Patent ID: 7118810

Claim:
An electroluminescent device comprising: a substrate; a first electrode deposited on the substrate; a hole-injecting layer positioned on the first electrode, the hole-injecting layer comprising a polymeric compound and a movable anion, the polymeric compound having at least one block of [O—(CH 2 ) x ] y units and at least one non-movable cationic moiety, wherein x is an integer equal to or greater than two, wherein y is an integer equal to or greater than one; an emissive layer comprising an organic electroluminescent material, positioned on the hole-injecting layer; an electron-injecting layer positioned on the emissive layer, the electron-injecting layer comprising a polymeric compound and a movable cation, the polymeric compound having at least one block of [O—(CH 2 ) x′ ] y′ units and at least one non-movable anionic moiety, wherein x′ is an integer equal to or greater than two, wherein y′ is an integer equal to or greater than one; and a second electrode deposited on the electron-injecting layer.