plots originating from intrinsic (without Eu2+) and extrinsic (with Eu2+) luminescence were compared. The results experimentally demonstrated that the emission mechanism influenced scintillator non-proportionality curves.

Radioluminescence properties of Sm-doped fluorochlorozirconate glasses and glass-ceramics

“…12) Moreover, the broad emission observed around 350-450 nm is attributed to emissions by self-trapped excitons (STEs) from BaCl 2 crystallites since similar broad emissions are seen in the same spectral range from BaCl 2 bulk crystals, and these were reported elsewhere. 16,17,[29][30][31] Comparing PL and XL, the emissions of Sm 2+ by XL are weaker than that of Sm 3+ ; and the STE emission is slightly blue-shifted for PL compared to XL.…”

Growth of 6Li-enriched LiCl/BaCl2 eutectic as a novel neutron scintillator

“…In this study, Eu:BaCl 2 , which has low hygroscopicity and a high light yield of over 18 000 ph MeV −1 with a fast decay time of approximately 300-400 ns, 20,21) was selected as the luminescent phase. Meanwhile, The 95 wt% 6 Li enriched LiCl was selected as the neutron-capture phase.…”