Patent ID: 7368178

Claim:
An organic light-emitting device, comprising: a) a substrate; b) an anode and a cathode disposed over the substrate; c) a luminescent layer disposed between the anode and the cathode wherein the luminescent layer includes a host and at least one dopant; d) the host of the luminescent layer being selected to include a solid organic material comprising a mixture of at least two components wherein: i) the first component of the mixture contains a non-emissive aminoanthracene compound of the formula: wherein: R 1 to R 9 are individually hydrogen, fluoro, halogen, hydroxy, nitro, cyano, unbranched alkyl or substituted unbranched alkyl of from 1 to 24 carbon atoms, branched alkyl or substituted branched alkyl of from 1 to 24 carbon atoms, cyclic alkyl or substituted cyclic alkyl of from 1 to 24 carbon atoms, aryl or substituted aryl of from 5 to 40 carbon atoms, heterocyclic or substituted heterocyclic, alkenyl or substituted alkenyl, alkoxy or substituted alkoxy, aryloxy or substituted aryloxy, aromatic hydrocarbon or substituted aromatic hydrocarbon; Ar 1 and Ar 2 are individually aryl or substituted aryl of from 5 to 40 carbon atom; and ii) the second component of the mixture contains an organic compound having a dipole moment larger than that of the first component; and e) the dopant of the luminescent layer having a bandgap smaller than that of both the first and second components of the host and providing emission centers wherein the dopant produces blue, blue-green, green, green-yellow, or yellow light.