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Proceedings Paper

Interference effects in polymer light-emitting diodes
Author(s): Franco Cacialli; Seamus E. Burns; H. Becker
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Paper Abstract

We report an experimental and theoretical study of the effects of interference in polymeric light-emitting diodes (LEDs). These effects are due to the complex optical structures of the devices, which include many layers of materials with different refractive indices, and are of considerable importance since they affect spectral distribution and intensity of the absorption and emission in a significant way. By way of comparison, they can also provide a flexible, non-invasive optical probe of the electroluminescent processes. In this paper we analyze single-layer diodes with indium-tin oxide (ITO) and Al electrodes, where poly (p-phenylene vinylene) (PPV) is the luminescent polymer. We find that photo-induced excitation of the radiative species produce different spectral shapes depending on the excitation energy which we can describe in terms of interference phenomena. The theoretical analysis is conducted by means of multilayer stack theory and transfer matrix calculations, and takes into account additional quenching effects due to In contaminations from the ITO electrode. The theoretical results are in good agreement with the experiment.

Paper Details

Date Published: 1 December 1997
PDF: 8 pages
Proc. SPIE 3148, Organic Light-Emitting Materials and Devices, (1 December 1997); doi: 10.1117/12.284180
Show Author Affiliations
Franco Cacialli, Cambridge Univ. (United Kingdom)
Seamus E. Burns, Cambridge Univ. (United Kingdom)
H. Becker, Cambridge Univ. (United Kingdom)

Published in SPIE Proceedings Vol. 3148:
Organic Light-Emitting Materials and Devices
Zakya H. Kafafi, Editor(s)

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