Zeeman spectroscopy of luminescence from vanadium-doped indium phosphide

The authors have observed quite strongly-phonon-coupled photoluminescence (PL) in V-doped InP with a sharp no-phonon line near 705 meV and an excited state splitting of 1.55 meV. Detailed Zeeman data on the cold line are reported. The ground state is shown to be a pure spin triplet, g approximately=2 and must arise from the V In 3+ (d 2 ) charge state. The PL is ascribed to transitions between the 3 T 2 ( 3 F)- 3 A 2 ( 3 F) levels of V In 3+ . A marked tetragonal anisotropy is found in the excited states of the transitions. This is tentatively attributed to an almost static Jahn-Teller effect in the 3 T 2 ( 3 F) state. A similar attribution is proposed for qualitatively similar PL spectra observed by U. Kaufmann et al. (1982) in GaAs and GaP.