Patent ID: 7160634

Claim:
An organic electroluminescent device, which comprises an organic layer between a pair of electrodes, and the organic layer comprises at least one layer containing a vinyl polymer comprising a unit represented by the following formula (2): wherein R 1 and R 2 are the same or different, each representing a hydrogen atom, a halogen atom, an alkyl group or an alkoxy group; wherein the organic layer comprises (a) a hole-transporting layer containing the vinyl polymer, a light-emitting layer and an electron-transporting layer, or (b) a hole-transporting layer containing the vinyl polymer and a light-emissive electron-transporting layer, and an anode buffer layer is interposed between the hole-transporting layer and an anode of the electrodes, and wherein the anode buffer layer comprises a poly(3,4-ethylenedioxythiophene) chemically doped with a polystyrene.