Dendritic Carbene Metal Carbazole Complexes as Photo-Emitters for Fully Solution-Processed OLEDs

Romanov, Alexander, Yang, Le, Jones, Saul, Di, Dawei, Morley, Olivia, Drummond, Bluebell, Reponen, Antti, Linnolahti, Mikko, Credgington, Dan and Bochmann, Manfred (2019) Dendritic Carbene Metal Carbazole Complexes as Photo-Emitters for Fully Solution-Processed OLEDs. Chemistry of Materials, 31 (10). pp. 3613-3623. ISSN 0897-4756

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Abstract

Light-emitting carbene-metal amide (CMA) complexes bearing first and second generation carbazole dendron ligands are reported, (AdL)M(Gn), (M = Cu and Au; Gn carbazole dendrimer generation, where n = 1 and 2; AdL = adamantyl-substituted cyclic (alkyl)amino)carbene). The thermal stability of the complexes increases with each dendrimer generation. Cyclic voltammetry indicates that the HOMO/LUMO energy levels are largely unaffected by the size of the dendron, while first reduction and oxidation processes show a quasi-reversible character. The gold complexes in toluene at room temperature show photoluminescent quantum yields (PLQYs) of up to 51.5% for the first and 78% for the second generation. Varied temperature transient photoluminescence decay is consistent with a thermally activated process indicating a delayed fluorescence-type emission mechanism. Neat films show excited state lifetimes composed of prompt and dominant sub-microsecond delayed components, with radiative constants of up to 106 s−1. Solution-processed organic light-emitting diodes (OLEDs) for first generation copper (1) and gold (2) dendrimers (AdL)M(G1) have been fabricated with external quantum efficiencies (EQEs) of 5.5% for copper and 10.3% for gold at practical brightness.

Item Type: Article
Faculty \ School: Faculty of Science > School of Chemistry
Depositing User: LivePure Connector
Date Deposited: 14 May 2019 13:30
Last Modified: 19 Sep 2020 23:41
URI: https://ueaeprints.uea.ac.uk/id/eprint/70988
DOI: 10.1021/acs.chemmater.8b05112

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