Issue 13, 2016

Colour-tunable asymmetric cyclometalated Pt(ii) complexes and STM-assisted stability assessment of ancillary ligands for OLEDs

Abstract

We combined an asymmetric cyclometalated C^N^N Pt(II) complex with three different classes of monodentate ancillary ligands, namely a bulky phosphine, a tilted pyridine, and either a tilted or a coplanar isocyanide. The controlled planarization of the coordination environment yields green, orange or red phosphors. Electronic structure calculations using DFT reveal the excimeric intermolecular interactions in the excited triplet state, resulting in tunable photophysical properties. Finally, we assess the suitability of the ancillary ligands for optoelectronic applications by investigating the molecular integrity upon sublimation with the aid of scanning tunneling microscopy (STM). The ancillary ligand controls the surface-induced chiral self-assembly of the molecules on metallic substrates, as well as the availability of loose coordination sites. The concordance between the photoluminescence spectra and electroluminescence profiles for solution-processed and vapour-deposited devices confirm the predictions attained by STM regarding molecular integrity and processability.

Graphical abstract: Colour-tunable asymmetric cyclometalated Pt(ii) complexes and STM-assisted stability assessment of ancillary ligands for OLEDs

Supplementary files

Article information

Article type
Paper
Submitted
08 Jan 2016
Accepted
03 Mar 2016
First published
04 Mar 2016
This article is Open Access
Creative Commons BY-NC license

J. Mater. Chem. C, 2016,4, 2560-2565

Colour-tunable asymmetric cyclometalated Pt(II) complexes and STM-assisted stability assessment of ancillary ligands for OLEDs

J. Sanning, L. Stegemann, P. R. Ewen, C. Schwermann, C. G. Daniliuc, D. Zhang, N. Lin, L. Duan, D. Wegner, N. L. Doltsinis and C. A. Strassert, J. Mater. Chem. C, 2016, 4, 2560 DOI: 10.1039/C6TC00093B

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