Organic electroluminescent materials and devices

1. A compound having Formula I:

A-(L 1 ) n -Z-(L 2 ) m -B  (Formula I);

wherein A and B are each independently selected from the group consisting of:

wherein R 1 , R 2 and R 3 are each independently selected from the group consisting of hydrogen, deuterium, halogen, 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;

wherein at least one of R 1 , R 2 and R 3 comprises aryl or heteroaryl; wherein the aryl or heteroaryl is optionally substituted;

wherein L 1 and L 2 are each independently selected from the group consisting of aryl, alkyl, cycloalkyl, non-aromatic heterocycle, silyl, oxygen, and combination thereof;

wherein L 1 and L 2 may be optionally substituted with one or more substituents selected from the group consisting of deuterium, halogen, 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;

wherein n and m are each independently an integer of 0 to 3, provided that n and m are each 0, or n and m are each not 0;

wherein Z is selected from the group consisting of:

and

wherein Z can be optionally substituted by one or more substituents selected from the group consisting of deuterium, halogen, 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;

with the proviso that when Z is

then at least one of A and B comprises triazine;

with the further proviso that when Z represents

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

(i) A and B are different; or

(ii) Z is unsubstituted or substituted by one or more substituents selected from the group consisting of deuterium, halogen, alkyl, cycloalkyl, heteroalkyl, arylalkyl, alkoxy, aryloxy, amino, silyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, heteroaryl, acyl, carbonyl, carboxylic acid, ester, nitrile, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, and combinations thereof; and

with the further proviso that when Z represents

then at least one of the following conditions (iii) or (iv) is true:

(iii) A and B are different; or

(iv) n is at least 1, m is at least 1, and at least one L is para-phenylene.

2. The compound of claim 1 , wherein n is 0, and m is 0.

3. The compound of claim 1 , wherein n and m are not 0.

4. The compound of claim 1 , wherein R 1 , R 2 and R 3 are each independently selected from the group consisting of phenyl, biphenyl, naphthalene, terphenyl, naphthalene, triphenylene, phenanthrene, anthracene, pyrene, chrysene, fluoranthene, dibenzofuran, dibenzothiophene, benzofuran, benzothiophene, dibenzoselenophene, benzoselenophene, carbazole, indolocarbazole, indolodibenzofuran, indolodibenzothiophene, indolofluorene, pyridine, pyrimidine, phenylpyridine, quinolone, quinazoline, quinoxaline, benzoquinoline, phenanthridine, phenanthroline, acridine, azatriphenylene, azadibenzofuran, azadibenzothiophene, azadibenzoselenophene and azacarbazole.

5. The compound of claim 1 , wherein A and B are each independently selected from the group consisting of:

6. A compound selected from the group consisting of:

7. A compound selected from the group consisting of:

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

an anode;

a cathode; and

an organic layer, disposed between the anode and the cathode, comprising a compound selected from the group consisting of a compound of Formula I,

wherein in Formula I:

A-(L 1 ) n -Z-(L 2 ) m -B  (Formula I);

wherein A and B are each independently selected from the group consisting of:

wherein R 1 , R 2 and R 3 are each independently selected from the group consisting of hydrogen, deuterium, halogen, 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;

wherein at least one of R 1 , R 2 and R 3 comprises aryl or heteroaryl; wherein the aryl or heteroaryl is optionally substituted;

wherein L 1 and L 2 are each independently selected from the group consisting of aryl, alkyl, cycloalkyl, non-aromatic heterocycle, silyl, oxygen, and combination thereof;

wherein L 1 and L 2 may be optionally substituted with one or more substituents selected from the group consisting of deuterium, halogen, 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;

wherein n and m are each independently an integer of 0 to 3;

wherein Z is selected from the group consisting of:

and

wherein Z can be optionally substituted by one or more substituents selected from the group consisting of deuterium, halogen, 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;

with the proviso that when Z is

then at least one of A and B comprises triazine;

with the further proviso that when Z represents

then at least one of the following conditions (i), (ii), or (iii) is true:

(i) n is 0 and m is not 0;

(ii) A and B are different; or

(iii) Z is unsubstituted or substituted by one or more substituents selected from the group consisting of deuterium, halogen, alkyl, cycloalkyl, heteroalkyl, arylalkyl, alkoxy, aryloxy, amino, silyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, heteroaryl, acyl, carbonyl, carboxylic acid, ester, nitrile, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, and combinations thereof; and

with the further proviso that when Z represents

then at least one of the following conditions (iv), (v), or (vi) is true:

(iv) n is 0 and m is not 0;

(v) A and B are different; or

(vi) n is at least 1, m is at least 1, and at least one L is para-phenylene.

9. The OLED of claim 8 , wherein the organic layer is an emissive layer and the compound is a host.

10. The OLED of claim 8 , 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 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 substitutents of R a , R b , R c , and R d are optionally fused or joined to form a ring or form a multidentate ligand.

11. The OLED of claim 8 , wherein the organic layer is a blocking layer and the compound is a blocking material in the organic layer.

12. The OLED of claim 8 , wherein the organic layer is a transporting layer and the compound is a transporting material in the organic layer.

13. The OLED of claim 8 , wherein the OLED is incorporated into a device selected from the group consisting of a consumer product, an electronic component module, and a lighting panel.

14. A formulation comprising a compound of claim 1 .

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

an anode;

a cathode; and

an organic layer, disposed between the anode and the cathode, comprising a compound of claim 6 .

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

an anode;

a cathode; and

an organic layer, disposed between the anode and the cathode, comprising a compound of claim 7 .