ORGANIC ELECTROLUMINESCENT MATERIALS AND DEVICES

1 . A compound comprising a structure of Formula I

wherein Y i is

 and Y j is

wherein:

R A , R B , R C , and R D each independently represents zero, mono, di-substitution or the maximum allowable substitution;

each R A , R B , R C , and R D is independently a hydrogen or a substituent selected from the group consisting of deuterium, halogen, alkyl, cycloalkyl, heteroalkyl, heterocycloalkyl, boryl, arylalkyl, alkoxy, aryloxy, amino, silyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carboxylic acid, ether, ester, nitrile, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, and combinations thereof;

at least one of R A , R B , R C , and R D comprises a carbazole moiety;

each of X 1 -X 16 is independently C or N; and

any two of R A , R B , R C , and R D can be joined or fused together to form a ring.

2 . The compound of claim 1 , wherein each R A , R B , R C , and R D is independently a hydrogen or a substituent selected from the group consisting of deuterium, fluorine, alkyl, cycloalkyl, heteroalkyl, boryl, alkoxy, aryloxy, amino, silyl, alkenyl, cycloalkenyl, heteroalkenyl, aryl, heteroaryl, nitrile, isonitrile, sulfanyl, and combinations thereof.

3 . The compound of claim 1 , wherein at least one of R A , R B , R C , and R D comprises a carbazole group.

4 . The compound of claim 1 , wherein two of R A , R B , R C , and R D are joined together to form a fused 5-membered or 6-membered carbocyclic or heterocyclic ring.

5 . The compound of claim 1 , wherein at least one of X 1 -X 16 is N.

6 . The compound of claim 1 , wherein X 1 -X 16 are C.

7 . The compound of claim 1 , wherein Y i is selected from the group consisting of:

wherein X 17 -X 32 are each independently C or N;

R E , R F , R G , and R H each independently represents zero, mono, di-substitution or the maximum allowable substitution;

each R E , R F , R G , and R H is independently a hydrogen or a substituent selected from the group consisting of deuterium, halogen, alkyl, cycloalkyl, heteroalkyl, heterocycloalkyl, boryl, arylalkyl, alkoxy, aryloxy, amino, silyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carboxylic acid, ether, ester, nitrile, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, and combinations thereof, and

any two of R E , R F , R G , and R H can be joined or fused together to form a ring.

8 . The compound of claim 1 , wherein Y i is selected from the group consisting of Y 1 -Y 36 , and Y j is selected from the group consisting of Y 1 -Y 43 , wherein Y 1 -Y 43 have the following structures:

9 . The compound of claim 1 , wherein the compound of Formula I is selected from the group consisting of:

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

an anode;

a cathode; and

an organic layer disposed between the anode and the cathode, wherein the organic layer comprises a compound of Formula I

wherein Y i is

 and Y j is

wherein:

R A , R B , R C , and R D each independently represents zero, mono, di-substitution or the maximum allowable substitution;

each R A , R B , R C , and R D is independently a hydrogen or a substituent selected from the group consisting of deuterium, halogen, alkyl, cycloalkyl, heteroalkyl, heterocycloalkyl, boryl, arylalkyl, alkoxy, aryloxy, amino, silyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carboxylic acid, ether, ester, nitrile, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, and combinations thereof;

at least one of R A , R B , R C , and R D comprises a carbazole moiety;

each of X 1 -X 16 is independently C or N; and

any two substituents can be joined or fused together to form a ring.

11 . The OLED of claim 10 , wherein the organic layer further comprises a second compound comprising a chemical structure selected from the group consisting of triazine, pyrimidine, pyridines, 9-dioxa-13b-boranaphtho[3,2,1-de]anthracene, aza-naphthalene, aza-fluorene, aza-triphenylene, aza-carbazole, aza-indolocarbazole, aza-dibenzothiophene, aza-dibenzofuran, and aza-dibenzoselenophene, and aza-(5,9-dioxa-13b-boranaphtho[3,2,1-de]anthracene).

12 . The OLED of claim 11 , wherein the second compound is selected from the group consisting of:

wherein:

K 1′ is O or S;

K 2′ , K 3′ , and K 4′ are N or CR 9 ;

K 5′ is selected from the group consisting of O, S and NR 10 ; and

R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R 7 , R 8 , R 9 and R 10 are independently a hydrogen or a substituent selected from the group consisting of deuterium, halogen, alkyl, cycloalkyl, heteroalkyl, heterocycloalkyl, boryl, arylalkyl, alkoxy, aryloxy, amino, silyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carboxylic acid, ether, ester, nitrile, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, and combinations thereof.

