Jump to main content
Jump to site search

Issue 28, 2017
Previous Article Next Article

Microwave-assisted one-pot synthesis of new ionic iridium complexes of [Ir(bzq)2(N^N)]+A type and their selected electroluminescent properties

Author affiliations

Abstract

Iridium C,N-cyclometalated complexes with an ionic structure are considered to be promising candidates for application in host/guest solid-state phosphorescent single-layer devices because the employment of such dopants offers the possibility of reducing their concentration in organic matrices as well as allows obtaining organic light emitting devices (OLEDs) with interesting emission parameters. We report herein a methodology enabling the synthesis of cyclometalated ionic iridium(III) complexes of the type [Ir(C^N)2(N^N)]+A according to a three-component one-pot strategy involving the acceleration of the reaction via microwave irradiation. The developed protocol allowed efficient synthesis of a series of new cationic iridium(III) coordination derivatives, which were isolated and spectroscopically characterized, while the structures of two of them were determined by the X-ray method. Moreover, the iridium(III) derivatives were subjected to the cyclic voltammetry studies in order to determine the energies of the HOMO and LUMO levels as well as to estimate their electrochemical properties and to predict some electronic properties. Additionally, the ONIOM calculation scheme that was used to predict HOMO–LUMO gaps for the studied Ir(III) complexes showed a good correlation between the experimental and calculated values. In order to determine the influence of the structure and nature of the ancillary ligand on the location of the maximum emission band, the photophysical properties of the synthesized iridium complexes were characterized. Finally, the selected compounds were used as emitters for the construction of polymer light emitting diodes (PLEDs) based on a poly(N-vinylcarbazole)/2-(4-tert-butylphenyl)-5-(4-biphenyl)-1,3,4-oxadiazole (PVK/PBD) matrix. The highest luminance, above 10 000 cd m−2, was recorded for the device containing only 1.0 wt% of [Ir(bzq)2(1,10-phenanthroline)]+PF6 in the PVK/PBD. The fabricated PLEDs exhibit current efficiency in the range of 1.0 to 2.2 cd A−1.

Graphical abstract: Microwave-assisted one-pot synthesis of new ionic iridium complexes of [Ir(bzq)2(N^N)]+A− type and their selected electroluminescent properties

Back to tab navigation

Supplementary files

Publication details

The article was received on 15 Apr 2017, accepted on 16 Jun 2017 and first published on 19 Jun 2017


Article type: Paper
DOI: 10.1039/C7DT01372H
Citation: Dalton Trans., 2017,46, 9210-9226
  •   Request permissions

    Microwave-assisted one-pot synthesis of new ionic iridium complexes of [Ir(bzq)2(N^N)]+A type and their selected electroluminescent properties

    B. Orwat, E. Witkowska, I. Kownacki, M.-J. Oh, M. Hoffmann, M. Kubicki, I. Grzelak, B. Marciniec, I. Glowacki, B. Luszczynska, G. Wiosna-Salyga, J. Ulanski, P. Ledwon and M. Lapkowski, Dalton Trans., 2017, 46, 9210
    DOI: 10.1039/C7DT01372H

Search articles by author

Spotlight

Advertisements