Three-color organic light-emitting diodes patterned by masked dye diffusion

A method of masked dye diffusion to locally pattern the emissive color of organic light-emitting devices (OLEDs) over a large area is introduced. By using a large-area diffusion source, which may be a spin-coated doped polymer film, the entire process of masked diffusion of dye into a polymer film of an OLED to create an integrated three-color device has been demonstrated at atmospheric pressure. The materials used to demonstrate this method are the polymer poly(9-vinylcarbazole) combined with electron transport molecules, and the dyes bimane, coumarin 6, and Nile red. (C) 1999 American Institute of Physics.