Abstract
Infrared luminescence spectra of Fe2+ in II-VI zinc-blende structures show more than 4 unequally spaced lines. To explain such experimental features, we introduce a Jahn-Teller coupling to acoustical phonons of E symmetry. We apply and compare two independent methods: Born-Oppenheimer’s and Lanczos’. Additionally we investigate the role of higher-order corrections such as spin-spin and third-order spin-orbit contributions to accurate calculation of energy levels. Details of the emission spectra of ZnS : Fe 2+, ZnSe : Fe 2+, ZnTe : Fe 2+, and CdTe : Fe 2+ are explained as due to a weak Jahn-Teller coupling which is enhanced when the energy of the coupling phonon is close to the spacing between electronic levels of appropriate symmetry.
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Bevilacqua, G. et al. (2001). Fine Interactions and the Jahn-Teller Effect in Luminescence of FE 2+ in II-VI Compounds. In: Kaplan, M.D., Zimmerman, G.O. (eds) Vibronic Interactions: Jahn-Teller Effect in Crystals and Molecules. NATO Science Series, vol 39. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-0985-0_48
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DOI: https://doi.org/10.1007/978-94-010-0985-0_48
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