Organic electroluminescent materials and devices

1. A compound of Formula X

wherein

ring A is a 6-membered aryl or heteroaryl ring, which is optionally substituted;

ring B is a 6-membered aryl or heteroaryl ring, which is optionally substituted;

wherein the hash lines represent ring A fused to W 3 and the carbon atom between W 3 and N and ring B fused to W 6 and the carbon atom between N and W 6 ;

W 1 , W 2 , W 3 , W 4 , W 5 , and W 6 are independently selected from CR 1 or N;

Z is selected from CR Z or N;

Y is selected from a group consisting of B(R 2 ) 2 , Al(R 2 ) 2 , Si(R 2 ) 2 , and Ge(R 2 ) 2 ; wherein

R Z and each R 1 and R 2 are 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, or optionally, two R 2 join to form a cycloalkyl or heterocyclic ring;

wherein optionally, R 1 can join with R Z to form a five-membered or six-membered, carbocyclic or heterocyclic ring, which is optionally substituted;

with the proviso that at least one of the following conditions (i) to (ii) is true:

(i) at least one of ring A or ring B is a 6-membered heteroaryl ring; and

(ii) the compound is represented by one of the following structures:

wherein R 7 and R 8 are each R 2 ; and

each R 6 is selected from the group consisting of C 1 -C 6 alkyl and C 1 -C 6 alkoxy; and

with the proviso that when Y is B(R 2 ) 2 and each R 2 is F, then:

ring A is not substituted with an aryl group;

ring B is not substituted with an aryl group; and

R 1 does not represent aryl.

2. The compound of claim 1 , wherein R Z and each R 1 and R 2 are 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.

3. The compound of claim 1 , wherein R Z and each R 1 and R 2 is independently selected from the group consisting of H, D, F, —CN, —CF 3 , alkyl, alkoxy, alkenyl, alkynyl, cycloalkyl, aryl, aryloxy, heterocycle, and heteroaryl.

4. The compound of claim 1 , wherein each W 1 , W 2 , W 4 , W 5 , and W 6 are CR 1 .

5. The compound of claim 1 , wherein one of W 1 , W 2 , or W 3 is N, and one of W 4 , W 5 , or W 6 is N.

6. The compound of claim 1 , wherein Y is B(R 2 ) 2 .

7. The compound of claim 1 , wherein Z is N.

8. The compound of claim 1 , wherein the compound is represented by the following structure:

wherein

X 1 , X 2 , X 3 , X 4 , X 5 , X 6 , X 7 , and X 8 are independently selected from CR 3 and N; wherein R 3 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, or optionally, any two adjacent R 3 join to form a ring.

9. The compound of claim 8 , wherein Z is N, and Y is B(R 2 ) 2 , wherein R 2 is independently selected from the group consisting of H, D, F, —CN, —CF 3 , alkyl, alkoxy, alkenyl, alkynyl, cycloalkyl, aryl, aryloxy, heterocycle, and heteroaryl.

10. The compound of claim 9 , the compound selected from the group consisting of

wherein

each R 6 , R 7 , and R 8 is independently selected from the group consisting of H, D, F, —CN, —CF 3 , C 1 -C 6 alkyl, C 1 -C 6 alkoxy, C 1 -C 6 alkenyl, C 5 -C 6 cycloalkyl, C 6 -C 10 aryl, C 6 -C 10 aryloxy, C 5 -C 6 heterocycle, and C 5 -C 10 heteroaryl.

11. The compound of claim 1 , wherein Z is N;

Y is BF 2 ; and

at least one of ring A or ring B is a 6-membered heteroaryl ring.

12. The compound of claim 1 , wherein the compound is represented by one of the following structures:

wherein Y is B;

wherein R 7 and R 8 are each F; and

each R 6 is selected from the group consisting of C 1 -C 3 alkyl and C 1 -C 3 alkoxy.

13. An optoelectronic device selected from the group consisting of a photovoltaic device, a photodetector device, a photosensitive device, and an OLED, the optoelectronic device including an organic layer that comprises a compound of Formula X

wherein

ring A is a 6-membered aryl or heteroaryl ring, which is optionally substituted;

ring B is a 6-membered aryl or heteroaryl ring, which is optionally substituted;

wherein the hash lines represent ring A fused to W 3 and the carbon atom between W 3 and N and ring B fused to W 6 and the carbon atom between N and W 6 ;

W 1 , W 2 , W 3 , W 4 , W 5 , and W 6 are independently selected from CR 1 or N;

Z is selected from CR Z or N;

Y is selected from a group consisting of C(R 2 ) 2 , B(R 2 ) 2 , Al(R 2 ) 2 , Si(R 2 ) 2 , and Ge(R 2 ) 2 ; wherein

