Patent ID: 7442447

Claim:
An organic light emitting device comprising an anode and a cathode, and an emissive layer between the anode and cathode, the device including a hole-blocking layer between the emissive layer and the cathode comprising a binaphthyl compound of the formula: wherein each Ar 1 and Ar 2 is independently a substituted or non-substituted polycyclic aromatic hydrocarbon or a substituted or non-substituted aromatic heterocycle, each X 1 and X 2 is independently a substituted or non-substituted aromatic hydrocarbon, each n 1 and n 2 is independently 0 or 1, each R 1 and R 2 is independently a hydroxyl group, a substituted or non-substituted alkyl group, or a substituted or non-substituted alkoxy group, wherein R 1 and R 2 can be bound to each other to form a ring structure wherein the ring structure can have substituent groups, and wherein the compound's binaphthyl framework can be independently substituted by a halogen, a hydroxyl group, or a substituted or non-substituted alkyl, alkenyl, alkoxy or alkoxycarbonyl group at any position except those occupied by (X 1 )n 1 Ar 1 , (X 2 )n 2 Ar 2 , R 1 and R 2 ; in which the hole-blocking layer between the emissive layer and the cathode comprises a compound of the formula: