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Development of cyclometallated iridium(III) complexes for light-emitting electrochemical cells

Housecroft, Catherine E. and Constable, Edwin C.. (2017) Development of cyclometallated iridium(III) complexes for light-emitting electrochemical cells. In: Light-Emitting Electrochemical Cells: Concepts, Advances and Challenges,. Heidelberg, pp. 167-202.

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Abstract

This chapter gives an overview of the development of cyclometallated iridium(III) complexes for application in light-emitting electrochemical cells (LECs) and highlights the ligand-design strategies employed to enhance device stability, operating efficiency and (critically for LECs in which the ion mobilities are typically low) turn-on times. Typical iridium-containing ionic transtion metal complexes (Ir-iTMCs) belong to the family of [Ir(C^N) 2 (N^N)] + complexes in which H(C^N) is a cyclometallating ligand and N^N is a diimine or related chelating ligand. The partitioning of Ir/C^N vs N^N character in the HOMO and LUMO of a [Ir(C^N) 2 (N^N)] + complex, respectively, lends itself to a ligand-functionalization driven method of varying the band-gap allowing emission-colour tuning. An important development in addressing device stability has been the design of ligands that can protect the iridium(III) centre through intra-cation π-stacking interactions, and progress in this area is discussed in detail. The need for deep-blue emitters has been addressed by introducing fluoro-substituents into the cyclometallating domain; however this can lead to lower stability of the LECs and alternative means of shifting the emission into the blue are discussed. Finally, we discuss how a move away from singly-charged, cationic Ir-iTMCs can be used to shorten the turn-on times of LECs
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
Item Type:Book Section
Book Section Subtype:Further Contribution in a Book
Publisher:Springer
ISBN:978-3-319-58612-0
e-ISBN:978-3-319-58613-7
Note:Publication type according to Uni Basel Research Database: Book item
Language:English
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Last Modified:13 Apr 2018 07:02
Deposited On:21 Aug 2017 07:44

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