Patent ID: 8040053

Claim:
An organic light emitting device, comprising: an anode; a cathode; a first emissive layer disposed between the anode and the cathode, the first emissive layer comprising: a first non-emitting organic material, wherein the first non-emitting material is organometallic and is present in the first emissive layer in a concentration of at least 50 wt %; and a first emitting organic material; a second emissive layer disposed between the first emissive layer and the cathode, and in direct contact with the first emissive layer, the second emissive layer comprising: a second non-emitting organic material; and a second emitting organic material; a first non-emissive layer disposed between the first emissive layer and the anode, and in direct contact with the first emissive layer, the first non-emissive layer comprising the first non-emissive organic material.