Combinatorial fabrication and study of doped-layer-thickness-dependent color evolution in bright small molecular organic light-emitting devices

The behavior of [N,N′-diphenyl-N,N′-bis(1-naphthylphenyl)-1,1′-biphenyl-4,4′-diamine (α-NPD)]/[5±0.6 wt % [(2-methyl-6-{2-[2,3,6,7-tetrahydro-1H,5H-benzo(i,j)quinolizin-9-yl] ethenyl}-4H-pyran-4-ylidene)propane-dinitrile (DCM2)-doped α-NPD]/[4,4′-bis(2,2′-diphenylvinyl)-1,1′-biphenyl] organic light-emitting devices is described. The color of the devices shifts from blue to red as the thickness of the doped layer increases from 0 to 35 A. The 2-A-thick doped layer device exhibited the highest brightness L∼120 Cd/m2 and external quantum efficiency ηext∼4.4% at a current density of 1 mA/cm2.

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