Patent ID: 7074503

Claim:
An electroluminescent device comprising a light emitting layer comprising a boron complex wherein the boron is bonded to a nitrogen atom of a first 5-membered heteroaromatic ring group and to a nitrogen atom of a second 5-membered heteroaromatic ring group, provided that the 5-membered rings are further connected by a methene or an imine bridge to form a six-membered ring, and provided further that at least one of the 5-membered rings contains at least one additional heteroatom that is divalent or trivalent, wherein the boron complex is represented by Formula 1, wherein: Ar 1 represents the atoms necessary to form a five-membered heteroaromatic ring; Ar 2 represents the atoms necessary to form a five-membered heteroaromatic ring that contains at least one additional heteroatom that is divalent or trivalent; Y represents N or Câ€”X, wherein X represents a substituent selected from the group consisting of an unsubstituted or substituted heteroaryl group or an unsubstituted aryl group or an aryl group substituted with a substituent selected from halogen, hydroxyl; cyano; carboxyl; alkyl; alkenyl; alkoxy; aryl; aryloxy; carbonamido; sulfonamido; sulfamoyl; carbamoyl; acyl; sulfonyl; sulfonyloxy; sulfinyl; thio; acyloxy; amine; imino; a heterocyclic group, a heterocyclic oxy group or a heterocyclic thio group, each of which may be substituted and which contain a 3 to 7 membered heterocyclic ring composed of carbon atoms and at least one hetero atom selected from the group consisting of oxygen, nitrogen, sulfur, phosphorous, or boron; quaternary ammonium; quaternary phosphonium; and silyloxy; and L 1 and L 2 represent independently selected substituents.