Organometallic complexes comprising a trivalent lanthanide metal ion complexed with one or more polydentate ligands containing one or more pyrazolyl-derived groups, such as trispyrazolyl borate species, are useful in light emitting materials e.g., in electroluminescent flat panel displays. In the complexes,...http://www.google.de/patents/US7601859?utm_source=gb-gplus-sharePatent US7601859 - Organometallic complexes
