Additional features are observed in polarized photoluminescence from e
xciton recombination in a spin-polarized GaAs quantum well near fillin
g factor v=1. Upon entering the v=1 quantum Hall state, the main spect
ral line in sigma(-) polarizaiton broadens by more than a factor of 2,
while developing a substantial low-energy tail. In contrast, for sigm
a(+) polarization the line remains narrow at v=1. The large polarizati
on asymmetry results from different initial electron-spin configuratio
ns prior to the recombination. This polarization property, line shape,
and v dependence are consistent with a process of-spin ''shakeup'' th
at generates spin-wave excitations.