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Efficient and Long-Living Light-Emitting Electrochemical Cells

Costa, Ruben D. and Ortí, Enrique and Bolink, Henk and Graber, Stefan and Housecroft, Catherine E. and Constable, Edwin C.. (2010) Efficient and Long-Living Light-Emitting Electrochemical Cells. Advanced Functional Materials, 20. pp. 1511-1520.

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Official URL: http://edoc.unibas.ch/dok/A5841478

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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. Density functional theory calculations indicate that the three complexes have the desired π–π intramolecular interactions between the pendant phenyl ring of the bpy ligand and the phenyl ring of one of the ppy ligands in the ground and the excited states. The photoluminescence quantum efficiency of concentrated films of the complexes improves with the increasing size of the bulky groups indicating that the adopted strategy for improving the efficiency is successful. 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.
Faculties and Departments:05 Faculty of Science > Departement Chemie > Chemie > Anorganische Chemie (Housecroft)
UniBasel Contributors:Housecroft, Catherine Elizabeth and Graber, Stefan and Constable, Edwin Charles
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:Wiley
ISSN:1616-301X
e-ISSN:1616-3028
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:10 Apr 2017 14:34
Deposited On:14 Sep 2012 06:55

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