Organic electroluminescent materials and devices

1. A compound having a structure of Formula 1:

wherein each one of X 1 , X 2 , X 3 , X 4 , X 5 , X 6 , X 7 , X 8 , X 9 , X 10 , X 11 , X 12 , X 13 , X 14 , X 15 , and X 16 is independently selected from the group consisting of CR and N,

wherein at least two adjacent of X 1 , X 2 , X 3 , X 4 , X 5 , X 6 , X 7 , X 8 , X 9 , X 10 , X 11 , X 12 , X 13 , X 14 , X 15 , and X 16 are CR;

wherein at least one pair of adjacent Rs is

fused to one of the Ring A, Ring B, Ring C, or Ring D;

wherein each instance of Y 1 , Y 2 , Y 3 , and Y 4 is independently selected from the group consisting of CR 1 and N;

wherein each instance of Z is independently selected from the group consisting of CR 2 R 3 , NR 4 , O, S and Se;

wherein each instance of R, R 1 , R 2 , R 3 , and R 4 are independently selected from the group consisting of hydrogen, deuterium, halide, alkyl, haloalkyl, cycloalkyl, heteroalkyl, arylalkyl, alkoxy, thioalkoxy, aryloxy, thioaryloxy, amino, arylamino, diarylamino, carbazolyl, silyl, halosilyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carbonyl, carboxylic acids, ester, nitrile, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, and combinations thereof;

wherein any adjacent substituents of R, R 1 , R 2 , R 3 , and R 4 are optionally joined or fused into a ring; and

wherein at least one of the following is true:

(i) at least one of X 1 to X 16 is N;

(ii) at least one of Y 1 to Y 4 is N;

(iii) at least one of Y 1 to Y 4 is CR 1 where R 1 is aryl or heteroaryl, which may be further substituted by a moiety selected from the group consisting of hydrogen, deuterium, halide, alkyl, haloalkyl, cycloalkyl, heteroalkyl, arylalkyl, alkoxy, thioalkoxy, aryloxy, thioaryloxy, amino, arylamino, diarylamino, carbazolyl, silyl, halosilyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carbonyl, carboxylic acids, ester, nitrile, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, and combinations thereof; and

(iv) wherein Ring A, Ring B, Ring C, and Ring D each include

fused thereto, and at least one Z is different from at least one other Z.

2. The compound of claim 1 , wherein at least one Z is CR 2 R 3 .

3. The compound of claim 1 , wherein at least one Z is NR 4 .

4. The compound of claim 1 , wherein at least one Z is selected from the group consisting of O, S and Se.

5. The compound of claim 1 , wherein at least one of options (ii), (iii), and (iv) is true, and each one of X 1 to X 16 is CR.

6. The compound of claim 1 , wherein at least one of options (iii) and (iv) is true, and each one of X 1 to X 16 is CR, and each one of Y 1 to Y 4 is CR 1 .

7. The compound of claim 1 , wherein at least one of options (i), (ii), and (iii) is true, and at least two pairs of adjacent Rs are

which can be the same or different.

8. The compound of claim 7 , wherein at least one of options (i), (ii), and (iii) is true, and one pair of adjacent Rs on Ring A, and one pair of adjacent Rs on Ring D is

9. The compound of claim 7 , wherein at least one of options (i), (ii), and (iii) is true, and one pair of adjacent Rs on Ring A is

and one pair of adjacent Rs on Ring B is

10. The compound of claim 1 , wherein at least three pairs of adjacent Rs are

which can be same or different.

11. The compound of claim 1 , wherein option (iv) is met.

12. A device comprising one or more organic light-emitting devices, at least one of the one or more organic light emitting devices comprising:

an anode;

a cathode; and

an organic layer, disposed between the anode and the cathode, comprising a compound having a structure of Formula 1:

wherein each one of X 1 , X 2 , X 3 , X 4 , X 5 , X 6 , X 7 , X 8 , X 9 , X 10 , X 11 , X 12 , X 13 , X 14 , X 15 , and X 16 is independently selected from the group consisting of CR and N,

wherein at least two adjacent of X 1 , X 2 , X 3 , X 4 , X 5 , X 6 , X 7 , X 8 , X 9 , X 10 , X 11 , X 12 , X 13 , X 14 , X 15 , and X 16 are CR;

wherein at least one pair of adjacent Rs is

fused to one of the Ring A, Ring B, Ring C, or Ring D;

wherein each instance of Y 1 , Y 2 , Y 3 , and Y 4 is independently selected from the group consisting of CR 1 and N;

