Organic electroluminescent materials and devices

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

wherein A 5 , A 6 , A 7 , and A 8 comprise carbon or nitrogen;

wherein at least one of A 5 , A 6 , A 7 , and A 8 is nitrogen;

wherein ring B is bonded to ring A through a C—C bond;

wherein R 1 , R 2 and R 6 independently represent from mono-substitution to the possible maximum number of substitution, or no substitution;

wherein any adjacent substitutions in R 1 , R 2 , R 3 , and R 4 are optionally linked together to form a ring;

wherein X is a neutral donor;

wherein

is a monoanionic bidentate ligand;

wherein R 1 , R 2 , R 3 , R 4 , and R 6 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 n is an integer from 1 to 3.

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

3. The compound of claim 1 , wherein X is selected from the group consisting of N, P, and C.

4. The compound of claim 1 , wherein only one of A 5 to A 8 is nitrogen.

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

wherein the wave line indicates the bond to ring A, and the dashed line represents the bond to Ir; and

wherein R is selected from the group consisting of hydrogen, deuterium, alkyl, cycloalkyl, heteroalkyl, arylalkyl, silyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, and combinations thereof.

6. The compound of claim 1 , wherein R 3 , and R 4 are alkyl.

7. The compound of claim 1 , wherein R 3 , and R 4 are linked together to form a ring.

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

9. The compound of claim 1 , wherein

is selected from the group consisting of:

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

wherein R a , R b , and R c 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 , and R c are optionally joined to form a fused ring or form a multidentate ligand.

10. The compound of claim 1 , wherein

is selected from the group consisting of:

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

wherein R 5 is 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.

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

13. The compound of claim 12 , wherein the compound is selected from Compound 1 through Compound 66,384, wherein each compound x has the formula Ir(L Ak )(L Bj ) 2 , wherein x=461j+k−461, k is an integer from 1 to 461, and j is an integer from 1 to 144; and wherein L B is selected from the group consisting of:

14. 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 A 5 , A 6 , A 7 , and A 8 comprise carbon or nitrogen;

wherein at least one of A 5 , A 6 , A 7 , and A 8 is nitrogen;

wherein ring B is bonded to ring A through a C—C bond;

wherein R 1 , R 2 and R 6 independently represent from mono-substitution to the possible maximum number of substitution, or no substitution;

wherein any adjacent substitutions in R 1 , R 2 , R 3 , and R 4 are optionally linked together to form a ring;

wherein X is a neutral donor;

wherein

is a monoanionic bidentate ligand;

wherein R 1 , R 2 , R 3 , R 4 , and R 6 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 n is an integer from 1 to 3.

15. The first device of claim 14 , wherein the organic layer is an emissive layer and the compound is an emissive dopant.

16. The first device of claim 14 , wherein the organic layer further comprises a host, wherein the host comprises a triphenylene containing benzo-fused thiophene or benzo-fused furan;

wherein any substituent in the host is an unfused substituent independently selected from the group consisting of C n H 2n+1 , OC n H 2n+1 , OAr 1 , N(C n H 2n+1 ) 2 , N(Ar 1 )(Ar 2 ), CH═CH—C n H 2n+1 , C≡CC n H 2n+1 , Ar 1 , Ar 1 —Ar 2 , and C n H 2n —Ar 1 ;

wherein n is from 1 to 10; and

wherein Ar 1 and Ar 2 are independently selected from the group consisting of benzene, biphenyl, naphthalene, triphenylene, carbazole, and heteroaromatic analogs thereof.

17. The first device of claim 14 , wherein the organic layer further comprises a host, wherein host comprises at least one chemical group selected from the group consisting of triphenylene, carbazole, dibenzothiophene, dibenzofuran, dibenzoselenophene, azatriphenylene, azacarbazole, aza-dibenzothiophene, aza-dibenzofuran, and aza-dibenzoselenophene.

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

wherein A 5 , A 6 , A 7 , and A 8 comprise carbon or nitrogen;

wherein at least one of A 5 , A 6 , A 7 , and A 8 is nitrogen;

wherein ring B is bonded to ring A through a C—C bond;

wherein R 1 , R 2 , and R 6 independently represent from mono-substitution to the possible maximum number of substitution, or no substitution;

wherein any adjacent substitutions in R 1 , R 2 , R 3 , and R 4 are optionally linked together to form a ring;

wherein X is a neutral donor;

wherein

is a monoanionic bidentate ligand;

wherein R 1 , R 2 , R 3 , R 4 , and R 6 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 n is an integer from 1 to 3.