996 resultados para Diodes organiques électroluminescentes


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Thesis (doctoral)--Universite de Geneve.

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Thesis (doctoral)--Universite de Lausanne.

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Thesis (doctoral)--Universite de Geneve.

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Thesis (doctoral)--

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"M. Isidore Geoffroy Saint-Hilaire est mort ... avant d'avoir terminé l'œuvre qu'il avait entreprise ... les chapitres XVIII, XIX et XX n'étaient qu'en manuscrit. La famille ... a pensé que ce manuscrit devait être publié sans additions ni retranchements, et elle a livré à l'impression jusqu'aux dernières pages écrites par l'auteur": v. 3, p. [531]

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Organic microcavity light emitting diodes typically exhibit a blue shift of the emitting wavelength with increasing viewing angle. While the wavelength shift can be reduced with the appropriate choice of organic materials and metal mirrors, for further reduction of the emission wavelength shift it is necessary to consider a mirror whose phase shift can partly compensate the effect of the change of optical path within the cavity. In this work, we used a genetic algorithm (GA) to design an asymmetric Bragg mirror in order to minimize the emission wavelength shift with viewing angle. Based on simulation results, the use of asymmetric Bragg mirrors represents a promising way to reduce the emission wavelength shift. Detailed comparison between GA optimized and conventional Bragg mirrors in terms of resonant wavelength dependence on the viewing angle, spectral narrowing, and brightness enhancement is given. (C) 2004 Elsevier B.V. All rights reserved.