Organic materials for OLEDs

1. A compound having the formula G 1 -L-G 2 , Formula I;

wherein G 1 has the structure:

wherein X is selected from the group consisting of O, S, and Se;

wherein each of X 1 , X 2 , X 3 , X 4 , X 5 , X 6 , X 7 , and X 8 is carbon or nitrogen;

wherein at least one of X 1 , X 2 , X 3 , X 4 , X 5 , X 6 , X 7 , and X 8 is nitrogen;

wherein at least one of X 1 , X 2 , X 3 , and X 4 is a carbon and bonded to L;

wherein R 1 , R 2 , R 3 , and R 4 independently represent mono substitution up to the maximum possible substitutions or no substitution;

wherein R 1 , R 2 , R 3 , and R 4 are each independently selected from the group consisting of hydrogen, deuterium, halide, alkyl, cycloalkyl, heteroalkyl, arylalkyl, alkoxy, aryloxy, amino, silyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carbonyl, carboxylic acids, ester, nitrile, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, and combinations thereof;

wherein R 1 and R 2 substitutions are optionally joined to form a fused ring;

wherein G 2 is selected from the group consisting of

wherein when G 2 is

R 3 and R 4 substitutions are optionally joined to form a fused ring;

wherein G 2 bonds to L at a carbon atom of G 2 ; and

wherein L is selected from the group consisting of benzene, biphenyl, terphenyl, naphthalene, triphenylene, dibenzofuran, dibenzothiophene, dibenzoselenophene, fluorene, pyridine, pyrimidine, pyridazine, pyrazine, quinoline, quinoxaline, naphthyridine, and combinations thereof; wherein L is optionally further unfused substituted with one or more groups selected from hydrogen, deuterium, alkyl, cycloalkyl, aralkyl, alkoxy, aryloxy, amino, silyl, aryl, heteroaryl, and combinations thereof.

2. The compound of claim 1 , wherein X is O or S.

3. The compound of claim 1 , wherein only one of X 1 , X 2 , X 3 , X 4 , X 5 , X 6 , X 7 , and X 8 is nitrogen.

4. The compound of claim 1 , wherein only two of X 1 , X 2 , X 3 , X 4 , X 5 , X 6 , X 7 , and X 8 are nitrogen.

5. The compound of claim 1 , wherein only two of X 1 , X 2 , X 3 , X 4 , X 5 , X 6 , X 7 , and X 8 are nitrogen and the two nitrogen atoms are on the same ring.

6. The compound of claim 1 , wherein only two of X 1 , X 2 , X 3 , and X 4 are nitrogen and X 5 , X 6 , X 7 , and X 8 are carbon items.

7. The compound of claim 1 , wherein G 1 is selected from the group consisting of:

8. The compound of claim 1 , wherein L is selected from the group consisting of:

9. The compound of claim 1 , wherein G 1 is selected from the group consisting of:

10. The compound of claim 1 , wherein L is selected from the group consisting of:

11. A device comprising one or more organic light emitting devices, wherein at least one of the one or more organic light emitting devices comprising:

an anode;

a cathode; and

an organic layer, disposed between the anode and the cathode, comprising a compound having the formula G 1 -L-G 2 , Formula I,

wherein G 1 has the structure:

wherein X is selected from the group consisting of O, S, and Se;

wherein each of X 1 , X 2 , X 3 , X 4 , X 5 , X 6 , X 7 , X 8 , is carbon or nitrogen;

wherein at least two of X 1 , X 2 , X 3 , X 4 , X 5 , X 6 , X 7 , and X 8 are nitrogen;

wherein at least one of X 1 , X 2 , X 3 , and X 4 is a carbon and bonded to L;

wherein R 1 , R 2 , R 3 , and R 4 independently represent mono substitution up to the maximum possible substitutions or no substitution;

wherein R 1 , R 2 , R 3 , and R 4 are each independently selected from the group consisting of hydrogen, deuterium, halide, alkyl, cycloalkyl, heteroalkyl, arylalkyl, alkoxy, aryloxy, amino, silyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carbonyl, carboxylic acids, ester, nitrile, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, and combinations thereof;

