Issue Eur. Phys. J. Appl. Phys. Volume 24, Number 3, December 2003 Page(s) 195 - 200 Section Surfaces, Thin Foils and Nanomaterials DOI 10.1051/epjap:2003067 Published online 16 September 2003

Eur. Phys. J. Appl. Phys. 24, 195-200 (2003)
DOI: 10.1051/epjap:2003067

Degradation kinetics of the spectral emission in polyfluorene light-emitting electro-chemical cells and diodes

T. Ouisse¹, O. Stéphan¹ and M. Armand<sup>2

1</sup>  Laboratoire de Spectrométrie Physique, Université Joseph Fourier, Grenoble 1 and CNRS UMR C5588, 140 rue de la physique, BP 87, 38042, Saint-Martin d'Hères Cedex, France
²  Laboratoire International sur les Matériaux Électroactifs, CNRS, UMR 2289, Université de Montréal, CP 6128, Montréal QC H3C 3J7, Canada

ouisse@spectro.ujf-grenoble.fr

(Received: 21 March 2003 / Received in final form: 4 July 2003 / Accepted: 10 July 2003 Published online: 16 September 2003 )

Abstract
We have studied the well known spectral shift of polyfluorene blue light emitters, using either electrochemical cells or conventional organic light emitting diodes. From the recording of the electroluminescence spectra as a function of "stress" time, we conclude that the degradation mainly depends on the number of electrons which have passed through the conducting polymer, rather than on the hole current magnitude or the dissipated power.

PACS
73.61.Ph - Polymers; organic compounds.
72.80.Le - Polymers; organic compounds (including organic semiconductors).
85.60.Jb - Light-emitting devices.

© EDP Sciences 2003

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