3 January 1996 Covalent effects and optical spectra of transition metal impurities in semiconductors
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Proceedings Volume 2706, Tenth Feofilov Symposium on Spectroscopy of Crystals Activated by Rare-Earth and Transitional-Metal Ions; (1996) https://doi.org/10.1117/12.229159
Event: Tenth Feofilov Symposium on Spectroscopy of Crystals Activated by Rare Earth and Transitional Ions, 1995, St. Petersburg, Russian Federation
Abstract
Covalent interaction of the electrons from the unfilled d-shell of transition metal impurities in semiconductors with ligands results in swelling the d-electron wave functions. Several obvious results of this are a drastic increase of the absorption cross-section (antenna effect), lifting of bans for some dipole transitions due to mixing of the states with different parities. A less obvious consequence is a possibility of lines complementing the intracenter transitions to the forbidden energy gap. They appear due to multielectron structure of the d-shells and become observable in the luminescence due to an interference of the covalent effects and the electron phonon interaction. The same effects lead to a long living metastable electronically excited 2E configuration of the d atom. As a result observation of the complementing lines in the absorption also becomes possible.
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V. Fleurov, P. Dahan, "Covalent effects and optical spectra of transition metal impurities in semiconductors", Proc. SPIE 2706, Tenth Feofilov Symposium on Spectroscopy of Crystals Activated by Rare-Earth and Transitional-Metal Ions, (3 January 1996); doi: 10.1117/12.229159; https://doi.org/10.1117/12.229159
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