OLED device with substituted acridone compounds

1. An OLED device comprising a cathode, an anode, and having therebetween a layer containing an acridone compound wherein the acridone compound is according to the following formula:

wherein:

R 1 and R 2 are substituents;

x and y are independently 0 to 4;

L is a linking group consisting of an unbroken chain of 6 to 36 aromatic, olefinic or acetylenic carbon atoms; and

Ar 1 and Ar 2 are independently aromatic groups of 6 to 30 carbon atoms or are connected together to form a carbazole group.

2. The OLED device of claim 1 wherein the layer containing the acridone compound is a light-emitting layer including a light-emitting dopant.

3. The OLED device of claim 2 wherein the light-emitting dopant is fluorescent.

4. The OLED device of claim 3 wherein the fluorescent light-emitting dopant is a bis(azinyl)amine boron compound.

5. The OLED device of claim 2 wherein the light-emitting dopant is phosphorescent.

6. The OLED device of claim 5 wherein the phosphorescent dopant is an iridium complex.

7. The OLED device of claim 1 including a light-emitting layer and where the layer containing the acridone compound is a hole-blocking layer located between the light-emitting layer and the cathode.

8. The OLED device of claim 1 wherein x and y are both 0 and L is phenyl or biphenyl.

9. The OLED device of claim 8 wherein Ar 1 and Ar 2 are phenyl groups.

10. The OLED device of claim 8 wherein Ar 1 and Ar 2 are joined together to form a carbazole group.

11. A method of emitting light comprising applying an electric potential across the device of claim 1 .

12. A display comprising the device of claim 1 .