Abstract
The assignment of the 1.193 eV zero-phonon line of the 3d2 ion in GaN crystal to theinternal luminescence of Cr4+ on the Ga3+ site is analysed. Based on thisassignment, the g-shift Δg ( = g-gs) of the groundstate of this luminescence iscalculated by considering not only the conventional contribution due to thecrystal-field mechanism, but also the contribution due to charge-transfermechanism. The calculated result shows good agreement with the observed value,suggesting that the assignment is reasonable. The calculated Δg due to thecharge-transfer mechanism is opposite in sign and 62% in magnitude, comparedwith that due to the crystal-field mechanism, and so it cannot be neglected. Itappears that for the 3d2 (or 3dn) ion with a high valence state in crystals(particularly, in the case of the ligand having small optical electronegativity),the reasonable explanation of the g-shift should consider the contributions fromboth the crystal-field and charge-transfer mechanisms.
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