A dynamical Jahn-Teller effect has been proposed to interpret the fine structure of the luminescence spectra of V2+ impurities in ZnS and ZnSe. The ground 4F term of the impurity is split by the crystal field into three multiplets. The spin-orbit and the spin-spin interactions are taken into account as well as a linear Jahn-Teller coupling with a trigonal phonon mode, both on the ground 4T1 multiplet and on the excited 4T2 multiplet. The Lanczos-recursion procedure with a proper choice of the initial state is followed to calculate the vibronic states. A comparison with experimental energies and intensities indicates that a dynamical Jahn-Teller effect plays an important role to explain the fine structure of the luminescence spectra of ZnSe:V2+ and ZnS:V2+. In the latter, the temperature effects present in the spectra are also accounted for by the resulting energy-level scheme.

Bevilacqua, G., Martinelli, L., Vogel, E.E. (2002). Jahn-Teller effect and the luminescence spectra of V^2+ in ZnS and ZnSe. PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS, 66, 155338-1-155338-5 [10.1103/PhysRevB.66.155338].

Jahn-Teller effect and the luminescence spectra of V^2+ in ZnS and ZnSe

BEVILACQUA, G.;
2002

Abstract

A dynamical Jahn-Teller effect has been proposed to interpret the fine structure of the luminescence spectra of V2+ impurities in ZnS and ZnSe. The ground 4F term of the impurity is split by the crystal field into three multiplets. The spin-orbit and the spin-spin interactions are taken into account as well as a linear Jahn-Teller coupling with a trigonal phonon mode, both on the ground 4T1 multiplet and on the excited 4T2 multiplet. The Lanczos-recursion procedure with a proper choice of the initial state is followed to calculate the vibronic states. A comparison with experimental energies and intensities indicates that a dynamical Jahn-Teller effect plays an important role to explain the fine structure of the luminescence spectra of ZnSe:V2+ and ZnS:V2+. In the latter, the temperature effects present in the spectra are also accounted for by the resulting energy-level scheme.
Bevilacqua, G., Martinelli, L., Vogel, E.E. (2002). Jahn-Teller effect and the luminescence spectra of V^2+ in ZnS and ZnSe. PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS, 66, 155338-1-155338-5 [10.1103/PhysRevB.66.155338].
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11365/21648
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