Carrier injection and transport in blue phosphorescent organic light-emitting device with oxadiazole host.
作者： Tien-Lung Chiu , Pei-Yu Lee
DOI: 10.3390/IJMS13067575
关键词:
摘要: In this paper, we investigate the carrier injection and transport characteristics in iridium(III)bis[4,6-(di-fluorophenyl)-pyridinato-N,C2']picolinate (FIrpic) doped phosphorescent organic light-emitting devices (OLEDs) with oxadiazole (OXD) as bipolar host material of emitting layer (EML). When doping Firpic inside OXD, driving voltage OLEDs greatly decreases because FIrpic dopants facilitate electron from electron-transporting (ETL) into EML. With increasing dopant concentration, recombination zone shifts toward anode side, analyzed electroluminescence (EL) spectra. Besides, EL redshifts were also observed voltage, which means mobility is more sensitive to electric field than hole mobility. To further characteristics, was intentionally undoped at different positions close ETL, increased significantly proves dopant-assisted-electron-injection characteristic OLED. near blocking layer, only slightly increased, but current efficiency reduced main undoped. However, non-negligible emission still penetrates EML due certain hole-transporting OXD.
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