Patent ID: 7728517

Claim:
A stacked OLED comprising: a first electrode; a second electrode; a plurality of luminescent regions disposed between the first and second electrodes; and two or more intermediate electrodes, the intermediate electrodes being disposed between successive luminescent regions, wherein each intermediate electrode is a metal-organic mixed layer electrode comprising a first charge injecting layer, a second charge injecting layer, and a metal-organic mixed layer disposed between the first and second charge injecting layers, wherein the first and second charge injecting layers have different charge injecting functions and wherein the metal-organic mixed layer comprises a metal material comprising a metal selected from the group consisting of Sc, Y, Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, Mn, Tc, Ru, Os, Co, Rh, Ir, Ni, Pd, Pt, Cu, Ag, Au, Zn, Cd, Sn, Pb, Bi, Se, Te, Nd, and combinations thereof.