Electron favorable bipolar host for efficient blue OLEDs

摘要: In this study, we report a bistriazoles derivative to be the wide bandgap host for blue emitters. particular, possesses of 4.0 eV and bipolar carrier transportation behavior. addition, its behavior is classified rare case electron-favorable transportation, which was identified by time-of-flight measurement unipolar device. The electron mobility little faster than hole one, benefits adjustment balance in emitting layer. Employing phosphorescent OLED, device exhibits high-efficiency performance with 30.2%EQE.