Patent ID: 7252893

Claim:
A white light-emitting OLED device including spaced anode and cathode, and having blue light-emitting and yellow, orange, or red light-emitting layers, the blue light-emitting layer including a) a monoanthracene derivative of Formula (I) as a host material and a cohost material 4,4′-bis[N-(1-naphthyl)-N-phenylamino]biphenyl (NPB) that is in a range of 4-10% by volume of both host materials wherein: R 1 -R 8 are H; R 9 is not the same as R 10 ; R 9 is a naphthyl group having no fused rings with aliphatic carbon ring members; and R 10 is a biphenyl group having no fused rings with aliphatic carbon ring members; and provided that R 9 and R 10 are free of amines and sulfur compounds; and b) a blue light-emitting dopant, wherein the blue-emitting dopant is from 0.25 to 5% by volume of the host materials.