Organic electroluminescent materials and devices

1. A compound comprising a structure of Formula I:

wherein M is a metal with an atomic number of at least 40;

wherein R A , R B , and R C are each independently 5 or 6 membered aryl or heteroaryl rings;

wherein R 1 , R 2 , and R 3 each independently represent no substitutions or up to the maximum available substitutions;

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, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphine, and combinations thereof;

wherein A 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, phosphine, and combinations thereof;

wherein A is optionally bonded to R A or R C to form a fused ring;

wherein X 1 is B, CR 1 , N, O, S or Se;

wherein X 2 -X 7 are independently B, C or N; and

wherein Y 1 -Y 2 are independently C or N.

2. The compound of claim 1 , wherein M is Ir or Pt.

3. The compound of claim 1 , wherein A is aryl or heteroaryl.

4. The compound of claim 1 , wherein A is selected from the group consisting of phenyl, carbazole, azacarbazole, dibenzofuran, dibenzothiophene, dibenzoselenophene, azadibenzofuran, azadibenzothiophene, azadibenzoselenophene, triphenylene, azatriphenylene, and combinations thereof;

wherein A is optionally further substituted by one or more substituent A′;

wherein A′ 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, phosphine, a substituent of Formula I, and combinations thereof; and

wherein A′ is optionally bonded to R A or R C to form a fused ring.

5. The compound of claim 4 , wherein the compound is selected from the group consisting of:

6. The compound of claim 4 , wherein the compound is selected from the group consisting of:

7. The compound of claim 1 , wherein X 1 is C or N, A is aryl or heteroaryl, and A is connected to X 1 to form a fused ring.

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

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

10. The compound of claim 1 , wherein R A is an aromatic ring.

11. The compound of claim 1 , wherein R B is an aromatic ring or a hetero-aromatic ring comprising one nitrogen atom.

12. The compound of claim 1 , wherein R C is an aromatic ring or a hetero-aromatic ring comprising one or two nitrogen atoms.

13. The compound of claim 1 , wherein one of Y 1 and Y 2 is N, and wherein the other one of Y 1 and Y 2 is C.

14. A 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 structure of Formula I:

wherein M is a metal with an atomic number of at least 40;

wherein R A , R B , and R C are each independently 5 or 6 membered aryl or heteroaryl rings;

wherein R 1 , R 2 , and R 3 each independently represent no substitutions or up to the maximum available substitutions;

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, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphine, and combinations thereof;

wherein A 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, phosphine, and combinations thereof;

wherein A is optionally bonded to R A or R C to form a fused ring;

wherein X 1 is B, CR 1 , N, O, S or Se;

wherein X 2 -X 7 are independently B, C or N; and

wherein Y 1 -Y 2 are independently C or N.

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

16. The first organic light emitting device of claim 14 , wherein the organic layer is an emissive layer and the compound is an emissive dopant or a non-emissive dopant.

17. The first organic light emitting 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.

18. The first organic light emitting device of claim 14 , 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, azatriphenylene, azacarbazole, aza-dibenzothiophene, aza-dibenzofuran, and aza-dibenzoselenophene.

19. The first organic light emitting device of claim 14 , wherein the organic layer further comprises a host and the host is selected from the group consisting of:

and combinations thereof.

20. A formulation comprising a compound comprising a structure of Formula I:

wherein M is a metal with an atomic number of at least 40;

wherein R A , R B , and R C are each independently 5 or 6 membered aryl or heteroaryl rings;

wherein R 1 , R 2 , and R 3 each independently represent no substitutions or up to the maximum available substitutions;

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, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphine, and combinations thereof;

wherein A 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, phosphine, a substituent of Formula I, and combinations thereof;

wherein A is optionally bonded to R A or R C to form a fused ring;

wherein X 1 is B, CR 1 , N, O, S or Se;

wherein X 2 -X 7 are independently B, C or N; and

wherein Y 1 -Y 2 are independently C or N.