Organic electroluminescent materials and devices

1. A compound having a structure of Formula I:

wherein each one of X 1 to 16 is independently CR X or N;

wherein each R X and R are independently selected from the group consisting of hydrogen, deuterium, halogen, 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, carbazole, azacarbazole, dibenzofuran, dibenzothiophene, dibenzoselenophene, azadibenzofuran, azadibenzothiophene, azadibenzoselenophene, triphenylene, azatriphenylene, and combinations thereof; and

wherein any adjacent R X can join to form fused or unfused rings.

2. The compound of claim 1 , having the structure of Formula I-a:

wherein each one of R 1 to R 16 independently represents a substituent selected from the group consisting of hydrogen, deuterium, halogen, 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, carbazole, azacarbazole, dibenzofuran, dibenzothiophene, dibenzoselenophene, azadibenzofuran, azadibenzothiophene, azadibenzoselenophene, triphenylene, azatriphenylene, and combinations thereof,

wherein any adjacent R 1 -R 16 can join to form a fused or unfused ring.

3. The compound of claim 2 , having the structure of Formula II:

wherein n is an integer ≥1;

wherein R t is

wherein all rings are optionally independently substituted by a substituent selected from the group consisting of deuterium, halogen, 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, carbazole, azacarbazole, dibenzofuran, dibenzothiophene, dibenzoselenophene, azadibenzofuran, azadibenzothiophene, azadibenzoselenophene, triphenylene, azatriphenylene, and combinations thereof; and

wherein any adjacent substituents can join to form fused or unfused rings.

4. The compound of claim 2 , wherein R is selected from the group consisting of aryl, heteroaryl, substituted aryl, and substituted heteroaryl.

5. The compound of claim 2 , wherein at least one of R 1 to R 16 is selected from the group consisting of aryl, heteroaryl, substituted aryl, and substituted heteroaryl.

6. The compound of claim 2 , wherein R is a triarylamine containing group.

7. The compound of claim 2 , wherein R is a group containing at least one electron withdrawing group of CN, F, C m F 2m+1 , Si m F 2m+1 , NCO, NCS, OCN, SCN, OC m F 2m+1 , or SC m F 2m+1 , wherein m≥1.

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

wherein R e is CN, F, C m F 2m+1 , Si m F 2m+1 , NCO, NCS, OCN, SCN, OC m F 2m+1 , or SC m F 2m+1 , and m≥1; and

wherein R t is

wherein all rings of R t are optionally independently substituted by a substituent selected from the group consisting of deuterium, halogen, 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, carbazole, azacarbazole, dibenzofuran, dibenzothiophene, dibenzoselenophene, azadibenzofuran, azadibenzothiophene, azadibenzoselenophene, triphenylene, azatriphenylene, and combinations thereof; and

wherein any adjacent substituents on R t can join to form fused or unfused rings.

9. The compound of claim 2 , wherein R is a group containing pyrimidine or triazene.

10. The compound of claim 1 , wherein at least one of X 1 to X 16 is N.

11. The compound of claim 1 , wherein at least two of adjacent R 1 -R 16 are fused into

wherein Z is CR′R″, NR′, O, S, or Se;

wherein R′ and R″ are independently selected from the group consisting of hydrogen, deuterium, halogen, 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, carbazole, azacarbazole, dibenzofuran, dibenzothiophene, dibenzoselenophene, azadibenzofuran, azadibenzothiophene, azadibenzoselenophene, triphenylene, azatriphenylene, and combinations thereof; and

wherein all of the rings are optionally substituted.

12. 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 having a structure of Formula I:

wherein each one of X 1 to X 16 is independently CR X or N;

wherein R X and R are independently selected from the group consisting of hydrogen, deuterium, halogen, 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, carbazole, azacarbazole, dibenzofuran, dibenzothiophene, dibenzoselenophene, azadibenzofuran, azadibenzothiophene, azadibenzoselenophene, triphenylene, azatriphenylene, and combinations thereof; and

wherein any adjacent R X can join to form fused or unfused rings.

13. The first organic light emitting device of claim 12 , wherein the organic layer is an emissive layer and the compound of Formula I is a host.

14. The first organic light emitting device of claim 12 , wherein the organic layer further comprises a phosphorescent emissive dopant wherein the phosphorescent emissive dopant is a transition metal complex having at least one ligand or part of the ligand if the ligand is more than bidentate, selected from the group consisting of:

wherein each X 1 to X 13 are 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, halogen, 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.

15. The first organic light emitting device of claim 12 , wherein the 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 12 , wherein the organic layer is an emissive layer and the compound having structure according to Formula I is a first light emitting compound.

17. The first organic light emitting device of claim 16 , wherein the first organic light emitting device emits a luminescent radiation at room temperature when a voltage is applied across the organic light emitting device; and

wherein the luminescent radiation comprises a delayed fluorescence process.

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

wherein all of the rings are optionally substituted, and

wherein R t is

wherein all rings of R t are optionally independently substituted by a substituent selected from the group consisting of deuterium, halogen, 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, carbazole, azacarbazole, dibenzofuran, dibenzothiophene, dibenzoselenophene, azadibenzofuran, azadibenzothiophene, azadibenzoselenophene, triphenylene, azatriphenylene, and combinations thereof; and

wherein any adjacent substituents on R t can join to form fused or unfused rings.

19. The compound of claim 10 , wherein the compound is selected from the group consisting of:

wherein all of the rings are optionally substituted.