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Funct. Mater. 2018; 25 (4): 652-657.

doi:https://doi.org/10.15407/fm25.04.652

Scintillation properties of ACa1-yEuyX3 (A = K, Rb, Cs, X = Cl, Br) crystals

A.Yu.Grippa, N.V.Rebrova, T.E.Gorbacheva, V.L.Cherginets

Institute for Scintillation Materials, STC Institute for Single Crystals, National Academy of Sciences of Ukraine, 60 Nauky Ave., 61001 Kharkiv, Ukraine

Abstract: 

The presented paper describes a series of new Eu2+-activated scintillators of Ca1-yEuyX2, ACa1-yEuyX3, (A=K, Rb, Cs; X=Cl, Br, 0 ≤y≤0.08). All the single crystals were grown using the Bridgman-Stockbarger method and their operational characteristics were compared including affinity for atmospheric moisture and scintillation properties (light yield, energetic resolution and decay constant of scintillation light). The maximal values of light yield of ACa0.92Eu0.08X3 materials in the sequence A = K, Rb, Cs were observed for Rb-containing crystals: 38500 photons per MeV for RbCa0.92Eu0.08Cl3 and 54000 photons per MeV for RbCa0.92Eu0.08Br3. The distribution coefficients of Eu2+ in all the studied crystals are very close to unity that can be explained by perfect isomorphism of Eu2+ and Ca2+ cations.

Keywords: 
scintillation materials, Bridgman-Stockbarger method, calcium halides.
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