Selecting white point for OLED devices

1. 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.

2. The OLED device of claim 1 wherein the blue light emitting material is BEP

and the yellow-orange light emitting material is one or more of the following yellow-orange dopants: 5,6,11,12-tetraphenylnaphthacene (Rubrene); 6,11-diphenyl-5,12-bis(4-(6-methyl-benzothiazol-2-yl)phenyl)naphthacene (DBzR); 5,6,11,12-tetra(2-naphthyl)-naphthacene (NR); Formula L49; or Formula L50; the formulas of which are shown below:

3. An OLED device with a blue light-emitting material and a yellow-orange light-emitting material which combine to produce white light, and color filters which receive white light and respectively produce red, green, and blue light comprising:

a) 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;

b) 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) selecting the concentration of the blue light-emitting material or the yellow-orange light-emitting material, or both, so 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;

d) providing the red, green, and blue filters;

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; and

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

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.

4. The OLED according to claim 3 wherein the blue light emitting material is BEP

and the yellow-orange light emitting material is one or more of the following yellow-orange dopants: 5,6,11,12-tetraphenylnaphthacene (Rubrene); 6,11-diphenyl-5,12-bis(4-(6-methyl-benzothiazol-2-yl)phenyl)naphthacene (DBzR), 5,6,11,12-tetra(2-naphthyl)-naphthacene (NR), Formula L49, or Formula L50, the formulas of which are shown below:

5. The OLED device of claim 3 wherein the filters leave an unfiltered portion so that the OLED device also produces white light pixels.

6. The OLED device according to claim 5 wherein the blue light emitting material is BEP

and the yellow-orange light emitting material is one or more of the following yellow-orange dopants: 5,6,11,12-tetraphenylnaphthacene (Rubrene); 6,11-diphenyl-5,12-bis(4-(6-methyl-benzothiazol-2-yl)phenyl)naphthacene (DBzR), 5,6,11,12-tetra(2-naphthyl)-naphthacene (NR), Formula L49, or Formula L50, the formulas of which are shown below: