Organic electroluminescent materials and devices

1. A compound comprising a triphenylene core of Formula I:

wherein each of R 1 , R 2 , and R 3 is independently a hydrogen, a non-fused aryl group or a non-fused heteroaryl six-membered ring having one or more meta-substituents;

wherein each meta-substituent is a non-fused aryl or heteroaryl six-membered ring optionally substituted with further substituents selected from the group consisting of non-fused aryl groups, non-fused heteroaryl groups, and alkyl groups; and

wherein at least one of R 1 , R 2 , and R 3 is a non-fused aryl or heteroaryl six-membered ring having at least one meta-substituent that is a non-fused aryl or heteroaryl group further substituted with one or more non-fused aryl or heteroaryl groups, wherein the at least one meta-substituent is substituted with a chain of at least two non-fused aryl or heteroaryl groups.

2. The compound of claim 1 , wherein at least two of R 1 , R 2 , and R 3 is a non-fused aryl or heteroaryl six-membered ring having at least one meta-substituent that is a non-fused aryl or heteroaryl group optionally substituted with further substituents selected from the group consisting of non-fused aryl groups, non-fused heteroaryl groups, and alkyl groups.

3. The compound of claim 1 , wherein each of R 1 , R 2 , and R 3 includes no more than three para-substituted phenyl rings.

4. The compound of claim 1 , wherein the compound has the structure:

wherein R′ 1 is a non-fused aryl group or a non-fused heteroaryl group; and

wherein R′ 1 is substituted with a chain of at least two non-fused aryl or heteroaryl groups.

5. A compound comprising the substructure F:

wherein R′ 1 is selected from the group consisting of a non-fused aryl group substituted with R a and a non-fused heteroaryl group substituted with R a , wherein R a is a non-fused aryl or heteroaryl, a branched or straight chain of non-fused aryls or heteroaryls, or an alkyl substituted non-fused aryl or an alkyl substituted non-fused heteroaryl group.

6. The compound of claim 5 , wherein R a is a branched or straight chain of non-fused aryls or heteroaryls, or an alkyl substituted non-fused aryl or an alkyl substituted non-fused heteroaryl group.

7. The compound of claim 5 ,

wherein R′ 1 is a straight or branched chain of two or more non-fused aryl groups substituted with R a or a straight or branched chain of two or more non-fused heteroaryl groups substituted with R a .

8. The compound of claim 5 , wherein the compound is any one of:

9. An organic light emitting device, comprising:

an anode;

a cathode;

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

wherein each of R 1 , R 2 , and R 3 is independently a hydrogen, a non-fused aryl group or a non-fused heteroaryl six-membered ring having one or more meta-substituents;

wherein each meta-substituent is a non-fused aryl or heteroaryl group optionally substituted with further substituents selected from the group consisting of non-fused aryl groups, non-fused heteroaryl groups, and alkyl groups; and

wherein at least one of R 1 , R 2 , and R 3 is a non-fused aryl or heteroaryl six-membered ring having at least one meta-substituent that is a non-fused aryl or heteroaryl group further substituted with one or more non-fused aryl or heteroaryl groups, wherein the at least one meta-substituent is substituted with a chain of at least two non-fused aryl or heteroaryl groups.

10. The organic light emitting device of claim 9 , wherein at least one of R 1 , R 2 , and R 3 is a heteroaryl six-membered ring selected from the group consisting of pyridine, pyrazine and pyrimidine, wherein said heteroaryl six-membered ring has at least one meta-substituent that is a non-fused aryl or heteroaryl group further substituted with one or more non-fused aryl or heteroaryl groups, wherein the at least one meta-substituent is substituted with a chain of at least two non-fused aryl or heteroaryl groups.

11. The compound of claim 1 , wherein at least one of R 1 , R 2 , and R 3 is a heteroaryl six-membered ring selected from the group consisting of pyridine, pyrazine and pyrimidine, wherein said heteroaryl six-membered ring has at least one meta-substituent that is a non-fused aryl or heteroaryl group further substituted with one or more non-fused aryl or heteroaryl groups, wherein the at least one meta-substituent is substituted with a chain of at least two non-fused aryl or heteroaryl groups.