An efficient dual-emissive-layer white organic light emitting-diode: Insight into device working mechanism and origin of color-shift

Qi Wang, Dongge Ma, Junqiao Ding, Lixiang Wang, Qiquan Qiao, Huiping Jia, Bruce E. Gnade, Jason Hoshikawa-Halbert

Research output: Contribution to journalArticlepeer-review

Abstract

By using a single host for both blue and orange phosphorescent dopants, a simple and efficient white organic light emitting-diode is reported. The dual-emissive-layer white device achieves a peak external quantum efficiency of 16.9 ± 0.9% and power efficiency of 44.1 ± 2.3 lm/W without out-coupling enhancement. Analysis of the device working mechanism determines that the blue dopant molecules can form a bridge to facilitate electron transport into the adjacent orange emitting-layer. The orange emission originates from both the direct electron trapping by the orange dopant and incomplete blue-orange energy transfer mechanisms. The origin of the voltage-dependent color shift of the device is quantitatively determined according to the working mechanism. Possible solution to reducing the color-shift is also provided based on the calculation and analytical results.

Original languageEnglish (US)
Pages (from-to)157-162
Number of pages6
JournalOrganic Electronics
Volume19
DOIs
StatePublished - Apr 2015
Externally publishedYes

Keywords

  • Charge transport
  • Color-shift
  • Phosphorescence
  • White organic light-emitting diode

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry
  • Electrical and Electronic Engineering

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