Unified explanation for optical and high-pressure spectra of Ni2+ ions in ZnS crystal Original Research Article

The optical spectra of ZnS:Ni2+ are explained on the basis of both the complete energy matrix diagonalization procedure (CDP) and the crystal-field-like model. The calculated d–d transitions agree well with experimental data. The calculations are then extended to include the effects of pressure using the experimentally established equation of state of ZnS. The estimated pressure coefficients are also in agreement with experimental results.