Three-color polymer light-emitting devices patterned by maskless dye diffusion onto prepatterned electrode

A simple technique of maskless dye diffusion into polymer films on prepatte rned electrodes is developed and three-color polymer light-emitting devices were successfully fabricated on a glass plate. In this method, prepatterne d electrodes beneath precoated receiver film are utilized as heaters for ac tivating dye molecules. Upon doping with three types of dye, 1,1,4:4 tetrap henyl-1,3-butadiene, coumarin 6 and Nile red into poly(N-vinylcarbazole) by the present diffusion method, blue: green and red emissions were obtained. It is found that the onset voltage of emission does not depend on the type of dye. The maskless dye diffusion technique can be applicable to a variet y of devices such as photovoltaic devices.