Organic electroluminescent materials and devices

1 . A compound of Formula I:

wherein

each X 1 -X 17 is independently C or N;

R A , R B , R C , and R D each independently represent mono to the maximum allowable substitution, 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, germyl, arylalkyl, alkoxy, aryloxy, amino, silyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carboxylic acid, ether, ester, nitrile, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, selenyl, and combinations thereof;

wherein at least one of the following conditions (i) or (ii) is true:

(i) at least one of R C and R D is joined to its respective ring by a single bond and comprises pyrimidine, triazine, quinazoline, benzene, biphenyl, terphenyl, naphthalene, phenanthrene, anthracene, triphenylene, pyridine, pyrazine, fluorene, dibenzofuran, dibenzothiophene, carbazole, quinoline, isoquinoline, triarylboryl or quinoxaline, which may be further substituted;

(ii) at least one of R A and R B is selected from the group consisting of the following structures:

wherein R′ and R″ is independently a hydrogen or a substituent selected from the group consisting of aryl, phenyl, biphenyl, naphthyl, carbazolyl, triazinyl, pyrimidinyl, quinazolinyl and triphenylenyl; X 21 and X 22 is independently C or N; and Z represents NR″, O, or S, with R″ being aryl or heteroaryl.

2 . The compound of claim 1 , wherein each of 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, alkoxy, aryloxy, amino, silyl, boryl, alkenyl, cycloalkenyl, heteroalkenyl, aryl, heteroaryl, nitrile, isonitrile, sulfanyl, and combinations thereof.

3 . The compound of claim 1 , wherein one or two of R A , R B , R C , and R D comprises pyrimidine, triazine, quinazoline, carbazole, benzene, biphenyl, naphthalene, or triphenyl.

4 . The compound of claim 1 , wherein X 1 -X 17 are C.

5 . The compound of claim 1 , wherein exact one of X 1 -X 17 is N.

6 . The compound of claim 1 , wherein at least one of X 1 -X 4 is N.

7 . The compound of claim 1 , wherein at least one of X 5 -X 9 is N.

8 . The compound of claim 1 , wherein at least one of X 10 -X 13 is N.

9 . The compound of claim 1 , wherein at least one of X 14 -X 17 is N.

10 . The compound of claim 1 , wherein at least one of R A , R B , R C and R D is selected from the group consisting of any one of R A1 to R A16 as following:

wherein

R′ and R″ is independently a hydrogen or a substituent selected from the group consisting of aryl, phenyl, biphenyl, naphthyl, carbazolyl, triazinyl, pyrimidinyl, quinazolinyl and triphenylenyl;

X 18 -X 22 is C or N; and

Z represents NR″, O, or S, with R″ being aryl or heteroaryl.

11 . The compound of claim 1 , wherein at least one of R A , R B , R C and R D is selected from the group consisting of

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

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

14 . 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

each X 1 -X 17 is independently C or N;

R A , R B , R C , and R D each independently represent mono to the maximum allowable substitution, 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, germyl, arylalkyl, alkoxy, aryloxy, amino, silyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carboxylic acid, ether, ester, nitrile, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, selenyl, and combinations thereof;

wherein at least one of the following conditions (i) or (ii) is true:

(i) at least one of R C and R D is joined to its respective ring by a single bond and comprises pyrimidine, triazine, quinazoline, benzene, biphenyl, terphenyl, naphthalene, phenanthrene, anthracene, triphenylene, pyridine, pyrazine, fluorene, dibenzofuran, dibenzothiophene, carbazole, quinoline, isoquinoline, triarylboryl or quinoxaline, which may be further substituted;

(ii) at least one of R A and R B is selected from the group consisting of the following structures:

15 . The OLED of claim 14 , wherein the organic layer is an emissive layer and the compound is an emissive dopant or a non-emissive dopant.

16 . The OLED of claim 14 , wherein the compound is a host, and the organic layer is an emissive layer that comprises a phosphorescent emitter.

17 . The OLED of claim 16 , 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:

T is selected from the group consisting of B, Al, Ga, and In;

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

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 ;

R e and R f can be 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 number of substitutions to its associated ring;

each of R a1 , R b1 , R c1 , R d1 , 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, halide, alkyl, cycloalkyl, heteroalkyl, arylalkyl, alkoxy, aryloxy, amino, silyl, boryl, germyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carbonyl, carboxylic acid, ester, nitrile, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, selenyl, and combinations thereof; and

and any two adjacent substituents of R a , R b , R c , R d , R e and R f can be fused or joined to form a ring or form a multidentate ligand.

18 . The OLED of claim 14 , wherein the compound is an acceptor, and the OLED further comprises a sensitizer selected from the group consisting of a delayed fluorescence emitter, a phosphorescent emitter, and combination thereof.

19 . The OLED of claim 14 , wherein the compound is a fluorescent emitter, a delayed fluorescence emitter, or a component of an exciplex that is a fluorescent emitter or a delayed fluorescence emitter.

20 . A consumer product comprising 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

each X 1 -X 17 is independently C or N;

R A , R B , R C , and R D each independently represent mono to the maximum allowable substitution, 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, germyl, arylalkyl, alkoxy, aryloxy, amino, silyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carboxylic acid, ether, ester, nitrile, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, selenyl, and combinations thereof;

wherein at least one of the following conditions (i) or (ii) is true:

(i) at least one of R C and R D is joined to its respective ring by a single bond and comprises pyrimidine, triazine, quinazoline, benzene, biphenyl, terphenyl, naphthalene, phenanthrene, anthracene, triphenylene, pyridine, pyrazine, fluorene, dibenzofuran, dibenzothiophene, carbazole, quinoline, isoquinoline, triarylboryl or quinoxaline, which may be further substituted;

(ii) at least one of R A and R B is selected from the group consisting of the following structures: