Optical properties of para-hexaphenyl polycrystalline films

We investigate the optical properties and intermolecular coupling of para-hexaphenyl polycrystalline films by site-selective spectroscopy, time-resolved photoluminescence and photoinduced absorption measurements. Our results point to (i) a short-range orientational and energetic disorder and (ii) the molecular character of the light emission, with no evidence of intermolecular excited states.