Abstract
Single crystals of pure cesium iodide (CsI) have been grown from the melt using micro-pulling-down (μ-PD) method. Two kinds of crucible (graphite one and quartz one) were used for the growth and the grown crystals were investigated by X-ray diffraction (XRD) and X-ray rocking curve (XRC) analysis. The XRD analysis did not confirm any impurity phases and a sub-grain structure was observed for each sample in the rocking curve measurement. Under X-ray irradiation, strong STE emission peaks around 300nm were observed together with some luminescence related to unintentionally present impurities. The STE emission peaks are characterized by fast decay times of several ns and about 20ns which are interpreted as the on-center-type STE (VK+e) and off-center type STE (H+F) recombinations, respectively. The light yield of the STE-related emissions has been estimated to be 3000ph/MeV. Other emission peaks were observed at 410nm and 515nm. The former one can be related to Br-contamination and it is characterized by a relatively slow decay time of 6μs. Concerning the latter one at 515nm, similar luminescence was observed for the water-doped CsI grown by Bridgman method.
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