Three-Color Doping of Polymer Oleds by Masked Dye Diffusion


A method to locally pattern the distribution of dye by diffusion into the polymer film of organic light-emitting diodes is introduced. Using a large-area diffusion source, the diffusion of dye into the polymer film can be controlled with a shadow mask. The materials used are the polymer poly(9-vinylcarbazole) (PVK) combined with electron transport molecules (PBD), and the dyes bimane, coumarin 6 and Nile red. The temperature dependence of the diffusion is investigated along with the effect of annealing of the polymer film. A model of the dye distribution is introduced and estimations of the dye profile based on this model and PL measurement are discussed. A 3-color integrated device was demonstrated.

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Correspondence to F. Pschenitzka.

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Pschenitzka, F., Sturm, J.C. Three-Color Doping of Polymer Oleds by Masked Dye Diffusion. MRS Online Proceedings Library 558, 513–518 (1999).

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