3,3'-Bicarbazole-based host materials for high-efficiency blue phosphorescent OLEDs with extremely low driving voltage.
Four types of functionalized 3,3'-bicarbazole derivatives are prepared and investigated as a host material for blue phosphorescent OLEDs. By using a 3,3'-bicarbazole derivative/FIrpic film as an emissive layer, high power efficiency of 46 lm W(-1) (45 cd A(-1), EQE 20%) with an extremely low driving voltage at 3.1 V is obtained at 100 cd m(-2).
Department of Organic Device Engineering, Research Center for Organic Electronics, Yamagata university, Yonezawa, Japan. h-sasabe@yz.yamagata-u.ac.jp
Hisahiro
H
Sasabe
Naoki
N
Toyota
Hiromi
H
Nakanishi
Tasuku
T
Ishizaka
Yong-Jin
YJ
Pu
Junji
J
Kido
D002227:Carbazoles / Q000737:chemistry*; D003116:Color; D004553:Electric Conductivity; D049408:Luminescent Agents / Q000737:chemistry*; D012666:Semiconductors
D002227:Carbazoles; D049408:Luminescent Agents