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

Etienne Baranoff*, Henk J. Bolink, Filippo De Angelis, Simona Fantacci, Davide Di Censo, Karim Djellab, Michael Grätzel, Md Khaja Nazeeruddin, Etienne Baranoff

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

32 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)8914-8918
Number of pages5
JournalDalton Transactions
Issue number38
Publication statusPublished - 14 Oct 2010

ASJC Scopus subject areas

  • Inorganic Chemistry


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