OLED device with asymmetric host
View Patent ↗Disclosed is an OLED device comprising an anode and a cathode and located there-between a light emitting layer containing a light emitting dopant and a host comprising a monoanthracene derivative of formula (I): wherein R 1 –R 8 are H; R 9 is not the same as R 10 ; R 9 is a biphenyl group containing no fused rings with aliphatic carbon ring members; R 10 is an ortho-substituted- or meta monosubstituted phenyl group; provided that R 9 and R 10 are free of amines and sulfur compounds.
1. An OLED device comprising an anode and a cathode and located there-between a light emitting layer containing a light emitting dopant and a host comprising a monoanthracene derivative of formula (I):
wherein
R 1 –R 8 are H;
R 9 is not the same as R 10 ;
R 9 is a biphenyl group containing no fused rings with aliphatic carbon ring members;
R 10 is an ortho-substituted- or meta monosubstituted phenyl group wherein the substituent is selected from fluorine, hydroxy, cyano, alkyl, alkoxy, aryloxy, aryl, carboxy, trimethylsilyl, and heterocyclic oxy groups;
provided that R 9 and R 10 are free of amines and sulfur compounds.
2. The device of claim 1 wherein R 9 is an unsubstituted biphenyl group.
3. The device of claim 1 wherein at least one of the phenyl rings of the biphenyl has a ring fused thereto.
4. The device of claim 1 wherein the biphenyl contains two phenyl ring groups without fused rings.
5. The device of claim 3 wherein the biphenyl is a 2-biphenyl.
6. The device of claim 3 wherein the biphenyl is a 3-biphenyl.
7. The device of claim 3 wherein the biphenyl is a 4-biphenyl.
8. The device of claim 1 wherein all of the phenyl rings of the biphenyl group are unsubstituted.
9. The device of claim 1 wherein the biphenyl is substituted with at least one substituent selected from fluorine, hydroxy, cyano, alkyl, alkoxy, aryloxy, aryl, carboxy, trimethylsilyl and heterocyclic oxy groups.
10. The device of claim 1 wherein R 10 is ortho-substituted.
11. The device of claim 10 wherein the ortho substituent is selected from fluorine, alkyl, and aryl groups.
12. The device of claim 10 wherein the R 10 ortho substituent is a phenyl group.
13. The device of claim 1 wherein R 10 is meta mono-substituted.
14. The device of claim 13 wherein the R 10 substituent is selected from fluorine, alkyl, and aryl groups.
15. The device of claim 13 where in the R 10 meta substituent is a phenyl group.
16. The device of claim 13 where in the meta substituent is a naphthyl group.
17. The device of claim 13 wherein the mete substituent is a biphenyl group.
18. The device of claim 1 wherein the light emitting dopant emits blue light.
19. The device of claim 1 wherein the light emitting dopant emits green light.
20. The device of claim 1 including in one or more light emitting layers compounds sufficient for the device to emit white light.
21. The device of claim 1 including a co-host.
22. The device of claim 21 including a polymeric co-host.
23. The device of claim 21 including an oxinoid compound co-host.
24. The device of claim 23 wherein the oxinoid is Alq.
25. A display incorporating the device of claim 1 .
26. An area lighting system incorporating the device of claim 1 .