Organic electroluminescent materials and devices

1. A first compound selected from the group consisting of:

2. A composition comprising the first compound of claim 1 and a second compound selected from the group consisting of:

wherein,

R E to R U each independently represents mono to the maximum allowable substitutions, or no substitution;

each R 4 , R 5 , and R E to R U is independently hydrogen or a substituent selected from the group consisting of deuterium, halogen, alkyl, cycloalkyl, heteroalkyl, heterocycloalkyl, 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;

any two substituents may be joined or fused together to form a ring;

Y is O or S; and

Ar 3 is a substituted or unsubstituted aryl ring.

3. The composition of claim 2 , wherein each R 4 , R 5 , and R E to R U is independently hydrogen, or a substituent selected from the group consisting of deuterium, fluorine, alkyl, cycloalkyl, heteroalkyl, alkoxy, aryloxy, amino, silyl, alkenyl, cycloalkenyl, heteroalkenyl, aryl, heteroaryl, nitrile, isonitrile, sulfanyl, and combinations thereof.

4. The composition of claim 2 , wherein the second compound is selected from the group consisting of:

5. The composition of claim 2 , wherein the first compound has an evaporation temperature T 1 of 150 to 350° C.;

wherein the second compound has an evaporation temperature T 2 of 150 to 350° C.;

wherein the absolute value of T 1 -T 2 is less than 20° C.;

wherein a ratio stability in a film formed by evaporating the mixture in a vacuum deposition tool at a constant pressure between 1×10 −6 Torr to 1×10 −9 Torr, at a 2 Å/sec deposition rate on a surface position at a predefined distance away from the mixture being evaporated is equal to or less than 1.

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

an anode;

a cathode; and

an organic layer, disposed between the anode and the cathode, comprising the first compound of claim 1 .

7. The OLED of claim 6 , wherein the organic layer is an emissive layer and the first compound is a host material.

8. The OLED of claim 6 , 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 is 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 GeR e R f ;

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

each R a , R b , R e , and R d independently represents from mono substitution to the maximum allowable substitutions, or no substitution;

each R a , R b , R c , R d , R e and R f is independently hydrogen or a substituent selected from the group consisting of deuterium, halogen, alkyl, cycloalkyl, heteroalkyl, heterocycloalkyl, 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 adjacent substituents of R a , R b , R e , and R d can be fused or joined to form a ring or form a multidentate ligand.

9. The OLED of claim 6 , wherein the organic layer is a blocking layer and the first compound is a blocking material in the organic layer; or the organic layer is a transporting layer and the first compound is a transporting material in the organic layer.

10. 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, comprising the first compound of claim 1 .

11. A first compound having the structure:

wherein Ar 1 is aryl comprising at least three phenyl rings joined to form a chain;

wherein N is attached to one of the phenyl rings at the end of the chain;

at least one of the following is true:

i) at least two three of the phenyl rings are fused to form a phenanthryl group, wherein said phenanthryl group is directly bonded to the phenyl directly bonded to N; or

ii) the phenyl directly bonded to N and a phenyl directly bonded to the phenyl directly bonded to N are substituted with hydrogen or a phenyl group that can be further substituted with additional phenyl groups,

wherein the phenyl directly bonded to N directly bonds to at least two additional phenyl groups, wherein the at least two additional phenyl groups are bonded to different carbon atoms of the phenyl directly bonded to N,

and/or

a phenyl directly bonded to the phenyl directly bonded to N bonds to at least three phenyl groups, wherein the at least three phenyl groups:

are bonded to different carbon atoms of the phenyl directly bonded to the phenyl directly bonded to N, and

include the phenyl directly bonded to N.

12. The first compound of claim 11 , wherein Ar 1 comprises four or more non-fused phenyl rings.

13. The first compound of claim 11 , wherein Ar 1 comprises five or more non-fused phenyl rings.

14. The first compound of claim 11 , selected from the group consisting of:

15. A composition comprising the first compound of claim 11 and a second compound selected from the group consisting of:

wherein,

R V , R w , R X , R Y , R z , R AA , R BB , R CC , R DD , R EE , R FF , and R GG each independently represent mono to the maximum allowable substitutions, or no substitution;

each R V , R w , R x , R Y , R Z , R AA , R BB , R CC , R DD , R EE , R FF , and R GG is independently hydrogen, or a substituent selected from the group consisting of deuterium, halogen, alkyl, cycloalkyl, heteroalkyl, heterocycloalkyl, 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;

Y is O or S;

Ar 4 , Ar 5 , Ar 6 , A 7 , and Ar 8 are each independently a substituted or unsubstituted aryl ring;

X 4 , X 5 , X 6 , X 7 , X 8 , X 11 and X 12 are each independently N or CH;

at least two of X 4 , X 5 , and X 6 are N;

at least two of X 7 , X 8 , and X 9 are N;

at least two of X 10 , X 11 , and X 12 are N;

any two substituents may be joined or fused together to form a ring; and

L is either an aromatic linker or a direct bond.

16. The composition of claim 15 , wherein each R V , R w , R X , R Y , R z , R AA , R BB , R Cc , R DD , R EE , R FF , and R GG is independently hydrogen, or a substituent selected from the group consisting of deuterium, fluorine, alkyl, cycloalkyl, heteroalkyl, alkoxy, aryloxy, amino, silyl, alkenyl, cycloalkenyl, heteroalkenyl, aryl, heteroaryl, nitrile, isonitrile, sulfanyl, and combinations thereof.

17. The composition of claim 15 , wherein the second compound is selected from the group consisting of:

18. A composition comprising a first compound and a second compound;

wherein the first compound is selected from the group consisting of:

and

wherein the second compound is selected from the group consisting of: