  The photoluminescence (PL) spectrum of a two-dimensional electron gas (2DEG)
in the fractional quantum Hall regime is studied as a function of the
separation $d$ between the electron and valence hole layers. The abrupt change
in the response of the 2DEG to the optically injected hole at $d$ of the order
of the magnetic length $\lambda$ results in a complete reconstruction of the PL
spectrum. At $d<\lambda$, the hole binds one or two electrons to form neutral
($X$) or charged ($X^-$) excitons, and the PL spectrum probes the lifetimes and
binding energies of these states rather than the original correlations of the
2DEG. At $d>2\lambda$, depending on the filling factor $\nu$, the hole either
decouples from the 2DEG to form an ``uncorrelated'' state $h$ or binds one or
two Laughlin quasielectrons (QE) to form fractionally charged excitons $h$QE or
$h$QE$_2$. The strict optical selection rules for bound states are formulated,
and the only optically active ones turn out to be $h$, $h$QE* (an excited state
of the dark $h$QE), and $h$QE$_2$. The ``anyon exciton'' $h$QE$_3$ suggested in
earlier studies is neither stable nor radiative at any value of $d$. The
critical dependence of the stability of different states on the presence of
QE's in the 2DEG explains the observed anomalies in the PL spectrum at
$\nu={1\over3}$ and ${2\over3}$.
