Optimizing the Scintillation Kinetics of CsI Scintillator Single Crystals by Divalent Cation Doping: Insights from Electronic Structure Analysis and Luminescence Studies

Abstract

Investigating the effect of codopants on the afterglow and pulse shape discrimination of Tl-doped CsI is very crucial for its successful applications in the fields of particle identification and medical imaging. The present work primarily focuses on the details of the electronic structure and luminescence properties of single crystals doped with CsI and codoped with Tl + , Sr 2+ , and Eu 2+ . Our results reveal that there is a remarkable acceleration in the scintillation decay of the γ radiation of CsI:Tl codoped with Eu 2+ and Sr 2+ ions. Further, the deep energy level traps as evidenced by electronic structure calculations as well as thermoluminescence studies are found to be responsible for the observed changes in pulse shape discrimination and suppression of afterglow.

Crystal Growth and Spectroscopy of Yb2+-Doped CsI Single Crystal

“…This is due to its relatively low price, as well as low hygroscopicity [21]. Currently, research is being conducted to increase the light output of CsI-Tl crystals using digital signal processing methods [22], modifying growth techniques [23], using photonic crystals [24], as well as co-doping with various cations [25]. Pure CsI crystals cooled to a temperature of 77 K exhibit high light output [26,27].…”

CRYSTAL GROWTH AND SPECTROSCOPY OF Yb2+ DOPED CsI SINGLE CRYSTAL

“…This is due to its relatively low price, as well as low hygroscopicity [18]. Currently, research is being conducted to increase the light output of CsI-Tl crystals using digital signal processing methods [19], modifying growth techniques [20], using photonic crystals [21], as well as co-doping with various cations [22]. Pure CsI crystals cooled to a temperature of 77 K exhibit high light output [23,24].…”