TY - JOUR
T1 - Efficient Exciton Diffusion and Resonance-Energy Transfer in Multi-Layered Organic Epitaxial Nanofibers
AU - Tavares, Luciana
AU - Cadelano, Michele
AU - Quochi, Francesco
AU - Simbrunner, Clemens
AU - Schwabegger , Günther
AU - Saba, Michele
AU - Mura, Andrea
AU - Bongiovanni, Giovanni
AU - da Silva Filho, Demetrio A.
AU - Ferreira da Cunha, Wiliam
AU - Rubahn, Horst-Günter
AU - Kjelstrup-Hansen, Jakob
PY - 2015/7/9
Y1 - 2015/7/9
N2 - 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.
AB - 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.
U2 - 10.1021/acs.jpcc.5b02405
DO - 10.1021/acs.jpcc.5b02405
M3 - Journal article
C2 - 26191119
SN - 1932-7447
VL - 119
SP - 15689
EP - 15697
JO - The Journal of Physical Chemistry Part C
JF - The Journal of Physical Chemistry Part C
IS - 27
ER -