Organic light emitting devices having reduced pixel shrinkage

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 R1, R2, R3, R4, R9, R10, R11, and R12 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, NO2, SO2, SOR, SO2R, SO3R;
• and additionally, or alternatively, any one or more of R1 and R2, or R2 and R3, or R3 and R4, or R9 and R10, or R10 and R11, or R11 and R12, 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, C1–C20 alkyl, C2–C20 alkenyl, C2–C20 alkynyl, C1–C20 heteroalkyl, C5–C40 aryl, C5–C40 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, NO2, SO2, SOR′, SO2R′, or SO3R′;
• each R′ is, independently, H, C1–C20 alkyl, C1–C20 perhaloalkyl, C2–C20 alkenyl, C2–C20 alkynyl, C1–C20 heteroalkyl, C5–C40 aryl, or C5–C40 heteroaryl;
• and
• wherein at least one of R1, R2, R3, R4, R9, R10, R11, and R12 is not H.