Copper(I)-carbene complexes and organic electroluminescent devices

1. A first device comprising an organic light emitting device, further comprising:

an anode;

a cathode; and

an organic layer, disposed between the anode and the cathode, the organic layer comprising an emissive dopant and a first host material comprising a carbene ligand coordinated to a three coordinate copper atom, wherein the first host material has the formula:

wherein Cu is a monovalent copper atom;

wherein the carbene represented by X 1 —C*—X 2 is a monodentate ligand selected from the group consisting of

wherein z is 1, 2, 3, or 4;

wherein each of Y 1 and Y 2 form a bond with Cu;

wherein at least one of (i) to (x) is true:

(i) Y 1 -Y 2 is selected from the group consisting of:

(ii) Y 1 -Y 2 is selected from the group consisting of:

(iii) Y 1 is

and

Y 2 is a monodentate ligand selected from the group consisting of

(iv) Y 1 -Y 2 is selected from the group consisting of:

(v) Y 1 -Y 2 is selected from the group consisting of:

(vi) Y 1 -Y 2 is selected from the group consisting of:

(vii) Y 1 -Y 2 is selected from the group consisting of:

(viii) Y 1 -Y 2 is selected from the group consisting of:

(ix) Y 1 -Y 2 is selected from the group consisting of:

and

(x) Y 1 -Y 2 is selected from the group consisting of:

wherein, when present,

X is selected from the group consisting of NR, O, S, Se, CR 2 , and CO;

each R is independently selected from the group consisting of hydrogen, alkyl, alkoxy, amino, alkenyl, alkynyl, arylalkyl, heteroalkyl, aryl, and heteroaryl;

Y 3 and Y 4 are independently selected from the group consisting of hydrogen, alkyl, aryl, alkoxy, amino, alkenyl, alkynyl, arylalkyl, heteroalkyl, and heteroaryl;

Y 3 and Y 4 are optionally joined to form a cycle, which may be extended by fusion

n is 0, 1, or 2, and

m is 0, 1, or 2.

2. The device of claim 1 , wherein Y 1 -Y 2 is selected from the group consisting of:

3. The device of claim 1 , wherein Y 1 -Y 2 is selected from the group consisting of:

4. The device of claim 1 , wherein Y 1 is

and

Y 2 is a monodentate ligand selected from the group consisting of

5. The device of claim 1 , wherein Y 1 -Y 2 is selected from the group consisting of:

6. The device of claim 1 , wherein Y 1 -Y 2 is selected from the group consisting of:

7. The device of claim 1 , wherein Y 1 -Y 2 is selected from the group consisting of:

8. The device of claim 1 , wherein Y 1 -Y 2 is selected from the group consisting of:

9. The device of claim 1 , wherein Y 1 -Y 2 is selected from the group consisting of:

10. The device of claim 1 , wherein Y 1 -Y 2 is selected from the group consisting of:

11. The device of claim 1 , wherein Y 1 -Y 2 is selected from the group consisting of:

12. The device of claim 1 , wherein the first host meets one of option (iv) and option (v), and Y 3 and Y 4 are selected from the group consisting of the following (a) to (e):

wherein, in each of (a) to (e), the dashed lines represent bonds to the boron (B).

13. A first device comprising an organic light emitting device, further comprising:

an anode;

a cathode; and

an organic layer, disposed between the anode and the cathode, the organic layer comprising an emissive dopant and a first host material selected from the group consisting of:

14. The device of claim 13 , wherein the first host material is selected from the group consisting of:

15. The device of claim 13 , wherein the first host material is selected from the group consisting of:

16. The device of claim 13 , wherein the first host material is selected from the group consisting of:

17. The device of claim 13 , wherein the first host material is selected from the group consisting of: