Organic electroluminescent materials and devices

1. A composition comprising:

a non-polymeric first compound;

wherein the first compound is a metal coordination complex having a metal-carbon bond;

wherein the first compound is capable of functioning as a phosphorescent emitter in an organic light emitting device at room temperature;

wherein the first compound comprises a chemical group having the formula:

wherein X 1 to X 12 are each a carbon atom or a nitrogen atom;

wherein R A , R B , and R C each independently represents none to maximum available number of substituents;

wherein R A , R B , and R C are each independently selected from the group consisting of hydrogen, deuterium, halide, alkyl, cycloalkyl, arylalkyl, silyl, alkenyl, cycloalkenyl, heteroalkenyl, aryl, heteroaryl, acyl, carbonyl, carboxylic acids, ester, nitrile, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, and combinations thereof;

wherein at least one of X 1 to X 12 , R A , R B , and R C is bonded to the metal,

wherein any unlabeled atoms depicted with bonds in Formula I are carbon, and any unlabeled substituents implicitly attached to Formula I are hydrogen; and

wherein any hydrogen may be replaced with a deuterium.

2. The composition of claim 1 , wherein X 1 to X 12 are carbon.

3. The composition of claim 1 , wherein at least one of X 1 to X 12 is a nitrogen.

4. The composition of claim 1 , wherein the maximum number of nitrogen atoms in X 1 to X 12 is three.

5. The composition of claim 1 , wherein the first compound has at least one aromatic ring and at least one substituent R;

wherein each of the at least one R is directly bonded to one of the aromatic rings; and

wherein each of the at least one R is a chemical group having Formula I.

6. The composition of claim 1 , wherein at least one of X 1 to X 12 is directly bonded to the metal.

7. The composition of claim 1 , wherein the chemical group having Formula I is a structure selected from the group consisting of:

8. The composition of claim 1 , wherein the metal is selected from the group consisting of Ir, Rh, Re, Ru, Os, Pt, Au, and Cu.

9. The composition of claim 1 , wherein the first compound has the formula of M(L 1 ) x (L 2 ) y (L 3 ) z ;

wherein L 1 , L 2 , and L 3 can be the same or different;

wherein x is 1, 2, or 3;

wherein y is 0, 1, or 2;

wherein z is 0, 1, or 2;

wherein x+y+z is the oxidation state of the metal M;

wherein L 1 , L 2 , and L 3 are each independently selected from the group consisting of:

wherein X 1 to X 17 are each 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′, R″, 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, acyl, carbonyl, carboxylic acids, ester, nitrile, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, and combinations thereof; and

wherein any two adjacent substituents of R a , R b , R c , and R d are optionally fused or joined to form a ring or form a multidentate ligand; and

wherein (1) at least one of the R a , R b , R c , and R d includes at least one chemical group having Formula I, or (2) when R a , R b , R c , and R d are attached to a six-membered ring, at least one of the such R a , R b , R c , and R d join adjacent substituents and fuse into the six-membered ring attached thereto to form a chemical group having Formula I.

10. The composition of claim 9 , wherein the first compound has the formula of Ir(L 1 ) 2 (L 2 ).

11. The composition of claim 10 , wherein L 1 and L 2 are different and are each independently selected from the group consisting of:

12. The composition of claim 9 , wherein the structure of Formula I is selected from the group consisting of:

13. The composition of claim 9 , wherein at least one of L 1 , L 2 , and L 3 is selected from the group consisting of:

14. The composition of claim 13 , wherein the compound is selected from the group consisting of Compound 1 through Compound 89882; where Compound x having the formula

M(L Ai )(L Bj ) 2 ;

wherein x=300j+i−300, i is an integer from 1 to 182, and j is an integer from 1 to 300;

wherein L Bj has the following formula:

15. An organic light-emitting device (OLED) comprising:

an anode;

a cathode; and

an organic layer, disposed between the anode and the cathode, comprising a non-polymeric first compound;

wherein the first compound is a metal coordination complex having a metal-carbon bond;

wherein the first compound is capable of functioning as a phosphorescent emitter in an organic light emitting device at room temperature;

wherein the first compound comprises a chemical group having the formula:

wherein X 1 to X 12 are each a carbon atom or a nitrogen atom;

wherein R A , R B , and R C each independently represents none to maximum available number of substituents;

wherein R A , R B , and R C are each independently selected from the group consisting of hydrogen, deuterium, halide, alkyl, cycloalkyl, arylalkyl, silyl, alkenyl, cycloalkenyl, heteroalkenyl, aryl, heteroaryl, acyl, carbonyl, carboxylic acids, ester, nitrile, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, and combinations thereof;

wherein at least one of X 1 to X 12 , R A , R B , and R C is bonded to the metal,

wherein any unlabeled atoms depicted with bonds in Formula I are carbon, and any unlabeled substituents implicitly attached to Formula I are hydrogen; and

wherein any hydrogen may be replaced with a deuterium.

16. The OLED of claim 15 , wherein the OLED is incorporated into a device selected from the group consisting of a consumer product, an electronic component module, and a lighting panel.

17. The OLED of claim 15 , wherein the organic layer is an emissive layer and the compound is an emissive dopant or a non-emissive dopant.

18. The OLED of claim 15 , 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, dibenzothiophene, dibenzofuran, dibenzoselenophene, aza-triphenylene, azacarbazole, aza-dibenzothiophene, aza-dibenzofuran, and aza-dibenzoselenophene.

19. The OLED of claim 15 , wherein the organic layer further comprises a host wherein the host is selected from the group consisting of:

and combinations thereof.

20. A formulation comprising the composition according to claim 1 .