13 . The OLED of claim 11 , wherein the second compound is selected from the group consisting of:

14 . The OLED of claim 10 , wherein the organic layer further comprises a compound of Formula II

wherein:

M′ is Pt or Pd;

rings A′, B′, C′, and D′ each independently represents a 5-membered or 6-membered carbocyclic or heterocyclic ring;

X 1′ -X 12′ are each independently selected from the group consisting of carbon and nitrogen;

R A′ , R B′ , R C′ , and R D′ each independently represents mono to the maximum allowed number of substitutions, or no substitution;

each R A′ , R B′ , R C′ , and R D′ is independently a hydrogen or a substituent selected from the group consisting of deuterium, halogen, alkyl, cycloalkyl, heteroalkyl, heterocycloalkyl, boryl, arylalkyl, alkoxy, aryloxy, amino, silyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carboxylic acid, ether, ester, nitrile, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, and combinations thereof;

n′ is 0 or 1;

L 1′ , L 2′ , and L 3′ are each independently selected from the group consisting of a direct bond, BRR′, NR, PR, O, S, Se, C═O, S═O, SO 2 , CRR′, SiRR′, GeRR′, and combinations thereof;

when n′ is 1, L 4′ is selected from the group consisting of a direct bond, BRR′, NR, PR, O, S, Se, C═O, S═O, SO 2 , CRR′, SiRR′, GeRR′, and combinations thereof;

when n′ is 0, L 4′ is not present;

each Y 1′ , Y 2′ , Y 3′ , and Y 4′ is selected from the group consisting of a direct bond, O, and S;

wherein at least two of Y 1′ , Y 2′ , Y 3′ , and Y 4′ is a direct bond.

15 . The OLED of claim 14 , wherein the compound of Formula II is a tetradentate Pt complex that has at least one part of the ligand selected from the group consisting of:

wherein:

each Y 1 to Y 13 are independently selected from the group consisting of carbon and nitrogen;

Y′ is selected from the group consisting of B R e , N R e , P R e , O, S, Se, C═O, S═O, SO 2 , CR e R f , SiR e R f , and G e R e R f ,

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

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;

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 acid, ester, nitrile, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, and combinations thereof; and

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

16 . The OLED of claim 14 , wherein the compound of Formula II is selected from the group consisting of:

wherein:

L is selected form the group consisting of O, S, Se, NR, BR, BRR′, C═O, S═O, CRR′, SiRR′, and combinations thereof; and

each R A , R B , R C , R D , R E , and R F is independently a hydrogen or a substituent selected from the group consisting of deuterium, halogen, alkyl, cycloalkyl, heteroalkyl, heterocycloalkyl, boryl, arylalkyl, alkoxy, aryloxy, amino, silyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carboxylic acid, ether, ester, nitrile, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, and combinations thereof.

17 . The OLED of claim 10 , wherein the organic layer comprises a phosphorescent sensitizer and a fluorescent acceptor.

18 . The OLED of claim 10 , wherein the compound is a host, and the organic layer is an emissive layer that comprises a phosphorescent emitter.

19 . The OLED of claim 18 , wherein the phosphorescent emitter 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 C and N;

Y′ is selected from the group consisting of B R e , N R e , P R e , O, S, Se, C═O, S═O, SO 2 , CR e R f , SiR e R f , and G e R e R f ;

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

each R a , R b , R c , and R d independently represent zero, mono, or up to a maximum allowed substitution to its associated ring;

each of 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 acid, ester, nitrile, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, and combinations thereof; and 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.

20 . A consumer product comprising an organic light-emitting device comprising:

an anode;

a cathode; and

an organic layer disposed between the anode and the cathode,

wherein the organic layer comprises a compound of Formula I

wherein Y i is

and Y j is

wherein:

R A , R B , R C , and R D each independently represents zero, mono, di-substitution or the maximum allowable substitution;

each R A , R B , R C , and R D is independently a hydrogen or a substituent selected from the group consisting of deuterium, halogen, alkyl, cycloalkyl, heteroalkyl, heterocycloalkyl, boryl, arylalkyl, alkoxy, aryloxy, amino, silyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carboxylic acid, ether, ester, nitrile, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, and combinations thereof;

at least one of R A , R B , R C , and R D comprises a carbazole moiety;

each of X 1 -X 16 is independently C or N; and

any two substituents can be joined or fused together to form a ring.