Contrôle de la couleur d'émission d'une Diode Electro-Luminescente Organique (OLED) multicouche via la diffusion des excitons.

Abstract : This work reports on color control of organic light-emitting diodes (OLEDs), which are the basic devices for flat displays and future solid state-lighting sources, by investigating excitons diffusion. After optimization of the thickness of fluorescent yellow emitters incorporated in a blue-emitting matrix, their position shifts from the recombination zone leads to a fine tuning of the emission color of the OLED. By this way, a pure blue, a pure yellow and a pure white emission with chromatic coordinates (0.32; 0.33) is obtained. This control of color emission of the OLED is due to excitons diffusion in the device ; a study of singlets and triplets excitons diffusion is proposed. From electroluminescence spectra measurements, singlets diffusion lengths are investigated in two well-known materials, namely NPB and the DPVBi. In the case of triplets excitons, a new structure, using a thick CBP matrix doped by a phosphorescent dye, is proposed. Taking into account microcavity effects, the triplet exciton diffusion length in CBP is determined.
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https://tel.archives-ouvertes.fr/tel-00325677
Contributor : Hakim Choukri <>
Submitted on : Sunday, October 5, 2008 - 3:58:09 PM
Last modification on : Wednesday, February 6, 2019 - 1:25:48 AM
Long-term archiving on : Tuesday, September 21, 2010 - 5:34:28 PM

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Hakim Choukri. Contrôle de la couleur d'émission d'une Diode Electro-Luminescente Organique (OLED) multicouche via la diffusion des excitons.. Physique [physics]. Université Paris-Nord - Paris XIII, 2008. Français. ⟨tel-00325677v2⟩

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