Color tunability in non-doped single-layer PLEDs from a carbazole-based electroluminescent polymer

摘要

A conjugated polymer with a carbazole moiety, poly(3,6-divinylene-N-octyl-carbazole-p-phenylene), was synthesized by Wittig reaction. The polymer can be dissolved in common organic solvents such as THF, chloroform, etc. Using this polymer as an active layer, single-layer non-doped PLEDs with different thicknesses were fabricated by a spin-coating approach. The results suggested that electroluminescence spectra are changed with the film thickness of the polymer emitter. Fortunately, CIE 1931 coordinate values are moved to the white-light region only by changing the film thickness.