Patent ID: 8734962

Claim:
A phosphorescent metal complex which comprises at least one metallic central atom M and at least one bidentate ligand coordinated by the metallic central atom M, wherein the one metallic central atom M and the bidentate ligand form a six-membered metallacyclic ring, wherein the bidentate ligand which forms a six-membered metallacyclic ring with the metallic central atom has a tautomerizable unit in the uncoordinated state, the metallic central atom M is selected from a group which comprises Ir, Pt, Au, Re, Rh, Ru, Os, Pd, Ag, Zn, Al and lanthanoids, the six-membered metallacyclic ring has a structural formula selected from the group which comprises where: n=1 to 3, Y=C—H, N, P, As, Sb, C—R y , Si—R y , Ge—R y , X=O, P, As, Sb, X 1 , X 2 , X 3 , X 4 , X 5 , X 6 , X 7 and X 8 are each independently C or — when R 11 , R 12 , R 3 , R 14 , R 15 , R 6 , R 7 or R 8 includes a free electron pair —N, R y , R 11 , R 12 , R 3 , R 14 , R 15 , R 6 , R 7 , R 8 are each independently H, unbranched alkyl radicals, branched alkyl radicals, fused alkyl radicals, cyclic alkyl radicals, fully or partly substituted unbranched alkyl radicals, fully or partly substituted branched alkyl radicals, fully or partly substituted fused alkyl radicals, fully or partly substituted cyclic alkyl radicals, alkoxy groups, amines, amides, esters, carbonates, aromatics, fully or partly substituted aromatics, fused aromatics, fully or partly substituted fused aromatics, heterocycles, fully or partly substituted heterocycles, fused heterocycles, fully or partly substituted heterocycles, F and CN.