We present a systematic investigation of transient photoluminescence i
n GaAs V-shaped Quantum Wires as a function of temperature, aimed at t
he understanding of the radiative recombination mechanism of the groun
d level (localized vs free exciton recombination). Exciton localizatio
n energy, density of localization centres and exciton-intrinsic Lifeti
me have been determined from the theoretical analysis of the transient
photoluminescence spectra.