Efficient Outcoupling of Organic Light-Emitting Devices Using a Light-Scattering Dielectric Layer

Jongchan Kim, Yue Qu, Caleb Coburn, Stephen R. Forrest

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)

Abstract

It has long been a challenge to develop a highly efficient outcoupling method for organic light-emitting diodes that is independent of wavelength and viewing angle, as well as being nonintrusive into the device structure. Here, we demonstrate a transparent, top emitting structure integrated with a high index of refraction waveguide layer and a rough, dielectric diffuse reflector that eliminates plasmonic, waveguide, and substrate modes without introducing wavelength and viewing-angle dependence. The simple outcoupling structure increases the external quantum efficiency from 15 ± 2% to 37 ± 4% compared to an analogous device with a metal mirror, corresponding to a 2.5-fold enhancement without requiring the use of additional outcoupling structures such as microlens arrays or index matching layers to extract substrate modes. The method is potentially suitable for low-cost, solid-state lighting due to its simplicity and high outcoupling efficiency.

Original languageEnglish
Pages (from-to)3315-3321
Number of pages7
JournalACS Photonics
Volume5
Issue number8
DOIs
Publication statusPublished - 2018 Aug 15

Bibliographical note

Publisher Copyright:
© 2018 American Chemical Society.

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Biotechnology
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering

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