Fabrication of Multi Color Polymer EL Devices using the Photo-bleaching Method

摘要

Several kinds of multi color polymer EL devices were fabricated by means of the photo-bleaching method. Poly(N-vinylcarbazole)(PVK) was dispersed with photo-bleaching dopants having green or yellow fluorescent colors. In order to tune the emission color and pattern the device, the PVK emitter layer was exposed to specific lights after formed by spin coationg so that a specific dye is photo-bleached and becomes non-emissive. Green and blue (G-B), two color and yellow, green and blue (Y-G-B), three color devices were fabricated successfully.