Patent ID: 8410270

Claim:
A metal complex, comprising a ligand of formula (I): wherein: Y 5 and Z 4 are each independently CD, CR 1 , CH, or N; D is deuterium; X 1 is N; X 2 , X 3 , Y 1 , Y 2 , and Y 3 are each independently N or C; X 4 is CD, CR 1 , CH, N, NR 1 , S or O; X 5 is CD; Y 4 and Y 6 are each independently CD, CR 1 , CH, N, NR 1 , S, or O; Z 1 , Z 2 , and Z 3 are each independently CD, CR 1 , CH, or N; R 1 is independently an unsubstituted or substituted alkyl, unsubstituted or substituted cycloalkyl, unsubstituted or substituted heterocycloalkyl, unsubstituted or substituted aryl, unsubstituted or substituted heteroaryl, unsubstituted or substituted alkenyl, unsubstituted or substituted cycloalkenyl, unsubstituted or substituted alkynyl, SiR 2 3 , halogen, a substituent with donor or acceptor action, whereby, in the case that R 1 is bonded to a nitrogen atom, R 1 is independently an unsubstituted or substituted alkyl, unsubstituted or substituted aryl, or unsubstituted or substituted heteroaryl, whereby any two R 1 radicals together may additionally form an alkylene or arylene bridge; R 2 is independently an unsubstituted or substituted alkyl, unsubstituted or substituted aryl, or unsubstituted or substituted heteroaryl; m and n are each 1; and wherein the metal complex comprises a deuterium atom.