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

L. Tavares, M. Cadelano, Francesco Quochi, Clemens Peter Simbrunner, Günther Schwabegger, Michele Saba, Andrea Mura, Giovanni Bongiovanni, D. A. da Silva-Filho, W. F. da Cunha, Horst-Günter Rubahn, Jakob Kjelstrup-Hansen

Research output: Contribution to journalArticlepeer-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
Pages (from-to)15689-15697
Number of pages9
JournalThe Journal of Physical Chemistry C
Volume119
DOIs
Publication statusPublished - 2015

Fields of science

  • 210006 Nanotechnology
  • 103 Physics, Astronomy
  • 103011 Semiconductor physics
  • 103018 Materials physics
  • 202032 Photovoltaics
  • 103009 Solid state physics
  • 103017 Magnetism

JKU Focus areas

  • Engineering and Natural Sciences (in general)

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