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Title: Off-center Tl and Na dopant centers in CsI

We use density functional theory calculations to characterize the electronic and structural properties of the Tl and Na dopant centers in CsI. We nd that the Tl and Na centers can accept one or two electrons and couple to long-range relaxations in the surrounding crystal lattice to distort strongly off-center to multiple distinct minima, even without a triplet excitation. The long-range distortions are a mechanism to couple to phonon modes in the crystal, and are expected to play an important role in the phonon-assisted transport of polarons in activated CsI and subsequent light emission in this scintillator.
Authors:
;
Publication Date:
OSTI Identifier:
1130267
Report Number(s):
PNNL-SA-96152
NN2001000
DOE Contract Number:
AC05-76RL01830
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Physics. Condensed Matter, 25(49):Article No. 495504
Research Org:
Pacific Northwest National Laboratory (PNNL), Richland, WA (US)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English