Dinuclear platinum( ii ) complexes emitting through TADF: new ligand design to minimise aggregation and the S 1 –T 1 energy gap

Pander, Piotr; Dikova, Yana M.; Puttock, Emma V.; Williams, J. A. Gareth

Abstract

Dinuclear platinum(ii) complexes of a new, ditopic, bis-tridentate NCN–NCN-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.

Citation

Pander, P., Dikova, Y. M., Puttock, E. V., & Williams, J. A. G. (2024). Dinuclear platinum( ii ) complexes emitting through TADF: new ligand design to minimise aggregation and the S 1 –T 1 energy gap. Inorganic Chemistry Frontiers, 7191-7668. https://doi.org/10.1039/d4qi02069c

• Journal Article Type: Article
• Acceptance Date: Sep 13, 2024
• Online Publication Date: Sep 18, 2024
• Publication Date: Nov 7, 2024
• Deposit Date: Oct 1, 2024
• Publicly Available Date: Oct 3, 2024
• Journal: Inorganic Chemistry Frontiers
• Print ISSN: 2052-1553
• Electronic ISSN: 2052-1553
• Publisher: Royal Society of Chemistry
• Peer Reviewed: Peer Reviewed
• Issue: 21
• Pages: 7191-7668
• DOI: https://doi.org/10.1039/d4qi02069c
• Public URL: https://durham-repository.worktribe.com/output/2892994