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Controlling the optical emission from the polymer MEH-PPV using corrugated thin films

Published online by Cambridge University Press:  15 May 2002

J. A. E. Wasey ,
A. Safonov ,
M. J. Jory ,
I. D. W. Samuel  and
W. L. Barnes
J. A. E. Wasey
Affiliation:
Thin Film Photonics Group, School of Physics, University of Exeter, Exeter, EX4 4QL, UK
A. Safonov
Affiliation:
Department of Physics, University of Durham, South Road, Durham, DH1 3LE, UK
M. J. Jory
Affiliation:
Thin Film Photonics Group, School of Physics, University of Exeter, Exeter, EX4 4QL, UK
I. D. W. Samuel
Affiliation:
Polymer Optoelectronics Research Group School of Physics and Astronomy, University of St. Andrews, North Haugh,
W. L. Barnes*
Affiliation:
Thin Film Photonics Group, School of Physics, University of Exeter, Exeter, EX4 4QL, UK
*
idws@st-andrews.ac.uk
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Abstract

We report measurements of photoluminescence from corrugated thin films of a light-emitting polymer. We find that emission into guided modes that would otherwise be trapped in the polymer may Bragg scatter off the corrugation to produce useful, far-field radiation. Analysis of the angle dependence of this far-field emission together with theoretical modeling enables us to establish the nature of the optical modes guided by the structure. We show that the dispersion of the modes supported by corrugated polymer films depends on the depth of modulation of the corrugation and find that if the periodic corrugation is strong enough photonic band gap effects may be induced. We also address the question of whether Bragg-scattering of the guided modes, including surface plasmon polariton modes, may increase the efficiency of the emission. We measure and compare the efficiency with which radiation is produced by planar and corrugated structures, finding the corrugated structures to be up to a factor of 2.6 more efficient. We indicate how our results may be used in the search for ways to improve the efficiency of devices based on light emitting thin films.

Keywords

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 18 , Issue 2 , May 2002 , pp. 89 - 97
Copyright
© EDP Sciences, 2002

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