An organic electroluminescent device having an anode, an organic hole injection transport layer, an organic luminescent layer and a cathode formed sequentially in this order, wherein the organic hole injection transport layer contains a metal complex and/or a metal salt of an aromatic carboxylic aci...http://www.google.es/patents/US5247226?utm_source=gb-gplus-sharePatente US5247226 - Organic electroluminescent device
