Patent ID: 7517595

Claim:
An OLED device comprising a cathode, an anode, a light emitting layer, and on the cathode side of said emitting layer, a further layer, wherein the further layer is an electron-transporting layer containing a mixture of: a) a first compound that has the lowest LUMO value of the compounds in the layer, the amount being greater than 40% by volume and less than 100% by volume of the layer wherein the first compound is represented by formula V: wherein: R 1 , R 3 , R 4 , R 7 , R 9 , R 10 , represent hydrogen; R 2 and R 8 represent hydrogen or independently selected alkyl groups; R 5 , R 6 , R 11 , and R 12 represent independently selected aryl groups; and b) at least one second compound that is a low voltage electron transport material, exhibiting a higher LUMO value than the first compound, the total amount of said compound(s) being less than or equal to 60% by volume and more than 0% by volume of the layer wherein the second compound is represented by Formula I: wherein M represents Al; n is 3; and Z independently in each occurrence represents the atoms completing a quinoline group.