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Issue 38, 2010
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An inconvenient influence of iridium(III) isomer on OLED efficiency

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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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The article was received on 03 May 2010, accepted on 05 Jul 2010 and first published on 13 Aug 2010

Article type: Paper
DOI: 10.1039/C0DT00414F
Citation: 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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