Issue 38, 2010
From the journal:

Dalton Transactions

An inconvenient influence of iridium(iii) isomer on OLED efficiency†

Etienne Baranoff,*a   Henk J. Bolink,*b   Filippo De Angelis,*c   Simona Fantacci,cd   Davide Di Censo,a   Karim Djellab,e   Michael Grätzela  and  Md. Khaja Nazeeruddin*a  

* Corresponding authors

a Laboratory of Photonics and Interfaces, Institute of Chemical Sciences and Engineering, School of Basic Sciences, Swiss Federal Institute of Technology, Station 6, Lausanne, Switzerland
E-mail: etienne.baranoff@epfl.ch, mdkhaja.nazeeruddin@epfl.ch

b Instituto de Ciencia Molecular, Universidad de Valencia, P.O. Box 22085, Valencia, Spain
E-mail: henk.bolink@uv.es

c Istituto CNR di Scienze e Tecnologie Molecolari (ISTM-CNR), c/o Dipartimento di Chimica, Università di Perugia, Perugia, Italy
E-mail: filippo@thch.unipg.it

d Italian Institute of Technology (IIT), Center for Biomolecular Nanotechnologies, Via Barsanti, Arnesano, Lecce, Italy

e Université de Picardie Jules Verne, Plate-forme de Microscopie, 33 rue Saint-Leu, Amiens, France

Abstract

The recently reported heteroleptic cyclometallated iridium(III) complex [Ir(2-phenylpyridine)2(2-carboxy-4-dimethylaminopyridine)] N984 and its isomer N984b have been studied more in detail. While photo- and electrochemical properties are very similar, DFT/TDDFT calculations show that the two isomers have different HOMO orbital characteristics. As a consequence, solution processed OLEDs made using a mixture of N984 and isomer N984b similar to vacuum processed devices show that the isomer has a dramatic detrimental effect on the performances of the device. In addition, commonly used thermogravimetric analysis is not suitable for showing the isomerization process. The isomer could impact performances of vacuum processed OLEDs using heteroleptic cyclometallated iridium(III) complexes as dopant.

Graphical abstract: An inconvenient influence of iridium(iii) isomer on OLED efficiency

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Article information

DOI
https://doi.org/10.1039/C0DT00414F
Article type
Paper
Submitted
03 May 2010
Accepted
05 Jul 2010
First published
13 Aug 2010

Dalton Trans., 2010,39, 8914-8918

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An inconvenient influence of iridium(III) isomer on OLED efficiency

E. Baranoff, H. J. Bolink, F. De Angelis, S. Fantacci, D. Di Censo, K. Djellab, M. Grätzel and Md. K. Nazeeruddin, Dalton Trans., 2010, 39, 8914 DOI: 10.1039/C0DT00414F

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