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Linear electroabsorption due to substitutional deep impurities in wurtzite‐type crystals: II. Experimental study of Co 2+ in CdS and CdSe
Author(s) -
Gardavský J.,
Boyn R.
Publication year - 1975
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/pssb.2220680215
Subject(s) - wurtzite crystal structure , impurity , condensed matter physics , linear polarization , spectral line , polarization (electrochemistry) , materials science , absorption spectroscopy , electric field , field (mathematics) , excited state , hexagonal crystal system , chemistry , crystallography , atomic physics , optics , physics , quantum mechanics , laser , mathematics , organic chemistry , astronomy , pure mathematics
Abstract Measurements are made of linear electroabsorption spectra in the range of the 4 A 2 → 4 T 1 ( 4 F) and 4 A 2 → 4 T 1 ( 4 P) absorption bands of substitutional Co 2+ in CdS and CdSe crystals for electric fields parallel and perpendicular to the hexagonal c ‐axis, at 77 and 300 K. The observed dependences of these spectra on field and polarization direction can be completely explained on the basis of the theoretical treatment given in the first part of this work. A moment analysis is performed for CdS: Co 2+ , and this leads to values for the linear Stark splittings and field‐induced changes in transition probability. The axial crystalfield splittings of the T, excited levels of CdS: Co 2+ are also determined, and their similarity to the external field splittings for F ‖ c is emphasized.