Thermally activated processes in the relaxed excited states of aggregate color centers in KF : Na

Authors
Scacco, A Bottazzi, R Baldacchini, G Montereali, RM Cremona, M Grassano, UM
Citation
A. Scacco et al., Thermally activated processes in the relaxed excited states of aggregate color centers in KF : Na, RADIAT EFF, 146(1-4), 1998, pp. 323-329
Citations number
9
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
RADIATION EFFECTS AND DEFECTS IN SOLIDS
ISSN journal
10420150 → ACNP
Volume
146
Issue
1-4
Year of publication
1998
Pages
323 - 329
Database
ISI
SICI code
1042-0150(1998)146:1-4<323:TAPITR>2.0.ZU;2-A
Abstract
Optical absorption and photoluminescence spectra of KF crystals, doped with small concentrations of Na impurities and additively colored, are measured in order to determine thermally activated processes between different exci ted states of the F-A centers. The mechanism of transformation of F-A cente rs from type I (at low temperature) to type II (al higher temperatures) is fully confirmed by the anticorrelated temperature dependences of the intens ities of the two F-A(Na) luminescences peaking at 900 and 2150 nm.