2014/11/23 by V. B. Mikhailik, V. Kapustyanyk, V. Tsybulskyi +2 · 1 citation
Engineering · Physics and Astronomy · #Adiabatic process #Advanced Semiconductor Detectors and Materials #Afterglow #Atomic and Subatomic Physics Research #Exciton #Luminescence #Population #Radiation Detection and Scintillator Technologies #Scintillation #Scintillator #cond-mat.mtrl-sci #nucl-ex #physics.ins-det
paper · pdf · doi:10.1002/pssb.201451464
arxiv created 2014/11/23 · openalex publication_date 2015/01/14 · arxiv updated 2015/08/12 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Caesium iodide is one of the most extensively studied scintillators. Here, we present X‐ray luminescence spectra, scintillation light output and decay curves as a function of temperature, from room temperature down to below 10 K. Features of the observed intrinsic luminescence are explained in terms of radiative recombination of on‐ and off‐center STE. A model permitting interpretation of the dynamics of luminescence changes in CsI with temperature is suggested. This model includes adiabatic potential energy surfaces (APES) associated with singlet and triplet states of self‐trapped excitons (STE) and explains the variation of the luminescence spectra with temperature as a result of re‐distribution in the population between on‐ and off‐center STE. The temperature dependence of the scintillation light yield is discussed in the framework of the Onsager mechanism.