Investigation of the competition between Tl+ and Ce3+ scintillation in Tl2LiYCl6:Ce, an elpasolite scintillator

Moretti, Federico; Onken, Drew; Perrodin, Didier; Bourret, Edith

doi:10.1016/j.jlumin.2021.118549

Title: Investigation of the competition between Tl⁺ and Ce³⁺ scintillation in Tl2LiYCl6:Ce, an elpasolite scintillator

Journal Article · Fri Oct 22 00:00:00 EDT 2021 · Journal of Luminescence

DOI:https://doi.org/10.1016/j.jlumin.2021.118549· OSTI ID:1859715

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Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

Li-containing elpasolite scintillators are currently investigated for their ability to detect both thermal neutrons and gamma photons with a single inorganic crystal. The scintillation is typically triggered by using an activator such as Ce. However, when Tl, also a luminescent ion, is present in the matrix, competition between the two centers Tl and Ce can occur. In this study, we are using Ce doped Tl₂LiYCl₆ to investigate this competition. To this end, the Ce (which substitutes Y) concentration is varied from 0 to 1 in the Tl₂LiY_1-xCexCl₆ composition. In the low concentration range in which Ce remains a dopant, the photo- and radioluminescence spectra show that the scintillation of Tl₂LiYCl₆:Ce is mostly dominated by recombination on intrinsic luminescent centers. For cerium concentrations higher than x = 0.02, very different emissions can be easily distinguished from the photo- and radioluminescence of undoped and low Ce doped Tl₂LiYCl₆ crystals. These emissions are attributed to the formation of a second phase Tl₂CeCl₅, identified by X-ray diffraction. We conclude that the intrinsic luminescence related to Tl dominates the scintillation in the range of concentration for which Ce does substitute on the Y-site.

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Research Organization:: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-05CH11231; SC0015793

OSTI ID:: 1859715

Journal Information:: Journal of Luminescence, Vol. 241; ISSN 0022-2313

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Investigation of the competition between Tl⁺ and Ce³⁺ scintillation in Tl2LiYCl6:Ce, an elpasolite scintillator