Patent ID: 8372526

Claim:
A device, comprising: an anode; a cathode; an intermediate connector disposed between the anode and the cathode, the intermediate connector comprising: a first metal having a work function lower than 4.0 eV; and a second metal having a work function lower than 5.0 eV; wherein the work function of the first metal is at least 0.5 eV less than the work function of the second metal; a first layer consisting essentially of the first metal, the first layer being in direct contact with the first sublayer of the second organic layer; and a second layer consisting essentially of the second metal, the second layer being in direct contact with the first layer, and disposed closer to the anode than the first layer; a first organic layer disposed between the anode and the intermediate connector, the first organic layer further comprising a first organic emissive material; a second organic layer disposed between the intermediate connector and the cathode, the second organic layer comprising a plurality of sublayers, including a first sublayer of the second organic layer and a second sublayer of the second organic layer; the first sublayer of the second organic layer being in direct contact with the intermediate connector, and comprising a material having the structure: wherein R 1 -R 6 are independently chosen from the group consisting of hydrogen, halo, nitrile (—CN), nitro (—NO 2 ), sulfonyl (—SO 2 R), sulfoxide (—SOR), sulfonamide (—SO 2 NR), sulfonate (—SO 3 R), trifluoromethyl (—CF 3 ), ester (—CO—OR), amide (—CO—NHR or —CO—NRR′), straight-chain or branched (substituted or unsubstituted) C 1 -C 12 alkoxy, straight-chain or branched (substituted or unsubstituted) C 1 -C 12 alkyl, aromatic or non-aromatic (substituted or unsubstituted) heterocyclic, substituted or unsubstituted aryl, mono- or di-(substituted or unsubstituted)aryl-amine, (substituted or unsubstituted)alkyl-(substituted or unsubstituted)aryl-amine, and substituted or unsubstituted electron withdrawing substituent groups, where R and R′ are independently selected from substituted or unsubstituted C 1 -C 60 alkyl, substituted or unsubstituted aryl, substituted or unsubstituted 5-7 membered heterocyclic, where substituted C 1 -C 60 alkyl, aryl and heterocyclic are optionally substituted with one or more of amine, amide, ether and ester groups, and where aryl groups includes phenyl, biphenyl, terphenyl, naphthyl, anthracenyl, tetracenyl, pentacenyl, perylenyl and coronenyl, which are singly or multiply substituted or unsubstituted; and the second sublayer of the second organic layer comprising a second organic emissive material; wherein the first layer is in direct contact with the first sublayer of the second organic layer.