  Photoluminescence (PL) has been used to study two-dimensional incompressible
electron liquids in high magnetic fields for nearly two decades. However, some
of the observed anomalies coincident with the fractional quantum Hall effect
are still unexplained. We show that emission in these systems occurs from
fractionally charged "quasiexciton" states formed from trions correlated with
the surrounding electrons. Their binding and recombination depend on the state
of both the electron liquid and the involved trion, predicting discontinuities
in PL and sensitivity to sample parameters.
