We report measurements of the photophysical behaviour of poly(p-pyridine) (
PPY), including thin film absolute photoluminescence quantum yield, solid a
nd solution state photoluminescence properties. The photoluminescence quant
um yield of PPY is stable in air consistent with its high oxidative stabili
ty. The large stokes shift and further shift in emission in the solid state
will be explained in terms of ring torsion and ring distortion in the exci
ted state.