Efficient Exciton Diffusion and Resonance-Energy Transfer in Multi-Layered Organic Epitaxial Nanofibers

Luciana Tavares, Michele Cadelano, Francesco Quochi, Clemens Simbrunner, Günther Schwabegger , Michele Saba, Andrea Mura, Giovanni Bongiovanni, Demetrio A. da Silva Filho, Wiliam Ferreira da Cunha, Horst-Günter Rubahn, Jakob Kjelstrup-Hansen

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Multilayered epitaxial nanofibers are exemplary model systems for the study of exciton dynamics and lasing in organic materials because of their well-defined morphology, high luminescence efficiencies, and color tunability. We use temperature-dependent continuous wave and picosecond photoluminescence (PL) spectroscopy to quantify exciton diffusion and resonance-energy transfer (RET) processes in multilayered nanofibers consisting of alternating layers of para-hexaphenyl (p6P) and α-sexithiophene (6T) serving as exciton donor and acceptor material, respectively. The high probability for RET processes is confirmed by quantum chemical calculations. The activation energy for exciton diffusion in p6P is determined to be as low as 19 meV, proving p6P epitaxial layers also as a very suitable donor material system. The small activation energy for exciton diffusion of the p6P donor material, the inferred high p6P-to-6T resonance-energy-transfer efficiency, and the observed weak PL temperature dependence of the 6T acceptor material together result in an exceptionally high optical emission performance of this all-organic material system, thus making it well suited, for example, for organic light-emitting devices.

Original languageEnglish
JournalThe Journal of Physical Chemistry Part C
Volume119
Issue number27
Pages (from-to)15689-15697
ISSN1932-7447
DOIs
Publication statusPublished - 9. Jul 2015

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