Band parameters for zinc telluride from bound exciton and donor-acceptor pair excitation luminescence

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Abstract
The valence band parameters for zinc telluride are obtained by fitting shallow impurity excited states with effective mass theory. To obtain a satisfactory fit it is necessary to assume that two-hole bound exciton transitions to excited acceptor states with predominantly d-character are very weak. They conclude that the valence band parameters mu , gamma and delta are respectively 0.58, 3.8 and approximately 0.12. The static dielectric constant is close to 9.2 and the effective mass binding energies of donors, acceptors and free excitons are respectively 18.4 meV, 62.5 meV and 13.3 meV neglecting special polaron coupling effects expected for the acceptor ground state.