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Chiral iridium(III) complexes in light-emitting electrochemical cells: exploring the impact of stereochemistry on the photophysical properties and device performances

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Diego Rota Martir, Cristina Momblona, Antonio Pertegás, David Bradford Cordes, Alexandra Martha Zoya Slawin, Henk J. Bolink, Eli Zysman-Colman

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Despite hundreds of cationic bis-cyclometalated iridium(III) complexes having been explored as emitters for light-emitting electrochemical cells (LEECs), uniformly their composition has been in the form of a racemic mixture of Λ and Δ enantiomers. The investigation of LEECs using enantiopure iridium(III) emitters, however, remains unprecedented. Herein, we report the preparation, the crystal structures and the optoelectronic properties of two families of cyclometalated iridium(III) complexes of the form of [(C^N)2Ir(dtBubpy)]PF6 (where dtBubpy is 4,4'-di-tert-butyl-2,2'-bipyridine) in both their racemic and enantiopure configurations. LEEC devices using Λ and Δ enantiomers as well as the racemic mixture of both families have been prepared and the device performances were tested. Importantly, different solid-state photophysical properties exist between enantiopure and racemic emitters, which are also reflected in the device performances.


Original languageEnglish
Pages (from-to)33907-33915
Number of pages9
JournalACS Applied Materials & Interfaces
Issue number49
Early online date16 Nov 2016
Publication statusPublished - 14 Dec 2016

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