Organic electroluminescent materials and devices
Disclosed is an organic electroluminescent device including an anode, a cathode, and an emissive layer between the anode and the cathode, the emissive layer including a phosphorescent material and a compound having a repeat unit that contains a novel triphenylene moiety. A preferred group of the novel triphenylene moiety are triphenylenes that are substituted with a non-fused aryl group having one or more meta-substituents, where each meta-substituent is a non-fused aryl group optionally substituted with further substituents selected from the group consisting of non-fused aryl groups and alkyl groups. A further preferred group of compounds are triphenylenes that are substituted with a non-fused heteroaryl group having one or more meta-substituents, where 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. The compounds may be useful in phosphorescent organic light emitting devices.
1. 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, or a non-fused aryl group having one or more meta-substituents,
wherein each meta-substituent is a non-fused aryl group optionally substituted with further substituents selected from the group consisting of non-fused aryl groups and alkyl groups, and
wherein at least one of R 1 , R 2 , and R 3 is a non-fused aryl group having at least one meta-substituent that is a non-fused aryl group further substituted with one or more non-fused aryl groups.
2. The organic light emitting device of claim 1 , wherein the at least one meta-substituent is substituted with a chain of at least two non-fused aryl groups.
3. The organic light emitting device of claim 1 , wherein the organic layer is an emitting layer having a host and an emissive dopant, and the compound comprising a triphenylene core of Formula I is the host.
4. The organic light emitting device of claim 1 , wherein the compound comprising a triphenylene core of Formula I comprising any one of substructures F through O:
wherein each of R′ 1-6 is independently a hydrogen, or a non-fused aryl group, optionally substituted with R a , wherein in each of the substructures at least one of R′ 1-6 is a non-fused aryl group substituted with R a , wherein R a is a non-fused aryl a branched or straight chain of non-fused aryls or alkyl substituted aryl.
5. The organic light emitting device of claim 4 , wherein the compound having the substructure F
wherein R′ 1 is a straight or branched chain of two or more non-fused aryl groups.
6. The organic light emitting device of claim 4 , wherein the compound having the substructure F is selected from the group consisting of:
7. A compound comprising a triphenylene core of Formula I:
wherein each of R 1 , R 2 , and R 3 is independently a hydrogen, or a non-fused aryl group having one or more meta-substituents;
wherein each meta-substituent is a non-fused aryl group optionally substituted with further substituents selected from the group consisting of non-fused aryl groups and alkyl groups; and
wherein at least one of R 1 , R 2 , and R 3 is a non-fused aryl group having at least one meta-substituent that is a non-fused aryl group further substituted with one or more non-fused aryl groups.
8. The compound of claim 7 , wherein at least one meta-substituent is substituted with a chain of at least two non-fused aryl groups.
9. The compound of claim 7 , wherein at least two of R 1 , R 2 , and R 3 are each a non-fused aryl group having at least one meta-substituent that is a non-fused aryl group optionally substituted with further substituents selected from the group consisting of non-fused aryl groups and alkyl groups.
10. The compound of claim 7 , wherein each of R 1 , R 2 , and R 3 includes no more than three para-substituted phenyl rings.
11. The compound of claim 7 having no more than three para-substituted phenyl rings including the phenyl rings of the triphenylene core.
12. The compound of claim 7 comprising any one of substructures F-O:
wherein each of R′ 1-6 is independently a hydrogen, or a non-fused aryl group, optionally substituted with R a , wherein in each of the substructures at least one of R′ 1-6 is a non-fused aryl group substituted with R a , wherein R a is a non-fused aryl a branched or straight chain of non-fused aryls or alkyl substituted aryl.
13. A compound selected from the group consisting of:
wherein each of R′ 1 , R′ 2 , R′ 3 , and R′ 4 is an unsubstituted non-fused aryl group.
14. The compound of claim 13 , wherein the compound is selected from the group consisting of:
15. The compound of claim 7 having substructure F:
wherein R′ 1 is a straight or branched chain of two or more non-fused aryl groups.
16. The compound of claim 15 , wherein the compound is any one of:
17. The compound of claim 12 having substructure F:
wherein R′ 1 is a non-fused aryl group substituted with at least one alkyl substituted phenyl group.
18. The compound of claim 17 , wherein R′ 1 is a non-fused aryl group substituted with two alkyl substituted phenyl groups.
19. The compound of claim 18 , wherein the compound is:
20. The compound of claim 7 , wherein the compound is: