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Proceedings Paper

Electronic excitations and defects in fluoroperovskite LiBaF3
Author(s): Maris Springis; Liga Brikmane; Ivar Tale; Peteris Kulis
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Paper Abstract

A survey of the present situation with respect to knowledge of lattice defects, electronic excitations, such as excitons and localized excitons, as well as energy storage and transfer phenomena in LiBaF3 crystals is given. Both phenomenological models and experimental interpretations of optical absorption bands, tentatively associated with F-type (electron) centers created by X-ray or electron irradiation, is reviewed. Interpretation of three radiative processes (super-fast core-valence transitions, slow trapped exciton luminescence and luminescence of structure defects) observed in undoped LiBaF3 crystals is analyzed with respect to practical application. Attention is paid to the behavior of ultraviolet emission so far ascribed to self-trapped exciton luminescence and also observed as a result of electron recombination with localized hole at various temperatures (even at room temperature), depending on crystal purity and growth conditions. Finally, some aspects of ionic processes in thermal relaxation of defects are pointed to.

Paper Details

Date Published: 8 August 2003
PDF: 7 pages
Proc. SPIE 5122, Advanced Organic and Inorganic Optical Materials, (8 August 2003); doi: 10.1117/12.515694
Show Author Affiliations
Maris Springis, Univ. of Latvia (Latvia)
Liga Brikmane, Univ. of Latvia (Latvia)
Ivar Tale, Univ. of Latvia (Latvia)
Peteris Kulis, Univ. of Latvia (Latvia)

Published in SPIE Proceedings Vol. 5122:
Advanced Organic and Inorganic Optical Materials
Andris Krumins; Donats Millers; Inta Muzikante; Andris Sternbergs; Vismants Zauls, Editor(s)

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