Organic electroluminescent materials and devices

1. A compound of Formula I

wherein T 1 to T 20 are independently selected from the group consisting of CR T and N, and W 1 to W 6 are independently selected from the group consisting of CR W and N, wherein there is no more than two N in each 6-member aromatic ring;

each R T and each R W is independently selected from the group consisting of hydrogen, deuterium, halogen, alkyl, deuterated alkyl, cycloalkyl, deuterated cycloalkyl, heteroalkyl, deuterated heteroalkyl, arylalkyl, deuterated arylalkyl, alkoxy, aryloxy, amino, silyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, pyridine, pyrimidine, pyrazine, triazine, nitrile, isonitrile, benzonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, and combinations thereof; optionally, any two adjacent R T can join to form a ring, or an R W can join with a proximate R T to form a 5-membered ring,

with the proviso that when each of W 3 , W 4 , W 5 and W 6 are CR W , then at most one of these R W are aryl, heteroaryl or silyl.

2. The compound of claim 1 , wherein each R T and each R W is independently selected from the group consisting of hydrogen, deuterium, fluorine, alkyl, cycloalkyl, heteroalkyl, alkoxy, aryloxy, amino, silyl, alkenyl, cycloalkenyl, heteroalkenyl, aryl, heteroaryl, nitrile, isonitrile, sulfanyl, and combinations thereof.

3. The compound of claim 1 , wherein each R T and each R W is independently selected from the group consisting of hydrogen, deuterium, fluorine, alkyl, cycloalkyl, alkoxy, aryloxy, amino, silyl, aryl, heteroaryl, sulfanyl, and combinations thereof.

4. The compound of claim 2 , wherein at least one of R T and/or R W is a polycyclic group selected from the group consisting of:

wherein

X 1 to X 30 are independently selected from the group consisting of N and CR X , but no single 6-membered aromatic ring can have more than three N; wherein R x is defined as R T above;

Y is selected from the group consisting of C and Si;

Z 1 and Z 2 are independently selected from the group consisting of NR 1 , BR 1 , N, O, S, Se, CR 1 R 2 , SiR 1 R 2 , and GeR 1 R 2 ; wherein R 1 and R 2 are independently selected from the group consisting of deuterium, alkyl, aryl, heteroaryl, and combinations thereof; and

L 1 , L 2 , L 3 , and L 4 are independently selected from the group consisting of O, S, BR 1 , NR 1 , CR 1 R 2 and SiR 1 R 2 .

5. The compound of claim 1 , wherein each of T 1 to T 20 are C.

6. The compound of claim 1 , wherein T 1 to T 8 and T 11 to T 18 , collectively, include 2, 4, 6, or 8 N ring atoms; and/or T 9 , T 10 , T 19 , and T 20 , collectively include 2 N ring atoms.

7. The compound of claim 1 , wherein W 3 to W 6 , collectively include 2 N ring atoms.

8. The compound of claim 3 , having a structure of Formula II

wherein R 1 is representative of R W , or a polycyclic group selected from the group consisting of

wherein

X 1 to X 20 are independently selected from the group consisting of N and CR X , but no single 6-membered aromatic ring can have more than three N; wherein R X is defined as R T above;

Z 1 and Z 2 are independently selected from the group consisting of NR 1 , BR 1 , N, O, S, Se, CR 1 R 2 , SiR 1 R 2 , and GeR 1 R 2 ; and

wherein R 1 and R 2 are independently selected from the group consisting of deuterium, alkyl, aryl, heteroaryl, and combinations thereof.

9. The compound of claim 3 , having a structure of Formula III

wherein R 3 to R 6 , and R 3′ to R 6′ , are independently R T , and R 1 , R 1′ , R 2 , R 2′ are independently R W , or optionally, one to four of R 3 to R 6 , and R 3 to R 6′ , are a polycyclic group, and/or one of R 1 , R 1′ , R 2 , R 2′ is a polycyclic group, wherein the polycyclic group is selected from the group consisting of

wherein X 1 to X 20 are independently selected from the group consisting of N and CR X , but no single 6-membered aromatic ring can have more than three N; wherein R X is defined as R T above;

Z 1 and Z 2 are independently selected from the group consisting of NR 1 , BR 1 , N, O, S, Se, CR 1 R 2 , SiR 1 R 2 , and GeR 1 R 2 ; wherein R 1 and R 2 are independently selected from the group consisting of deuterium, alkyl, aryl, heteroaryl, and combinations thereof.

10. The compound of claim 1 , wherein each R T and each R W are independently selected from the group consisting of:

hydrogen;

alkyl selected from the group consisting of methyl, ethyl, propyl, i-propyl, t-butyl, and partially or fully deuterated analogs thereof;

aryl selected from the group consisting of phenyl, naphthyl, and partially or fully deuterated analogs of each thereof; each of which is optionally substituted at an ortho position;

heteroaryl selected from the group consisting of pyridyl, pyrazinyl, pyrimidyl, triazinyl, carbazoyl, dibenzofuran, dibenzothiophene, benzimidazole[2,1-b]benzothiazole, 5H-benzimidazo[1,2-a]benzimidazole, benzimidazo[2,1-b]benzoxazole, aza-carbazoyl, aza-dibenzofuran, aza-dibenzothiophene, aza-benzimidazole[2,1-b]benzothiazole, aza-5H-benzimidazo[1,2-a]benzimidazole and aza-benzimidazo[2,1-b]benzoxazole, and partially or fully deuterated analogs of each thereof; each of which is optionally substituted at an ortho position;

wherein substitution at the ortho position is a substituent selected from methyl, ethyl, propyl, i-propyl, or t-butyl, and partially or fully deuterated analogs of each thereof.

