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Multiband Laser Action from Organic-Organic Heteroepitaxial Nanofibers

Published online by Cambridge University Press:  04 February 2014

Francesco Quochi
Affiliation:
Department of Physics – University of Cagliari, S.P. Monserrato-Sestu Km 0.7, I-09042 Monserrato (CA), Italy.
Francesco Floris
Affiliation:
Department of Physics – University of Pavia, Via Agostino Bassi 6, I-27100 Pavia (PV), Italy.
Clemens Simbrunner
Affiliation:
Institute of Semiconductor and Solid State Physics, University Johannes Kepler of Linz, Austria
Guenther Schwabegger
Affiliation:
Institute of Semiconductor and Solid State Physics, University Johannes Kepler of Linz, Austria
Michele Saba
Affiliation:
Department of Physics – University of Cagliari, S.P. Monserrato-Sestu Km 0.7, I-09042 Monserrato (CA), Italy.
Andrea Mura
Affiliation:
Department of Physics – University of Cagliari, S.P. Monserrato-Sestu Km 0.7, I-09042 Monserrato (CA), Italy.
Helmut Sitter
Affiliation:
Institute of Semiconductor and Solid State Physics, University Johannes Kepler of Linz, Austria
Giovanni Bongiovanni
Affiliation:
Department of Physics – University of Cagliari, S.P. Monserrato-Sestu Km 0.7, I-09042 Monserrato (CA), Italy.
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Abstract

We report successful tuning of laser wavelength from ∼420 nm to ∼600 nm in epitaxially aligned nanofibers grown by periodic deposition of para-sexiphenyl (p6P) and sexithiophene (6T) on p-6P/muscovite mica templates. The nanofibers were photoexcited by subpicosecond pulses tuned to the lowest p6P absorption band, and the emission of 6T, whose coverage was kept in the submonolayer regime, was efficiently sensitized through resonance energy transfer (RET).

The 6T lasing was achieved at room temperature with threshold fluences as low as 10 μJ/cm2 per pulse. Transient photoluminescence measurements, with picosecond resolution, showed that at these pump fluences the decay dynamics of 6T emission is independent of the excitation density, thereby demonstrating the attainment of room-temperature monomolecular lasing from epitaxially oriented 6T submonolayer aggregates. Main lasing properties remained unaltered upon direct photoexcitation of 6T below the p6P absorption edge.

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Articles
Copyright
Copyright © Materials Research Society 2014 

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References

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Multiband Laser Action from Organic-Organic Heteroepitaxial Nanofibers
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