Patent ID: 8179035

Claim:
An OLED device for producing white light, comprising: a) an anode and a spaced cathode; b) first and second light-emitting layers, the first having a blue light-emitting material which has a first point on a chromaticity diagram within a first area defined by CIEx=0.10 to 0.20, CIEy=0.05 to 0.15, the second layer having a yellow-orange light-emitting material which has a second point on a chromaticity diagram within a second area defined by CIEx=0.42 to 0.57; CIEy=0.42 to 0.57 such that, when a line is drawn between the first point and the second point, it passes through a desired white area defined on a chromaticity diagram to be within CIEx=0.27 to 0.39, CIEy=0.27 to 0.39; c) the concentration of the selected first and second materials being such that the white light produced by the OLED device is at a third point substantially on the line in the chromaticity diagram within the desired white area; wherein the blue light emitting material includes perylene or derivatives thereof or a compound of the structure: wherein: A and A′ represent independent azine ring systems corresponding to 6-membered aromatic ring systems containing at least one nitrogen; (X a ) n and (X b ) m represent one or more independently selected substituents and include acyclic substituents or are joined to form a ring fused to A or A′; m and n are independently 0 to 4; Z a and Z b are independently selected substituents; 1, 2, 3, 4, 1′, 2′, 3′, and 4′ are independently selected as either carbon or nitrogen atoms; provided that X a , X b , Z a , and Z b , 1, 2, 3, 4, 1′, 2′, 3′, and 4′ are selected to provide blue luminescence; and the yellow-orange light emitting material includes a compound of the following structures: wherein A 1 -A 6 represent one or more substituents on each ring and where each substituent is individually selected from one of the following: Category 1: hydrogen, or alkyl of from 1 to 24 carbon atoms; Category 2: aryl or substituted aryl of from 5 to 20 carbon atoms; Category 3: hydrocarbon containing 4 to 24 carbon atoms, completing a fused aromatic ring or ring system; Category 4: heteroaryl or substituted heteroaryl of from 5 to 24 carbon atoms such as thiazolyl, furyl, thienyl, pyridyl, quinolinyl or other heterocyclic systems, which are bonded via a single bond, or complete a fused heteroaromatic ring system; Category 5: alkoxylamino, alkylamino, or arylamino of from 1 to 24 carbon atoms; or Category 6: fluoro, chloro, bromo or cyano.