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Crystal‐Field Analysis of Er 3+ Emission Spectrum in Epitaxial Ca 1–x Er x F 2+x Thin Films
Author(s) -
Maalej R.,
Chehaidar A.,
Kamoun M.
Publication year - 2000
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/1521-3951(200010)221:2<657::aid-pssb657>3.0.co;2-7
Subject(s) - crystal (programming language) , epitaxy , ion , symmetry (geometry) , thin film , field (mathematics) , center (category theory) , doping , crystallography , chemistry , analytical chemistry (journal) , materials science , condensed matter physics , physics , nanotechnology , geometry , mathematics , organic chemistry , layer (electronics) , chromatography , computer science , pure mathematics , programming language
A detailed crystal‐field analysis, based on the Racah theory, was carried out for the two isolated interstitial‐fluoride charge‐compensation centers of Er 3+ ion doped in CaF 2 crystal, termed A and B centers. Assuming the C 4v and C 3v site symmetry, respectively, two sets of crystal‐field parameters were obtained by a least‐squares fitting of the optical data of Er 3+ ion diluted in epitaxial Ca 1– x Er x F 2+ x thin film. This theoretical analysis confirms the expected C 4v site symmetry for the A center. For the B center, however, the site symmetry is not exactly C 3v in contrast to what is believed.