The dynamics of one-dimensional (1D) excitons is investigated in a GaA
s/AlAs quantum wire array (QWR-A) using picosecond time resolved photo
luminescence (PL) measurements. The excitation density is 4 x 10(4) cm
(-1), a factor of 20 below the Mott density. The rise and decay time c
onstants of the excitonic PL in the QWR-A are 55 and 450 psec, respect
ively. The exciton formation time in 1D is determined to be approximat
e to 30 psec. Our results suggest that exciton-acoustic-phonon scatter
ing is enhanced in 1D. However, the rates of exciton scattering with c
arriers and excitons is reduced. [S001-9007(98)07167-1].