Patent ID: 7029765

Claim:
An organic light emitting device comprising an array of pixels defined by a photoresist grid and having a pixel pitch of less than 500 μm, wherein each pixel comprises an emissive layer comprising a phosphorescent emissive material of the formula VII M is a metal atom; each R 1 , R 2 , R 3 , R 4 , R 9 , R 10 , R 11 , and R 12 is, independently, H, F, Cl, Br, I, R, OR, N(R) 2 , SR, C(O)R, C(O)OR, C(O)N(R) 2 , CN, NO 2 , SO 2 , SOR, SO 2 R, SO 3 R; and additionally, or alternatively, any one or more of R 1 and R 2 , or R 2 and R 3 , or R 3 and R 4 , or R 9 and R 10 , or R 10 and R 11 , or R 11 and R 12 , together form, independently, a fused 4- to 7-member cyclic group, wherein said cyclic group is cycloalkyl, cycloheteroalkyl, aryl, or heteroaryl, and wherein said cyclic group is optionally substituted by one or more substituents X; each R is, independently, H, C 1 –C 20 alkyl, C 2 –C 20 alkenyl, C 2 –C 20 alkynyl, C 1 –C 20 heteroalkyl, C 5 –C 40 aryl, C 5 –C 40 heteroaryl, aralkyl; wherein R is optionally substituted by one or more substituents X; each X is, independently, H, F, Cl, Br, I, R′, OR′, N(R′) 2 , SR′, C(O)R′, C(O)OR′, C(O)N(R′) 2 , CN, NO 2 , SO 2 , SOR′, SO 2 R′, or SO 3 R′; each R′ is, independently, H, C 1 –C 20 alkyl, C 1 –C 20 perhaloalkyl, C 2 –C 20 alkenyl, C 2 –C 20 alkynyl, C 1 –C 20 heteroalkyl, C 5 –C 40 aryl, or C 5 –C 40 heteroaryl; and wherein at least one of R 1 , R 2 , R 3 , R 4 , R 9 , R 10 , R 11 , and R 12 is not H.