期刊
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
卷 252, 期 4, 页码 804-810出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/pssb.201451464
关键词
cryogenic scintillator; CsI; low temperature; scintillation decay time; X-ray luminescence
资金
- Royal Society (London)
- Science & Technology Facilities Council (STFC)
- Science and Technology Facilities Council [ST/K002929/1, ST/K003046/1, ST/K006517/1] Funding Source: researchfish
- STFC [ST/K003046/1, ST/K006517/1, ST/K002929/1] Funding Source: UKRI
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. (C) 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
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