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Efficient Green-Light-Emitting Electrochemical Cells Based on Ionic Iridium Complexes with Sulfone-Containing Cyclometalating Ligands

Tordera, D. and Bünzli, A. M. and Pertegás, A. and Junquera-Hernández, J. M. and Constable, E. C. and Zampese, J. A. and Housecroft, C. E. and Ortí, E. and Bolink, H. J.. (2013) Efficient Green-Light-Emitting Electrochemical Cells Based on Ionic Iridium Complexes with Sulfone-Containing Cyclometalating Ligands. Chemistry - A European Journal, 19 (26). pp. 8597-8609.

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Official URL: http://edoc.unibas.ch/dok/A6165178

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Abstract

A new approach to obtain green-emitting iridium(III) complexes is described. The synthetic approach consists of introducing a methylsulfone electron-withdrawing substituent into a 4-phenylpyrazole cyclometalating ligand in order to stabilize the highest-occupied molecular orbital (HOMO). Six new complexes have been synthesized incorporating the conjugate base of 1-(4-(methylsulfonyl)phenyl)-1 H-pyrazole as the cyclometalating ligand. The complexes show green emission and very high photoluminescence quantum yields in both diluted and concentrated films. When used as the main active component in light-emitting electrochemical cells (LECs), green electroluminance is observed. High efficiencies and luminances are obtained at low driving voltages. This approach for green emitters is an alternative to the widely used fluorine-based substituents in the cyclometalating ligands and opens new design possibilities for the synthesis of green emitters for LECs.
Faculties and Departments:05 Faculty of Science > Departement Chemie > Chemie > Anorganische Chemie (Housecroft)
UniBasel Contributors:Housecroft, Catherine Elizabeth and Constable, Edwin Charles and Bünzli, Andreas
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:Wiley
ISSN:0947-6539
e-ISSN:1521-3765
Note:Publication type according to Uni Basel Research Database: Journal article
Identification Number:
Last Modified:19 Jun 2018 13:58
Deposited On:13 Sep 2013 07:52

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