Organic light-emitting diodes employing efficient reverse intersystem crossing for triplet-to-singlet state conversion

Kenichi Goushi, Kou Yoshida, Keigo Sato, Chihaya Adachi

Research output: Contribution to journalArticle

779 Citations (Scopus)

Abstract

Light emission from organic light-emitting diodes that make use of fluorescent materials have an internal quantum efficiency that is typically limited to no more than 25% due to the creation of non-radiative triplet excited states. Here, we report the use of electron-donating and electron-accepting molecules that allow a very high reverse intersystem crossing of 86.5% between non-radiative triplet and radiative singlet excited states and thus a means of achieving enhanced electroluminescence. Organic light-emitting diodes made using m-MTDATA as the donor material and 3TPYMB as the acceptor material demonstrate that external quantum efficiencies as high as 5.4% can be achieved, and we believe that the approach will offer even higher values in the future as a result of careful material selection.

Original languageEnglish
Pages (from-to)253-258
Number of pages6
JournalNature Photonics
Volume6
Issue number4
DOIs
Publication statusPublished - Apr 1 2012

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics

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