Issue 21, 2024

Dinuclear platinum(ii) complexes emitting through TADF: new ligand design to minimise aggregation and the S1–T1 energy gap

Abstract

Dinuclear platinum(II) complexes of a new, ditopic, bis-tridentate NCNNCN-coordinating ligand, appended with four mesityl groups, are reported. The high radiative rate constants and correspondingly efficient luminescence of the complexes involves thermally activated delayed fluorescence (TADF), thanks to a near-zero energy gap between the S1 and T1 states. The mesityl groups also serve to hinder the aggregation that was detrimental to electroluminescence efficiency in previous studies, allowing a ∼4-fold increase in OLED efficiency to be achieved (i.e. from 2.3% previously to 10% in this work). Oxidation of one of the Pt(II) complexes led to a dinuclear Pt(IV) complex of unprecedented structure.

Graphical abstract: Dinuclear platinum(ii) complexes emitting through TADF: new ligand design to minimise aggregation and the S1–T1 energy gap

Supplementary files

Article information

Article type
Research Article
Submitted
14 Aug 2024
Accepted
13 Sep 2024
First published
18 Sep 2024
This article is Open Access
Creative Commons BY license

Inorg. Chem. Front., 2024,11, 7545-7551

Dinuclear platinum(II) complexes emitting through TADF: new ligand design to minimise aggregation and the S1–T1 energy gap

P. Pander, Y. M. Dikova, E. V. Puttock and J. A. G. Williams, Inorg. Chem. Front., 2024, 11, 7545 DOI: 10.1039/D4QI02069C

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