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 ORCID: (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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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: 21 Oct 2022 22:38
DOI: 10.1021/acs.chemmater.8b05112

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