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Stable and efficient solid-state light-emitting electrochemical cells based on a series of hydrophobic iridium complexes

Costa, Ruben D. and Orti, Enrique and Tordera, Daniel and Pertegas, Antonio and Bolink, Henk J. and Graber, Stefan and Housecroft, Catherine E. and Sachno, Ludmila and Neuburger, Markus and Constable, Edwin C.. (2011) Stable and efficient solid-state light-emitting electrochemical cells based on a series of hydrophobic iridium complexes. Advanced Energy Materials, 1 (2). pp. 282-290.

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Official URL: http://edoc.unibas.ch/dok/A5848944

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Abstract

Light-emitting electrochemical cells (LECs) based on ionic transition-metal complexes (iTMCs) exhibiting high efficiency, short turn-on time, and long stability have recently been presented. Furthermore, LECs emitting in the full range of the visible spectrum including white light have been reported. However, all these achievements were obtained individually, not simultaneously, using in each case a different iTMC. In this work, device stability is maintained by employing intrinsically stable ionic iridium complexes, while increasing the complex and the device quantum yields for exciton-to-photon conversion. This is done by sequentially modifying the archetype ionic iridium complex [Ir(ppy)(2)(bpy)][PF(6)], where Hppy is 2-phenylpyridine and bpy is 2,2`-bipyridine, with methyl and phenyl groups on the bpy ligand. A full photophysical and theoretical description of a series of four complexes, including the archetype as a reference, is presented and their performance in LECs is characterized. Upon selecting suitable substituents, a twofold increase is obtained in the photoluminescence quantum yield in a solid film. This is reflected in a significant increase in the efficiency over time curve for LECs using this complex.
Faculties and Departments:05 Faculty of Science > Departement Chemie > Chemie > Anorganische Chemie (Constable)
05 Faculty of Science > Departement Chemie > Chemie > Anorganische Chemie (Housecroft)
UniBasel Contributors:Constable, Edwin Charles and Housecroft, Catherine Elizabeth and Neuburger, Markus
Item Type:Article, refereed
Publisher:Wiley
ISSN:1614-6832
e-ISSN:1614-6840
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:10 Apr 2017 14:27
Deposited On:14 Sep 2012 07:01

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