Inverted organic light-emitting devices using a charge-generation unit as an electron injector

Ruiqing Li, Jiong Wang, Yue Qin, Chenyang Liu, Yuzhu Wang, Xinwen Zhang, Yanan Xu, Yuehua Chen, Wen Yong Lai, Yonghua Li, Wei Huang

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

Efficient green fluorescent and phosphorescent inverted organic light emitting devices (IOLEDs) with a non-doped charge generation unit (CGU) of NPB/MoO3/Al/LiF as an electron injector have been developed. It is found that the electrons are generated effectively at the NPB/MoO3 interface and injected from MoO3 to the electron transporting layer via assistant electron injection layers of Al/LiF. More importantly, the performance of the devices shows insensitivity to the work function of the used cathode. Under the optimal structure of NPB(10 nm)/MoO3(5 nm)/Al(3 nm)/LiF(1 nm), the green fluorescent IOLEDs present a maximum current efficiency (CEmax) of 3.5 cd/A. Furthermore, the green phosphorescent IOLEDs based on this CGU show a turn-on voltage of 3.8 V, a CEmax of 54.6 cd/A and a maximum external quantum efficiency of 15.8%. The results suggest that the introduction of non-doped CGU in IOLEDs provides a promising strategy to integrate IOLEDs with the n-channel thin film transistors for applications in active-matrix OLEDs.

Original languageEnglish
Article number105445
JournalOrganic Electronics
Volume76
DOIs
StatePublished - Jan 2020

Keywords

  • Charge generation unit
  • Electrode independent electron injection
  • Electron injector
  • Inverted organic light emitting devices

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