11. The compound of claim 9 , wherein R 1 to R 6 , and R 1′ to R 6′ , are independently selected from the group consisting of:

hydrogen;

alkyl selected from the group consisting of methyl, ethyl, propyl, i-propyl, t-butyl, and partially or fully deuterated analogs thereof;

aryl selected from the group consisting of phenyl, naphthyl, and partially or fully deuterated analogs of each thereof; each of which is optionally substituted at an ortho position;

heteroaryl selected from the group consisting of pyridyl, pyrazinyl, pyrimidyl, triazinyl, carbazoyl, dibenzofuran, dibenzothiophene, benzimidazole[2,1-b]benzothiazole, 5H-benzimidazo[1,2-a]benzimidazole, benzimidazo[2,1-b]benzoxazole, aza-carbazoyl, aza-dibenzofuran, aza-dibenzothiophene, aza-benzimidazole[2,1-b]benzothiazole, aza-5H-benzimidazo[1,2-a]benzimidazole and aza-benzimidazo[2,1-b]benzoxazole, and partially or fully deuterated analogs of each thereof; each of which is optionally substituted at an ortho position;

wherein substitution at the ortho position is a substituent selected from methyl, ethyl, propyl, i-propyl, or t-butyl, and partially or fully deuterated analogs of each thereof.

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

13. An organic light emitting device (OLED) comprising:

an anode; a cathode; an organic layer disposed between the anode and the cathode, the organic layer comprising a compound of Formula I

wherein T 1 to T 20 are independently selected from the group consisting of CR T and N, and W 1 to W 6 are independently selected from the group consisting of CR W and N, wherein there is no more than two N in each 6-member aromatic ring;

each R T and each R W is independently selected from the group consisting of hydrogen, deuterium, halogen, alkyl, deuterated alkyl, cycloalkyl, deuterated cycloalkyl, heteroalkyl, deuterated heteroalkyl, arylalkyl, deuterated arylalkyl, alkoxy, aryloxy, amino, silyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, pyridine, pyrimidine, pyrazine, triazine, nitrile, isonitrile, benzonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, and combinations thereof; optionally, any two adjacent R T can join to form a ring, or an R W can join with a proximate R T to form a 5-membered ring,

with the proviso that when each of W 3 , W 4 , W 5 and W 6 are CR W , then at most one of these R W are aryl, heteroaryl or silyl.

14. The OLED of claim 13 , wherein each R T and each R W is independently selected from the group consisting of hydrogen, deuterium, fluorine, alkyl, cycloalkyl, alkoxy, aryloxy, amino, silyl, aryl, heteroaryl, sulfanyl, and combinations thereof.

15. The OLED of claim 13 , wherein the organic layer further comprises a phosphorescent emissive dopant; wherein the 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 Y 1 to Y 13 are independently selected from the group consisting of carbon and nitrogen;

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

wherein R e and R f are optionally fused or joined to form a ring;

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

wherein each R a , R b , R c , R d , R e , and R f is 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.

16. The OLED of claim 13 , wherein the organic layer is a blocking layer and the compound of Formula I is a blocking material in the organic layer, or the organic layer is a transporting layer and the compound of Formula I is a transporting material in the organic layer.

17. A consumer product comprising an organic light emitting device (OLED) comprising:

an anode; a cathode; an organic layer disposed between the anode and the cathode, the organic layer comprising a compound of Formula I

wherein T 1 to T 20 are independently selected from the group consisting of CR T and N, and W 1 to W 6 are independently selected from the group consisting of CR W and N, wherein there is no more than two N in each 6-member aromatic ring;

each R T and each R W is independently selected from the group consisting of hydrogen, deuterium, halogen, alkyl, deuterated alkyl, cycloalkyl, deuterated cycloalkyl, heteroalkyl, deuterated heteroalkyl, arylalkyl, deuterated arylalkyl, alkoxy, aryloxy, amino, silyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, pyridine, pyrimidine, pyrazine, triazine, nitrile, isonitrile, benzonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, and combinations thereof; optionally, any two adjacent R T can join to form a ring, or an R W can join with a proximate R T to form a 5-membered ring,

with the proviso that when each of W 3 , W 4 , W 5 and W 6 are CR W , then at most one of these R W are aryl, heteroaryl or silyl.

18. The consumer product of claim 17 , wherein the consumer product is selected from the group consisting of a flat panel display, a curved display, a computer monitor, a medical monitor, a television, a billboard, a light for interior or exterior illumination and/or signaling, a heads-up display, a fully or partially transparent display, a flexible display, a rollable display, a foldable display, a stretchable display, a laser printer, a telephone, a cell phone, tablet, a phablet, a personal digital assistant (PDA), a wearable device, a laptop computer, a digital camera, a camcorder, a viewfinder, a micro-display that is less than 2 inches diagonal, a 3-D display, a virtual reality or augmented reality display, a vehicle, a video walls comprising multiple displays tiled together, a theater or stadium screen, and a sign.

19. A formulation comprising a compound according to claim 1 .