  We study the particle-hole exciton mode in the QED3 theory of a
phase-fluctuating d-wave superconductor in ladder approximation. We derive a
Schroedinger-like equation for the exciton bound state and determine the
conditions for its existence. We find the dispersion of this mode below the
particle-hole continuum and compare our results with the resonance observed in
neutron scattering measurements in cuprates.
