Managing Charge and Exciton Transporting Behavior in White Organic Light-Emitting Devices for High Power Efficiency and Superior Color Stability

Qi Wang, Iain W.H. Oswald, Xiaolong Yang, Guijiang Zhou, Huiping Jia, Qiquan Qiao, Jason Hoshikawa-Halbert, Bruce E. Gnade

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

An advanced device structure using doped blue dual emitting layers (EMLs) and an undoped orange EML is developed for achieving white organic light-emitting diodes. The optimized device using a single emitting species for both blue and orange emission shows a peak power efficiency of 60 lm W−1 and high color stability over the entire operation process due to the aligned energy levels for facilitated charge transport. Quantitative analysis of the device working mechanism is performed to provide an explanation for the high performance of the device. It is found that both the charge and exciton transporting behavior can be finely tuned between different emitting regions, and therefore the efficiency and spectrum of the device are improved systematically.

Original languageEnglish (US)
Article number1400040
JournalAdvanced Electronic Materials
Volume1
Issue number7
DOIs
StatePublished - Jul 2015
Externally publishedYes

Keywords

  • charge transport
  • organic light-emitting devices
  • phosphorescence
  • triplet exciton
  • white light

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials

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