We find that the high-Z crystal Barium Iodide is readily growable by the Bridgman growth technique and is less
prone to crack compared to Lanthanum Halides. We have grown Barium Iodide crystals: undoped, doped with
Ce3+, and doped with Eu2+. Radioluminescence spectra and time-resolved decay were measured. BaI2(Eu)
exhibits luminescence from both Eu2+ at 420 nm (~450 ns decay), and a broad band at 550 nm (~3 μs decay)
that we assign to a trapped exciton. The 550 nm luminescence decreases relative to the Eu2+ luminescence
when the Barium Iodide is zone refined prior to crystal growth. We also describe the performance of BaI2(Eu)
crystals in experimental scintillator detectors.
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