Organic element for electroluminescent devices

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:
• Ar1 represents the atoms necessary to form a five-membered heteroaromatic ring;
• Ar2 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 C—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
• L1 and L2 represent independently selected substituents.