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Optical properties of polycrystalline films |
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| Authors: | A. Piaggi G. Lanzani G. Bongiovanni M. A. Loi A. Mura W. Graupner F. Meghdadi G. Leising |
| Affiliation: | a Istituto di Matematica e Fisica and Istituto Nazionale per la Fisica della Materia, Uniuersita di Sassari, 07100, Sassari, Italy b Dipartimento di Scienze Fisiche and Istituto Nazionale per la Fisica della Materia, Uniuersita di Cagliari, 09124, Cagliari, Italy c Institut fair Festkörperphysik Technische Uniuersität Graz, 8010, Graz, Austria |
| Abstract: | 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. |
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