Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5399247 | Journal of Luminescence | 2016 | 11 Pages |
Abstract
We report two new ternary metal halide scintillators, KBa2I5 and K2BaI4, activated with divalent europium. Single crystal X-ray diffraction measurements confirmed that KBa2I5 has a monoclinic structure (P21/c) and that K2BaI4 has a rhombohedral structure (R3c). Differential scanning calorimetry showed singular melting and crystallization points, making these compounds viable candidates for melt growth. We grew 13Â mm diameter single crystals of KBa2I5:Eu2+ and K2BaI4:Eu2+ in evacuated quartz ampoules via the vertical Bridgman technique. The optimal Eu2+ concentration was 4% for KBa2I5 and 7% for K2BaI4. The X-ray excited emissions at 444Â nm for KBa2I5:Eu 4% and 448Â nm for K2BaI4:Eu 7% arise from the 5d-4f radiative transition in Eu2+. KBa2I5:Eu 4% has a light yield of 90,000Â photons/MeV, with an energy resolution of 2.4% and K2BaI4:Eu 7% has a light yield of 63,000Â ph/MeV, with an energy resolution of 2.9% at 662Â keV. Both crystals have an excellent proportional response to a wide range of gamma-ray energies.
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Authors
L. Stand, M. Zhuravleva, B. Chakoumakos, J. Johnson, A. Lindsey, CL. Melcher,