Synthesis and properties of nanocrystalline CsI

The structure and properties of fine CsI powders prepared by spray pyrolysis and synthetic opal (SiO 2 ) based composites containing CsI in their pores have been studied by electron microscopy, X-ray diffraction, and luminescence spectrometry. The powders consisted of nanocrystalline particles which...

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Bibliographic Details
Published in:Inorganic materials 2011-09, Vol.47 (9), p.1033-1038
Main Authors: Klimonsky, S. O., Sheberstov, K. F., Gol’dt, A. E., Sinitskii, A. S., Yakovlev, V. Yu, Trefilova, L. N.
Format: Article
Language:English
Subjects:
Chemistry
Chemistry and Materials Science
Crystallites
Decay
Emissions control
Industrial Chemistry/Chemical Engineering
Inorganic Chemistry
Luminescence
Materials Science
Nanocrystals
Networks
Silicon dioxide
Three dimensional
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Summary:The structure and properties of fine CsI powders prepared by spray pyrolysis and synthetic opal (SiO 2 ) based composites containing CsI in their pores have been studied by electron microscopy, X-ray diffraction, and luminescence spectrometry. The powders consisted of nanocrystalline particles which increased in size from 35 to 55 nm with increasing pyrolysis temperature. In the opal/CsI composites, the CsI nanocrystallites were about 45–50 nm in size and formed a single three-dimensional network between the SiO 2 spheres. In going from bulk crystals to their nanocrystalline analogs, the size effect on CsI luminescence leads to a reduction in luminescence yield, a redshift of the emission bands of the on-center and off-center self-trapped excitons (STEs), and an increase in the contribution of the off-center STEs to the net intrinsic emission yield. The emission decay kinetics of the off-center STEs is insensitive to the crystallite size.
ISSN:0020-1685
1608-3172
DOI:10.1134/S0020168511090111