The eﬀects of intermolecular interactions on the photoluminescence (PL) quantum eﬃciency of diﬀerently substituted thienylene-S,S-dioxide derivatives in the crystalline phase are investigated. The exciton resonance interactions and the transfer integrals are evaluated using a quantum chemistry approach by considering the supramolecular structures obtained from X-ray data. Two classes of thienylene-S,S-dioxides are investigated: (1) rigid, fused ring compounds, for which the PL quantum eﬃciency can be well correlated with the rate of formation of non-radiatively decaying charge-transfer pairs upon photoexcitation; (2) ﬂexible oligothiophenes for which the high PL quantum eﬃciency in the solid-state is assigned to a decrease of intramolecular internal conversion process, as conﬁrmed by time-resolved PL measurements in solvents of diﬀerent viscosity.
|Autori:||F. Della Sala; G. Gigli; M. F. Raganato; M. Anni; D. Pisignano; R. Cingolani; L. Favaretto; G. Sotgiu; G. Barbarella; and L. Antolini|
|Titolo:||Effects of Intermolecular Interactions on Photoluminescence Efficiency of Crystalline Thienylene-S,S-Dioxide Molecular Semiconductors|
|Anno del prodotto:||2004|
|Digital Object Identifier (DOI):||10.1016/j.orgel.2003.11.002|
|Appare nelle tipologie:||1.1 Articolo in rivista|