The magneto-optical properties of the 0.9eV luminescence were investigated. Zero-phonon lines at 0.943eV were attributed to a transition, within a d2 configuration, because of a characteristic 3-fold ground-state splitting in magnetic fields. A g-value of 1.96 and a zero-field splitting of 120μeV were determined for the 3A2(F) ground state. On the basis of the temperature dependence in a magnetic field, the 0.943eV zero-phonon line was attributed to the 1E(D)-3A2(F) transition of isolated V3+.

P.Thurian, I.Loa, P.Maxim, A.Hoffmann, C.Thomsen, K.Pressel: Applied Physics Letters, 1997, 71[20], 2993-5