wherein R 1 and R 2 substitutions are optionally joined to form a fused ring;

wherein G 2 is selected from the group consisting of

wherein when G 2 is

R 3 and R 4 substitutions are optionally joined to form a fused ring;

wherein G 2 bonds to L at a carbon atom of G 2 ; and

wherein L is selected from the group consisting of benzene, biphenyl, terphenyl, naphthalene, triphenylene, dibenzofuran, dibenzothiophene, dibenzoselenophene, fluorene, pyridine, pyrimidine, pyridazine, pyrazine, quinoline, quinoxaline, naphthyridine, and combinations thereof; wherein L is optionally further unfused substituted with one or more groups selected from hydrogen, deuterium, alkyl, cycloalkyl, aralkyl, alkoxy, aryloxy, amino, silyl, aryl, heteroaryl, and combinations thereof.

12. The device of claim 11 , wherein the organic layer is an emissive layer and the compound of Formula I is a host.

13. The device of claim 11 , wherein the organic layer further comprises a phosphorescent emissive dopant that is a transition metal complex having at least one ligand or part of the ligand if the ligand is more than bidentate selected from the group consisting of:

wherein R a , R b , R c , and R d may represent mono, di, tri, or tetra substitution, or no substitution;

wherein R a , R b , R c , and R d are independently selected from the group consisting of hydrogen, deuterium, halide, alkyl, cycloalkyl, heteroalkyl, arylalkyl, alkoxy, aryloxy, amino, silyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carbonyl, carboxylic acids, ester, nitrile, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, and combinations thereof; and wherein two adjacent substituents of R a , R b , R c , and R d are optionally joined to form a fused ring or form a multidentate ligand.

14. The device of claim 11 , wherein the device is selected from the group consisting of a consumer product, an electronic component module, an organic light-emitting device, and a lighting panel.

15. The device of claim 11 , wherein the organic layer is a blocking layer and the compound is a blocking material in the organic layer.

16. The device of claim 11 , wherein the organic layer is an electron transport layer and the compound is an electron transporting material in the organic layer.

17. A formulation comprising a compound having the formula, G 1 -L-G 2 , Formula I;

wherein G 1 has the structure:

wherein X is selected from the group consisting of O, S, and Se;

wherein each of X 1 , X 2 , X 3 , X 4 , X 5 , X 6 , X 7 , X 8 , is carbon or nitrogen;

wherein at least one of X 1 , X 2 , X 3 , X 4 , X 5 , X 6 , X 7 , and X 8 is nitrogen;

wherein at least one of X 1 , X 2 , X 3 , and X 4 is a carbon and bonded to L;

wherein R 1 , R 2 , R 3 , and R 4 independently represent mono substitution up to the maximum possible substitutions or no substitution;

wherein R 1 , R 2 , R 3 , and R 4 are each independently selected from the group consisting of hydrogen, deuterium, halide, alkyl, cycloalkyl, heteroalkyl, arylalkyl, alkoxy, aryloxy, amino, silyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carbonyl, carboxylic acids, ester, nitrile, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, and combinations thereof;

wherein R 1 and R 2 substitutions are optionally joined to form a fused ring;

wherein G 2 is selected from the group consisting of

wherein when G 2 is

R 3 and R 4 substitutions are optionally joined to form a fused ring;

wherein G 2 bonds to L at a carbon atom of G 2 ; and

wherein L is selected from the group consisting of benzene, biphenyl, terphenyl, naphthalene, triphenylene, dibenzofuran, dibenzothiophene, dibenzoselenophene, fluorene, pyridine, pyrimidine, pyridazine, pyrazine, quinoline, quinoxaline, naphthyridine, and combinations thereof; wherein L is optionally further unfused substituted with one or more groups selected from hydrogen, deuterium, alkyl, cycloalkyl, aralkyl, alkoxy, aryloxy, amino, silyl, aryl, heteroaryl, and combinations thereof.

18. The compound of the claim 1 , wherein G 2 is selected from the group consisting of:

19. A compound of claim 1 , wherein the compound is selected from a group consisting of: