Organic electroluminescent materials and devices

1. A compound comprising a ligand L A of Formula I:

wherein R 1 represents mono, or di-substitution, or no substitution;

wherein R 2 and R 3 each independently represent mono, di, tri, or tetra-substitution, or no substitution;

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

wherein R 1 , R 2 and R 3 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, carboxylic acid, ester, nitrile, and isonitrile;

wherein the ligand L A is coordinated to a metal M; and

wherein the ligand L A is optionally linked with other ligands to form a tridentate, tetradentate, pentadentate or hexadentate ligand.

2. The compound of claim 1 , wherein the compound has the formula M(L A ) m (L B ) n , having the structure:

wherein L B is a different ligand from L A ; and

wherein m is an integer from 1 to the maximum number of ligands that may be coordinated to the metal M; m+n is the maximum number of ligands that may be coordinated to the metal M.

3. The compound of claim 1 , wherein M is selected from the group consisting of Ir, Rh, Re, Ru, Os, Pt, Au, and Cu.

4. The compound of claim 1 , wherein M is Ir.

5. The compound of claim 1 , wherein the ligand L A has the structure of:

wherein R 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, and isonitrile.

6. The compound of claim 5 , wherein R is selected from the group consisting of alkyl, cycloalkyl, silyl, aryl, heteroaryl, and combinations thereof.

7. A formulation comprising a compound comprising a ligand L A of Formula I:

wherein R 1 represents mono, or di-substitution, or no substitution;

wherein R 2 and R 3 each independently represent mono, di, tri, or tetra-substitution, or no substitution;

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

wherein R 1 , R 2 and R 3 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, carboxylic acids, ester, nitrile, and isonitrile;

wherein the ligand L A is coordinated to a metal M; and

wherein the ligand L A is optionally linked with other ligands to form a tridentate, tetradentate, pentadentate or hexadentate ligand.

8. The compound of claim 1 , wherein the compound has the structure:

9. The compound of claim 5 , wherein the compound has the structure:

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

11. The compound of claim 10 , wherein the compound is selected from the group consisting of Compound 1 through Compound 316;

wherein each Compound x has the formula Ir(L Ai ) 3 ; and

wherein x=i; i is an integer from 1 to 316.

12. The compound of claim 1 , wherein the compound has the formula Ir(L A ) m (L B ) 3-m , having the structure:

wherein L B is a different ligand from L A ;

wherein m is 1 or 2;

wherein L B is selected from the group consisting of:

wherein each X 1 to X 13 is independently selected from the group consisting of carbon and nitrogen;

wherein X is selected from the group consisting of BR′, NR′, PR′, O, S, Se, C═O, S═O, SO 2 , CR′R″, SiR′R″, and GeR′R″;

wherein R′ and R″ are optionally fused or joined to form a ring;

wherein each R a , R b , R c , and R d may represent from mono substitution to the possible maximum number of substitution, or no substitution;

wherein R a , R b , R c , and R d 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, carboxylic acids, ester, nitrile, and isonitrile; and

wherein when R a , R b , R c , and R d represent at least di substitution, each of the two adjacent R a , two adjacent R b , two adjacent R c , and two adjacent R d are optionally fused or joined to form a ring or form a multidentate ligand.

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

14. The compound of claim 10 , wherein the compound is selected from the group consisting of Compound 317 through Compound 84,688;

wherein each Compound x has the formula Ir(L Ai )(L Bj ) 2 ;

wherein L Bi is selected from the group consisting of:

and wherein x=316j+i; i is an integer from 1 to 316, and j is an integer from 1 to 267.

15. The compound of claim 12 , wherein the L B is chosen such that the HOMO energy in Ir(L B ) 3 is deeper than that in Ir(L A ) 3 .

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

17. 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 comprising a ligand L A of Formula I:

wherein R 1 represents mono, or di-substitution, or no substitution;

wherein R 2 and R 3 each independently represent mono, di, tri, or tetra-substitution, or no substitution;

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

wherein R 1 , R 2 and R 3 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, and isonitrile;

wherein the ligand L A is coordinated to a metal M; and

wherein the ligand L A is optionally linked with other ligands to form a tridentate, tetradentate, pentadentate or hexadentate ligand.

18. The first device of claim 17 , 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.

19. The first device of claim 17 , wherein the organic layer is an emissive layer and the compound is an emissive dopant or a non-emissive dopant.

20. The first device of claim 17 , 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.

21. The compound of claim 1 , wherein the compound has a calculated triplet energy between 469 nm and 474 nm.