Multi-mode Organic Light-Emitting Diode to Suppress the Viewing Angle Dependence

Chen Dong, Xiangyu Fu, Linyu Cao, Stephen Amoah, Kenan Gundogdu, Jian Li, Franky So

Research output: Contribution to journalArticlepeer-review

Abstract

A typical top-emitting organic light-emitting diode (OLED) has a strong microcavity effect because of the two reflective electrodes. The cavity effect causes a serious color shift with the viewing angles and restricts the organic layer thickness. To overcome these drawbacks, we design a multi-mode OLED structure with dual-dielectric spacer layers, which extend the cavity length by more than 10 times. This design completely eliminates the intrinsic cavity effect caused by the top and bottom boundaries and provides freedom for the organic layer thickness. We demonstrate these effects in a white multi-mode OLED using a white emitter, which shows a negligible angular chromaticity shift of Î"uv = 0.006 from 0 to 70° and a Lambertian emission profile. The simple design and the perfect angular color profiles make the multi-mode OLED structure promising in large-area displays and solid-state lighting applications.

Original languageEnglish (US)
Pages (from-to)31667-31676
Number of pages10
JournalACS Applied Materials and Interfaces
Volume12
Issue number28
DOIs
StatePublished - Jul 15 2020

Keywords

  • angular color shift
  • cavity effect
  • multiple cavity modes
  • top-emitting OLED
  • white OLED

ASJC Scopus subject areas

  • Materials Science(all)

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