An organic electroluminescent device includes at least two light-emissive units provided between a cathode electrode and an anode electrode opposed to the cathode electrode, each of the light-emissive units including at least one light-emissive layer. The light-emissive units are partitioned from each...http://www.google.de/patents/US20030189401?utm_source=gb-gplus-sharePatent US20030189401 - Organic electroluminescent device