Effects of Na and K co-doping on growth and scintillation properties of Eu:SrI2 crystals

Abstract

We grew Na and K co-doped Eu:SrI 2 [Na,Eu:SrI 2 and K,Eu:SrI 2 ] crystals by a modified micro-pulling-down method to reveal the co-doping effects on the crystal growth and scintillation properties. The non-codoped, Na0.5%, Na1.0%, K0.5% and K1.0%,Eu:SrI 2 crystals indicated high transparency while the milky parts were generated in the Na5.0% and K5.0%,Eu:SrI 2 crystals. The light yields of Na,Eu:SrI 2 and K,Eu:SrI 2 crystals under -ray irradiation were decreased by the Na and K co-doping. On the other hand, there was a small change within 940~1020 ns in the decay times by the Na and K co-doping. In the light yield proportionality under -ray irradiation, the non-proportionality in the low energy region was improved by Na and K co-doping.

Stress‐Driven Phase Transitions of SrI2: A First‐Principles Investigation

“…[3] The difficulty of growing SrI 2 is mainly because of its distorted Pbca structure which hinders the crystallization. To further widen its applications, there have been growing efforts in improving its properties, e.g., with different doping and/or codoping, [6][7][8][9][10] as well as developing the techniques of crystal growth so as to reduce the production cost and make it economically available.…”

Development of the growth technique on cerium bromide single crystal by Halide‐micro‐pulling‐down method

“…We have developed a halide‐micro‐pulling‐down (H‐μ‐PD) method which can grow single crystal of the halide material with hygroscopicity at high growth rate . The growth techniques of the Ce:NaCl, Pr:NaCl, PbCl 3 , Eu:SrI 2 and other halide scintillator single crystals were developed by the modified H‐μ‐PD method . In the modified H‐μ‐PD method, the wetting angle between the melt of halide material and the crucible is important to achieve the stable growth of the single crystal.…”

“…In the modified H‐μ‐PD method, the wetting angle between the melt of halide material and the crucible is important to achieve the stable growth of the single crystal. The melts of the chloride and iodide materials generally shows bad wetting to the carbon and their single crystals can be grown stably by the carbon crucible with a ϕ1∼2 mm hole at the bottom . However, the melt of the bromide materials generally has good wetting angle to the carbon and it is difficult to grow the single crystal of the bromide materials using the carbon crucible with a ϕ1∼2 mm.…”