Absorption and Emission in Quaterthienyl Thin Films


  • The Temple group is supported by the National Science Foundation (grant DMR-0071802). The work at Arizona is partly supported by the National Science Foundation (grant CHE-0078819), the Office of Naval Research, and the IBM Shared University Research Program. The work in Mons is partly supported by the Belgian Federal Services for Scientific, Technical, and Cultural Affairs (InterUniversity Attraction Pole 5/3) and the Belgian National Science Foundation (FNRS). David Beljonne and Jérôme Cornil are Research Associates from FNRS. ZS is supported by the NSFC Grant No. 90203015 and the “973 program” Grant No. 2002CB613406.


The salient features in the absorption and emission spectra of αT4 aggregates (see Figure) and films are fully accounted for using a model based on linear exciton–phonon coupling and structural defects. In particular, the Davydov splitting is calculated to be of the order of 1 eV, and the unusually small 0–0 emission intensity is attributed to the high sensitivity of the 0–0 intensity to basal plane structural defects.