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Bright and stable light-emitting electrochemical cells based on an intramolecularly π-stacked, 2-naphthyl-substituted iridium complex

Schneider, G. E. and Pertegás, A. and Constable, E. C. and Housecroft, C. E. and Hostettler, N. and Morris, C. D. and Zampese, J. A. and Junquera-Hernández, J. M. and Ortí, E. and Sessolo, M. and Bolink, H. J.. (2014) Bright and stable light-emitting electrochemical cells based on an intramolecularly π-stacked, 2-naphthyl-substituted iridium complex. Journal of materials chemistry C, 2 (34). pp. 7047-7055.

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Abstract

The synthesis and characterization of a new cationic bis-cyclometallated iridium(III) complex and its use in solid-state light-emitting electrochemical cells (LECs) are described. The complex [Ir(ppy)2(Naphbpy)][PF6], where Hppy = 2-phenylpyridine and Naphbpy = 6-(2-naphthyl)-2,2′-bipyridine, incorporates a pendant 2-naphthyl unit that π-stacks face-to-face with the adjacent ppy− ligand and acts as a peripheral bulky group. The complex presents a structureless emission centred around 595–600 nm both in solution and in thin film with relatively low photoluminescence quantum yields compared with analogous systems. Density functional theory calculations support the charge transfer character of the emitting triplet state and rationalize the low quantum yields in terms of a ligand-centred triplet localized on the 2-naphthyl unit that lies close in energy to the emitting state. LECs incorporating the [Ir(ppy)2(Naphbpy)][PF6] complex as the electroluminescent material are driven using a pulsed current operation mode and show high luminance, exceeding 300 cd m−2, and exceptional stabilities.
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:Housecroft, Catherine Elizabeth and Constable, Edwin Charles and Schneider, Gabriel and Morris, Collin and Hostettler, Niklaus and Zampese, Jennifer Ann
Item Type:Article, refereed
Bibsysno:Link to catalogue
Publisher:Royal Society of Chemistry
ISSN:2050-7526
Note:Publication type according to Uni Basel Research Database: Journal article
Language:English
Identification Number:
Last Modified:31 Dec 2015 10:56
Deposited On:06 Feb 2015 09:58

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