Near-UV to red-emitting charged bis-cyclometallated iridium(iii) complexes for light-emitting electrochemical cells

Research output: Contribution to journalArticlepeer-review

Authors

  • Florian Kessler
  • Rubén D. Costa
  • Davide Di Censo
  • Rosario Scopelliti
  • Enrique Ortí
  • Henk J. Bolink
  • Sebastian Meier
  • Wiebke Sarfert
  • Michael Grätzel
  • Md Khaja Nazeeruddin
  • Etienne Baranoff

Colleges, School and Institutes

External organisations

  • Siemens AG
  • Fundació General de la Universitat de Valencia (FGUV)
  • Friedrich Alexander Universität Erlangen-Nürnberg
  • Ecole Polytechnique Federale de Lausanne
  • Swiss Federal Institute of Technology
  • Instituto de Ciencia Molecular, Universidad de Valencia
  • Universidad de Valencia
  • Department of Chemistry and Pharmacy
  • Interdisciplinary Center for Molecular Materials (ICMM)
  • Friedrich-Alexander-Universiẗat Erlangen-N̈urnberg
  • Siemens AG
  • GTF Organic Electronics Gunther-Scharowsky

Abstract

Herein we report a series of charged iridium complexes emitting from near-UV to red using carbene-based NC: ancillary ligands. Synthesis, photophysical and electrochemical properties of this series are described in detail together with X-ray crystal structures. Density Functional Theory calculations show that the emission originates from the cyclometallated main ligand, in contrast to commonly designed charged complexes using bidentate NN ancillary ligands, where the emission originates from the ancillary NN ligand. The radiative process of this series of compounds is characterized by relatively low photoluminescence quantum yields in solution that is ascribed to non-radiative deactivation of the excited state by thermally accessible metal-centered states. Despite the poor photophysical properties of this series of complexes in solution, electroluminescent emission from the bluish-green to orange region of the visible spectrum is obtained when they are used as active compounds in light-emitting electrochemical cells. This journal is

Details

Original languageEnglish
Pages (from-to)180-191
Number of pages12
JournalDalton Transactions
Volume41
Issue number1
Publication statusPublished - 7 Jan 2012

ASJC Scopus subject areas