A material for electroluminescence devices comprising an aromatic amine derivative having a specific structure having bulky substituents at end portions and an organic electroluminescence device comprising an organic thin film layer which comprises a single layer or a plurality of layers comprising at...http://www.google.de/patents/US20080102311?utm_source=gb-gplus-sharePatent US20080102311 - MATERIAL FOR ORGANIC ELECTROLUMINESCENT ELEMENT AND ORGANIC ELECTROLUMINESCENT ELEMENT EMPLOYING THE SAME
