Patent ID: 7691495

Claim:
A heterostructured organic light-emitting device comprising at least one emissive layer, at least one host material and at least one dopant complex in the emissive layer, wherein the dopant in the emissive layer is a compound having the following structure: or a mixture of above compounds, wherein M is a Ni, Pd or Pt; each R 1 -R 8 is independently —H, —OH, —NH 2 , -halogen, —CN, —NO 2 , —R 11 , —OR 11 , NHR 12 , or —N(R 12 ) 2 ; R 10 is —(C(R 13 ) 2 ) n -, each R 9 is independently —H, —(C 1 -C 6 )alkyl, -phenyl, -naphthyl; -halogen, or —CN; R 11 is —(C 1 -C 6 )alkyl, -phenyl, or -naphthyl, each of which is unsubstituted or substituted with one or more —(C 1 -C 6 )alkyl, -phenyl, or -naphthyl; R 12 is as defined above for R 11 ; and R 13 is as defined above for R 1 ; each x is independently a carbon or nitrogen atom; and n is an integer from 1 to 6.