Patent ID: 7288330

Claim:
A white light-emitting OLED device having an anode and a cathode, comprising: a) a first light-emitting layer provided over the anode and containing a first host material and a first light-emitting material, wherein the first host material is a mixture of one or more mono-anthracene derivatives and one or more aromatic amine derivatives, wherein the mono-anthracene derivative(s) being provided in a volume fraction range of 5% to 50% relative to the total host volume, and the aromatic amine derivative(s) being provided in a volume fraction range of 50% to 95% relative to the total host volume, and wherein the first light-emitting material has a peak emission in the yellow to red portion of the spectrum; and b) a second light-emitting layer provided over or under the first light-emitting layer, wherein the second light-emitting layer has a peak emission in the blue to cyan portion of the spectrum, whereby white light is produced by the OLED device.