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Archetype Cationic Iridium Complexes and Their Use in Solid-State Light-Emitting Electrochemical Cells

Costa, Rubén D. and Ortí, Enrique and Bolink, Henk J. and Graber, Stefan and Schaffner, Silvia and Neuburger, Markus and Housecroft, Catherine E. and Constable, Edwin C.. (2009) Archetype Cationic Iridium Complexes and Their Use in Solid-State Light-Emitting Electrochemical Cells. Advanced Functional Materials, 19 (21). pp. 3456-3463.

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Official URL: http://edoc.unibas.ch/dok/A5251878

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Abstract

The archetype ionic transition-metal complexes (iTMCs) [Ir(ppy)2(bpy)][PF6] and [Ir(ppy)2(phen)][PF6], where Hppy = 2-phenylpyridine, bpy = 2,2'-bipyridine, and phen = 1,10-phenanthroline, are used as the primary active components in light-emitting electrochemical cells (LECs). Solution and solid-state photophysical properties are reported for both complexes and are interpreted with the help of density functional theory calculations. LEC devices based on these archetype complexes exhibit long turn-on times (70 and 160 h, respectively) and low external quantum efficiencies (~ 2%) when the complex is used as a pure film. The long turn-on times are attributed to the low mobility of the counterions. The performance of the devices dramatically improves when small amounts of ionic liquids (ILs) are added to the Ir-iTMC: the turn-on time improves drastically (from hours to minutes) and the device current and power efficiency increase by almost one order of magnitude. However, the improvement of the turn-on time is unfortunately accompanied by a decrease in the stability of the device from 700 h to a few hours. After a careful study of the Ir-iTMC:IL molar ratios, an optimum between turn-on time and stability is found at a ratio of 4:1. The performance of the optimized devices using these rather simple complexes is among the best reported to date. This holds great promise for devices that use specially-designed iTMCs and demonstrates the prospect for LECs as low-cost light sources.
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 Neuburger, Markus and Housecroft, Catherine Elizabeth and Graber, Stefan
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
Identification Number:
Last Modified:10 Apr 2017 14:48
Deposited On:22 Mar 2012 14:06

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