Piezospectroscopy of vanadium-doped indium phosphide

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Abstract
The authors have studied the 705.45 meV photoluminescence (PL) zero-phonon line (ZPL) of vanadium-doped InP and the 993 meV ZPL observed in the excitation spectrum of the 705 meV PL band. The behaviour of these lines under uniaxial stress indicates a tetragonal distortion in the initial state of the PL and a trigonal distortion in the final state of the excitation transition. These different symmetries suggest very strongly that the distortions arise from Jahn-Teller coupling. They are consistent with the assignments of Skolnick and co-workers (1983) to crystal-field transitions of VIn3+ (d2). Evidence that the same assignments apply to the similar PL bands of GaAs:V and GaP:V is provided by the structure of their ZPLs. The phonon coupling of crystal-field levels of Co2+ and V3+ in III-V semiconductors is compared. It is suggested that in all these systems the T2(F) levels are weakly coupled to epsilon modes, and the T1(F) levels are strongly coupled to tau 2 modes.