R Z and each R 1 and R 2 are 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, or optionally, two R 2 join to form a cycloalkyl or heterocyclic ring;

wherein optionally, R 1 can join with R Z to form a five-membered or six-membered, carbocyclic or heterocyclic ring, which is optionally substituted;

with the proviso that at least one of the following conditions (i) to (ii) is true:

(i) at least one of ring A or ring B is a 6-membered heteroaryl ring; and

(ii) the compound is represented by one of the following structures:

wherein R 7 and R 8 are each R 2 ; and

each R 6 is selected from the group consisting of C 1 -C 6 alkyl and C 1 -C 6 alkoxy; and

with the proviso that when Y is B(R 2 ) 2 and each R 2 is F, then:

ring A is not substituted with an aryl group;

ring B is not substituted with an aryl group; and

R 1 does not represent aryl.

14. The optoelectronic device of claim 13 is an OLED, wherein the organic layer is disposed between an anode and a cathode.

15. The OLED of claim 14 , wherein the organic layer further comprises a host material, wherein the host material comprises at least one chemical group selected from the group consisting of triphenylene, carbazole, dibenzothiophene, dibenzofuran, dibenzoselenophene, azatriphenylene, azacarbazole, aza-dibenzothiophene, aza-dibenzofuran, and aza-dibenzoselenophene.

16. The OLED of claim 14 , wherein the organic layer further comprises a host material selected from the group consisting of

and combinations thereof.

17. The OLED of claim 14 , wherein the organic layer further comprises a phosphorescent emissive dopant with a formula of M(L A ) x (L B ) y (L C ) z wherein L A , L B and L C are each a ligand; and wherein x is 1, 2, or 3; y is 0, 1, or 2; z is 0, 1, or 2; and x+y+z is the oxidation state of a metal M selected from the group consisting of Os, Ir, Cu, Pt, and Pd;

wherein L A , L B and L C are each independently selected from the group consisting of

wherein

each Y 1 to Y 3 are independently selected from the group consisting of C and N;

Y 1 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 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 e , R d , R e and R f is independently hydrogen or a substituent selected from the group consisting of 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; or optionally, any two adjacent substituents of R a , R b , R e , or R d join to form a ring or form a multidentate ligand.

18. The OLED of claim 17 , wherein the metal is selected from Cu, Pt, or Pd, and x is 1, y is 1, and z is 0, wherein ligand L A and ligand L B can be the same or different, and the ligands L A and L B connect to form a tetradentate ligand.

19. The OLED of claim 14 , wherein the OLED further comprises one or more additional emitters selected from the group consisting of a phosphorescent emitter, a fluorescent emitter, a thermally activated delayed fluorescent emitter, an E-type delayed fluorescent emitter, and combinations thereof.

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, the organic layer comprising a compound of Formula X

wherein

ring A is a 6-membered aryl or heteroaryl ring, which is optionally substituted;

ring B is a 6-membered aryl or heteroaryl ring, which is optionally substituted;

wherein the hash lines represent ring A fused to W 3 and the carbon atom between W 3 and N and ring B fused to W 6 and the carbon atom between N and W 6 ;

W 1 , W 2 , W 3 , W 4 , W 5 , and W 6 are independently selected from CR 1 or N;

Z is selected from CR Z or N;

Y is selected from a group consisting of C(R 2 ) 2 , B(R 2 ) 2 , Al(R 2 ) 2 , Si(R 2 ) 2 , and Ge(R 2 ) 2 ; wherein

R Z and each R 1 and R 2 are 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, or optionally, two R 2 join to form a cycloalkyl or heterocyclic ring;

wherein optionally, R 1 can join with R Z to form a five-membered or six-membered, carbocyclic or heterocyclic ring, which is optionally substituted;

with the proviso that at least one of the following conditions (i) to (ii) is true:

(i) at least one of ring A or ring B is a 6-membered heteroaryl ring; and

(ii) the compound is represented by one of the following structures:

wherein R 7 and R 8 are each R 2 ; and

each R 6 is selected from the group consisting of C 1 -C 6 alkyl and C 1 -C 6 alkoxy; and

with the proviso that when Y is B(R 2 ) 2 and each R 2 is F, then:

ring A is not substituted with an aryl group;

ring B is not substituted with an aryl group; and

R 1 does not represent aryl;

wherein the consumer product is selected from the group consisting of a flat panel display, a computer monitor, a medical monitor, a television, a billboard, a light for interior or exterior illumination and/or signaling, a heads-up display, a fully or partially transparent display, a flexible display, a laser printer, a telephone, a cell phone, tablet, a phablet, a personal digital assistant (PDA), a wearable device, a laptop computer, a digital camera, a camcorder, a viewfinder, a micro-display that is less than 2 inches diagonal, a 3-D display, a virtual reality or augmented reality display, a vehicle, a video wall comprising multiple displays tiled together, a theater or stadium screen, a light therapy device, and a sign.