The invention provides lanthanide chelates capable of intense luminescence. The celates comprise a lanthanide chelator covalently joined to a coumarin-like or quinolone-like sensitizer. Exemplary sensitzers include 2- or 4-quinolones, 2- or 4-coumarins, or derivatives thereof e.g. carbostyril 124 (7-amino-4-methyl-2-quinolone),...http://www.google.com.au/patents/US5639615?utm_source=gb-gplus-sharePatent US5639615 - Luminescent lanthanide chelates and methods of use