wherein each instance of Z is independently selected from the group consisting of CR 2 R 3 , NR 4 , O, S and Se;

wherein each instance of R, R 1 , R 2 , R 3 , and R 4 are independently selected from the group consisting of hydrogen, deuterium, halide, alkyl, haloalkyl, cycloalkyl, heteroalkyl, arylalkyl, alkoxy, thioalkoxy, aryloxy, thioaryloxy, amino, arylamino, diarylamino, carbazolyl, silyl, halosilyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carbonyl, carboxylic acids, ester, nitrile, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, and combinations thereof combinations thereof;

wherein any adjacent substituents of R, R 1 , R 2 , R 3 , and R 4 are optionally joined or fused into a ring; and

wherein at least one of the following is true:

(i) at least one of X 1 to X 16 is N;

(ii) at least one of Y 1 to Y 4 is N;

(iii) at least one of Y 1 to Y 4 is CR 1 where R 1 is aryl or heteroaryl, which may be further substituted by a moiety selected from the group consisting of hydrogen, deuterium, halide, alkyl, haloalkyl, cycloalkyl, heteroalkyl, arylalkyl, alkoxy, thioalkoxy, aryloxy, thioaryloxy, amino, arylamino, diarylamino, carbazolyl, silyl, halosilyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carbonyl, carboxylic acids, ester, nitrile, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, and combinations thereof; and

(iv) wherein Ring A, Ring B, Ring C, and Ring D each include

fused thereto, and at least one Z is different from at least one other Z.

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

14. The device of claim 12 , wherein the organic layer further comprises an 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 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, 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.

15. The device of claim 12 , wherein the organic layer is a blocking layer and the compound having Formula I is a blocking material in the organic layer.

16. The device of claim 12 , wherein the organic layer is a transporting layer and the compound having Formula I is a transporting material in the organic layer.

17. The device of claim 12 , wherein the device is selected from the group consisting of a consumer product, an electronic component module, an organic light-emitting device, and a lighting panel.

18. A formulation comprising a compound having a structure of Formula 1:

wherein each one of X 1 , X 2 , X 3 , X 4 , X 5 , X 6 , X 7 , X 8 , X 9 , X 10 , X 11 , X 12 , X 13 , X 14 , X 15 , and X 16 is independently selected from the group consisting of CR and N,

wherein at least two adjacent of X 1 , X 2 , X 3 , X 4 , X 5 , X 6 , X 7 , X 8 , X 9 , X 10 , X 11 , X 12 , X 13 , X 14 , X 15 , and X 16 are CR;

wherein at least one pair of adjacent Rs is

fused to one of the Ring A, Ring B, Ring C, or Ring D;

wherein each instance of Y 1 , Y 2 , Y 3 , and Y 4 is independently selected from the group consisting of CR 1 and N;

wherein each instance of Z is independently selected from the group consisting of CR 2 R 3 , NR 4 , O, S and Se;

wherein each instance of R, R 1 , R 2 , R 3 , and R 4 are independently selected from the group consisting of hydrogen, deuterium, halide, alkyl, haloalkyl, cycloalkyl, heteroalkyl, arylalkyl, alkoxy, thioalkoxy, aryloxy, thioaryloxy, amino, arylamino, diarylamino, carbazolyl, silyl, halosilyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carbonyl, carboxylic acids, ester, nitrile, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, and combinations thereof combinations thereof;

wherein any adjacent substituents of R, R 1 , R 2 , R 3 , and R 4 are optionally joined or fused into a ring; and

wherein at least one of the following is true:

(i) at least one of X 1 to X 16 is N;

(ii) at least one of Y 1 to Y 4 is N;

(iii) at least one of Y 1 to Y 4 is CR 1 where R 1 is aryl or heteroaryl, which may be further substituted by a moiety selected from the group consisting of hydrogen, deuterium, halide, alkyl, haloalkyl, cycloalkyl, heteroalkyl, arylalkyl, alkoxy, thioalkoxy, aryloxy, thioaryloxy, amino, arylamino, diarylamino, carbazolyl, silyl, halosilyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carbonyl, carboxylic acids, ester, nitrile, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, and combinations thereof; and

(iv) wherein Ring A, Ring B, Ring C, and Ring D each include

fused thereto, and at least one Z is different from at least one other Z.

19. The compound of claim 1 , wherein at least one R 1 of one

is selected from the group consisting of alkyl, cycloalkyl, aryl, heteroaryl, and combinations thereof.

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