Abstract
High optical quality undoped strontium iodide crystal grown by using the Bridgman method was characterized. Crystal growth process was described and growth technical parameters were discussed. Impurity analysis of raw materials and as-grown crystal boule indicates that it is feasible to pre-purify the raw material by zone refining or recrystallization. Luminescence properties were studied by photoluminescence, radioluminescence, fluorescence decay time, and scintillation time response. As-grown crystal shows good optical transmittance with wavelength concerned and is transparent for its large Stoke shift, 540nm peaked broad emission, which has a fluorescence decay time 494ns at 300K. The broad emission range from 350nm to 800nm was tentatively speculated to be intrinsic and have an origin of self-trapped exciton.
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