Electroluminescent device containing borondiketonate emitter

1. An OLED device comprising a light-emitting layer containing a hydrocarbon host material and a light-emitting material of Formula (1):

wherein:

each Ar represents an independently selected aromatic group;

each R 1 represents an independently selected alkyl group or aromatic group;

n is 1 or 2;

Z a represents the atoms necessary to form an aromatic ring group;

R represents hydrogen or a substituent group;

Z represents hydrogen or a substituent group; and

L 1 and L 2 represent independently selected substituent groups; provided that any two adjacent substituents of any of the above groups may join to form a ring.

2. The device of claim 1 wherein an R 1 represents an aromatic group.

3. The device of claim 1 wherein n is 1.

4. The device of claim 1 wherein the light-emitting material is represented by Formula (2):

wherein:

each Ar represents an independently selected aromatic group;

each R 1 , R 2 , and R 3 , represents an independently selected alkyl group or aromatic group;

n is 1 or 2;

m is 0, 1, or 2;

Z a and Z b represent the atoms necessary to form independently selected aromatic ring groups;

R represents hydrogen or a substituent group; and

L 1 and L 2 represent independently selected substituents; provided that any two adjacent substituents of any of the above groups may join to form a ring.

5. The device of claim 4 wherein R 1 , R 2 , and R 3 represent independently selected aryl groups.

6. The device of claim 4 wherein n is 1 and m is 0 or 1.

7. The device of claim 4 wherein R represents hydrogen.

8. The device of claim 4 wherein Z a and Z b represent the atoms necessary to form independently selected benzene ring groups.

9. The device of claim 4 wherein L 1 and L 2 represent fluoro substituents.

10. The device of claim 1 wherein the light-emitting material is represented by Formula (3),

wherein:

each Ar 1 and each Ar 2 represents an independently selected aromatic group;

R represents hydrogen or a substituent group;

p is 0 or 1;

each r represents a substituent group;

s is 0-4;

t is 0-5;

L 1 and L 2 represent independently selected substituents; provided that any two adjacent substituents of any of the above groups may join to form a ring.

11. The device of claim 10 wherein s and t are 0, and L 1 and L 2 represent fluoro.

12. The device of claim 1 wherein the material of Formula (1) is present at a level of 0.1 to 15% by volume of the layer.

13. The device of claim 1 wherein the material of Formula (1) is present at a level 0.5 to 5% by volume of the layer.

14. The device of claim 1 wherein the hydrocarbon host comprises an aromatic fused ring group.

15. The device of claim 1 wherein the hydrocarbon host is represented by Formula (4),

wherein:

W 1 -W 10 independently represent hydrogen or an independently selected substituent, provided that two substituents may join to form a ring.

16. The device of claim 15 wherein W 9 and W 10 represent an independently selected naphthyl group, biphenyl group or anthracenyl group and W 1 -W 8 represent hydrogen.

17. The device of claim 1 wherein the hydrocarbon host comprises at least 40% of the layer by volume.

18. The device of claim 1 wherein a second light-emitting layer is present comprising a host material and a light-emitting material.

19. The device of claim 18 wherein the host material in the second light-emitting layer is a hydrocarbon.

20. The device of claim 1 wherein white light is produced either directly or by using filters.