New spectroscopic investigation of Cr3+ centres in LiNbO3 crystals

Citation
F. Lhomme et al., New spectroscopic investigation of Cr3+ centres in LiNbO3 crystals, J LUMINESC, 83-4, 1999, pp. 441-445
Citations number
12
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
JOURNAL OF LUMINESCENCE
ISSN journal
00222313 → ACNP
Volume
83-4
Year of publication
1999
Pages
441 - 445
Database
ISI
SICI code
0022-2313(199911)83-4:<441:NSIOCC>2.0.ZU;2-R
Abstract
We have studied Cr3+ emission in LiNbO3 crystals with compositions close to stoichiometry, which were not investigated up to now. The emission spectra recorded at low temperature exhibits new peaks at 13555 and 13415 cm(-1) T he measurement of the fluorescence decays and the recording of the excitati on spectra monitored at all the emission peaks were performed in order to d etermine the different Cr3+ centres in lithium niobate as well as their ene rgy levels contributing to the emission experiments. Three Cr3+ centres per mit to describe the various features of the emission spectra. The main cent re corresponds to the weak crystal field scheme and yields the broad emissi on band as well as the new peaks which have a vibronic origin. The two othe r Cr3+ centres agree with the high crystal field scheme and display the sha rp R-lines at 13685 and 13614 cm(-1). (C) 1999 Published by Elsevier Scienc e B.V. All rights reserved.