Stable and efficient light-emitting electrochemical cells

Rubén D. Costa, Antonio Pertegás, Daniel Tordera, Martijn Lenes, Enrique Ortí, Henk J. Bolink, Stefan Graber, Edwin Constable, Catherine E. Housecroft

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Three new heteroleptic iridium complexes that combine two approaches, one leading to a high stability and the other yielding a high luminescence efficiency, are presented. All complexes contain a phenyl group at the 6-position of the neutral bpy ligand, which holds an additional, increasingly bulky substituent on the 4-position. The phenyl group allows for intramolecular π-π stacking, which renders the complex more stable and yields long-living light-emitting electrochemical cells (LECs). The additional substituent increases the intersite distance between the cations in the film, reducing the quenching of the excitons, and should improve the efficiency of the LECs. Indeed, LEC devices employing these complexes as the primary active component show shorter turn-on times, higher efficiencies and luminances, and, surprisingly, also demonstrate longer device stabilities.

Original languageEnglish
Title of host publicationNanotechnology 2010
Subtitle of host publicationElectronics, Devices, Fabrication, MEMS, Fluidics and Computational - Technical Proceedings of the 2010 NSTI Nanotechnology Conference and Expo, NSTI-Nanotech 2010
Pages49-52
Number of pages4
Publication statusPublished - 2010
Externally publishedYes
EventNanotechnology 2010: Electronics, Devices, Fabrication, MEMS, Fluidics and Computational - 2010 NSTI Nanotechnology Conference and Expo, NSTI-Nanotech 2010 - Anaheim, CA, United States
Duration: 2010 Jun 212010 Jun 24

Publication series

NameNanotechnology 2010: Electronics, Devices, Fabrication, MEMS, Fluidics and Computational - Technical Proceedings of the 2010 NSTI Nanotechnology Conference and Expo, NSTI-Nanotech 2010
Volume2

Conference

ConferenceNanotechnology 2010: Electronics, Devices, Fabrication, MEMS, Fluidics and Computational - 2010 NSTI Nanotechnology Conference and Expo, NSTI-Nanotech 2010
CountryUnited States
CityAnaheim, CA
Period10/6/2110/6/24

Keywords

  • Bulky substituents
  • High efficiency
  • Ionic transition-metal complexes
  • Iridium complexes
  • Light-emitting electrochemical cells

ASJC Scopus subject areas

  • Hardware and Architecture
  • Electrical and Electronic Engineering

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