Organic electroluminescent materials and devices

1. A compound having the formula Ir(L A ) n (L B ) 3−n , having the structure:

wherein R 1 and R 5 each independently represent mono, di, tri, or tetra-substitution, or no substitution;

wherein R 4 represents mono, or di-substitution, or no substitution;

wherein X 1 , X 2 , X 3 , and X 4 are each independently CR 2 or N;

wherein at least one of X 1 , X 2 , X 3 , and X 4 is N;

wherein any adjacent substituents of R 1 , R 2 , R 3 , R 4 , and R 5 are optionally linked together to form a ring;

wherein each R 1 , R 2 , R 3 , R 4 , and R 5 is 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, carboxylic acids, ester, nitrile, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, and combinations thereof; and

wherein n is either 1 or 2.

2. The compound of claim 1 , wherein n is 1.

3. The compound of claim 1 , wherein n is 2.

4. The compound of claim 1 , wherein the compound has the formula:

wherein R 6 represents mono, di, tri, or tetra-substitution, or no substitution;

wherein any adjacent substitutions of R 6 are optionally linked together to form a ring; and

wherein each R 6 is 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, carboxylic acids, ester, nitrile, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, and combinations thereof.

5. The compound of claim 4 , wherein only one of X 1 , X 2 , X 3 , and X 4 is N.

6. The compound of claim 5 , wherein X 2 is N.

7. The compound of claim 1 , wherein R 1 is selected from the group consisting of hydrogen, deuterium, alkyl, cycloalkyl, and combinations thereof.

8. The compound of claim 1 , wherein R 2 is selected from the group consisting of hydrogen, deuterium, halide, alkyl, cycloalkyl, nitrile, and combinations thereof.

9. The compound of claim 1 , wherein R 3 is alkyl or cycloalkyl.

10. The compound of claim 1 , wherein R 3 is aryl or substituted aryl.

11. The compound of claim 1 , wherein R 3 is selected from the group consisting of: ethyl, propyl, 1-methylethyl, butyl, 1-methylpropyl, 2-methylpropyl, pentyl, 1-methylbutyl, 2-methylbutyl, 3-methylbutyl, 1,1-dimethylpropyl, 1,2-dimethylpropyl, 2,2-dimethylpropyl, cyclopentyl, and cyclohexyl, wherein each group is optionally partially or fully deuterated.

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

wherein R 9 represents mono, di, tri, or tetra-substitution, or no substitution;

wherein each R 7 , R 8 , and R 9 is 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, carboxylic acids, ester, nitrile, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, and combinations thereof; and

wherein X is O or S.

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

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

15. The compound of claim 14 , wherein L A is selected from the group consisting of:

wherein n is 2; and

wherein the compound has a structure according to the formula Ir(L Ak ) 2 (L Bj ), wherein the compound is selected from the group consisting of Compound x, wherein x is an integer from 1 to 3300, wherein for each Compound x of formula Ir(L Ak ) 2 (L Bj ), k is an integer from 1 to 55, j is an integer from 1 to 60, and x=55j+k−55, wherein L A1 through L A55 and L B1 through L B60 are as defined above.

16. A first device comprising a first organic light emitting device, the first organic light emitting device comprising:

an anode;

a cathode; and

an organic layer, disposed between the anode and the cathode, comprising a compound having the formula Ir(L A ) n (L B ) 3−n , having the structure:

wherein R 1 and R 5 each independently represent mono, di, tri, or tetra-substitution, or no substitution;

wherein R 4 represents mono, or di-substitution, or no substitution;

wherein X 1 , X 2 , X 3 , and X 4 are each independently CR 2 or N;

wherein at least one of X 1 , X 2 , X 3 , and X 4 is N;

wherein any adjacent substituents of R 1 , R 2 , R 3 , R 4 , and R 5 are optionally linked together to form a ring;

wherein each R 1 , R 2 , R 3 , R 4 , and R 5 is 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, carboxylic acids, ester, nitrile, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, and combinations thereof; and

wherein n is either 1 or 2.

17. The first device of claim 16 , wherein the first device is selected from the group consisting of a consumer product, an electronic component module, an organic light-emitting device, and a lighting panel.

18. The first device of claim 16 , wherein the organic layer is an emissive layer and the compound is an emissive dopant or a non-emissive dopant.

19. The first device of claim 16 , wherein the organic layer further comprises a host, wherein the host comprises at least one chemical group selected from the group consisting of triphenylene, carbazole, dibenzothiphene, dibenzofuran, dibenzoselenophene, azatriphenylene, azacarbazole, aza-dibenzothiophene, aza-dibenzofuran, and aza-dibenzoselenophene.

20. A formulation comprising a compound having the formula Ir(L A ) n (L B ) 3−n , having the structure:

wherein R 1 and R 5 each independently represent mono, di, tri, or tetra-substitution, or no substitution;

wherein R 4 represents mono, or di-substitution, or no substitution;

wherein X 1 , X 2 , X 3 , and X 4 are each independently CR 2 or N;

wherein at least one of X 1 , X 2 , X 3 , and X 4 is N;

wherein any adjacent substituents of R 1 , R 2 , R 3 , R 4 , and R 5 are optionally linked together to form a ring;

wherein each R 1 , R 2 , R 3 , R 4 , and R 5 is 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, carboxylic acids, ester, nitrile, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, and combinations thereof; and

wherein n is either 1 or 2.