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Emission properties of an organic light-emitting diode patterned by a photoinduced autostructuration process

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6 Author(s)
Hubert, C. ; Commissariat à l’Energie Atomique de Saclay, Direction des Recherches Technologiques LITEN/DSEN/SPVS, Organic Devices Group, Bâtiment 451, 91191 Gif-sur-Yvette, France ; Fiorini-Debuisschert, C. ; Hassiaoui, I. ; Rocha, L.
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The photoluminescence properties of a periodically structured organic light-emitting diode are presented. Patterning is achieved using an original single-step autostructuration technique based on photoinduced effects in azo-polymer films. We show that single beam laser irradiation can lead to the induction of regular two-dimensional surface relief gratings. The waveguide properties of these microstructures as well as their effect on the emission properties of a light-emitting material are studied. We demonstrate a new straightforward technique to improve external light emission efficiency by outcoupling part of the light that was initially guided into the different diode layers.

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Applied Physics Letters  (Volume:87 ,  Issue: 19 )