3,3'-Bicarbazole-based host materials for high-efficiency blue phosphorescent OLEDs with extremely low driving
Hisahiro Sasabe1, Naoki Toyota, Hiromi Nakanishi
1Department of Organic Device Engineering, Research Center for Organic Electronics, Yamagata university, Yonezawa, Japan. h-sasabe@yz.yamagata-u.ac.jp
Advanced Materials (Deerfield Beach, Fla.)
|May 30, 2012
Abstract:
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).
