Role of the Bridging Group in Bis-Pyridyl Ligands: Enhancing Both the Photo- and Electroluminescent Features of Cationic (IPr)CuI Complexes

Margaux Elie, Michael D. Weber, Florent Di Meo, Fabien Sguerra, Jean François Lohier, Robert B. Pansu, Jean Luc Renaud, Matthieu Hamel, Mathieu Linares, Rubén D. Costa, Sylvain Gaillard

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)

Abstract

We report on the benefits of changing the bridging group X of bis-pyridyl ligands, that is, Py-X-Py where X is NH, CH2, C(CH3)2, or PPh, on the photo- and electroluminescent properties of a new family of luminescent cationic H-heterocyclic carbene (NHC) copper(I) complexes. A joint experimental and theoretical study demonstrates that the bridging group affects the molecular conformation from a planar-like structure (X is NH and CH2) to a boat-like structure (X is C(CH3)2 and PPh), leading to i) four-fold enhancement of the photoluminescence quantum yield (ϕem) without affecting the thermally activated delayed fluorescence mechanism, and ii) one order of magnitude reduction of the ionic conductivity (σ) of thin films. This leads to an overall enhancement of the device efficacy and luminance owing to the increased ϕem and the use of low applied driving currents.

Original languageEnglish
Pages (from-to)16328-16337
Number of pages10
JournalChemistry - A European Journal
Volume23
Issue number64
DOIs
Publication statusPublished - 2017 Nov 16

Keywords

  • copper(I) complexes
  • density functional theory
  • light-emitting electrochemical cells
  • photoluminescence
  • thermally activated delayed fluorescence

ASJC Scopus subject areas

  • Catalysis
  • Organic Chemistry

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