Role of the bridging group in bis-pyridyl ligands: enhancing both the photo- and electroluminescent features of cationic (IPr)Cu I complexes - ANR - Agence nationale de la recherche Accéder directement au contenu
Article Dans Une Revue Chemistry - A European Journal Année : 2017

Role of the bridging group in bis-pyridyl ligands: enhancing both the photo- and electroluminescent features of cationic (IPr)Cu I complexes

Résumé

We report on the benefits of changing the bridging group X of bis-pyridyl ligands, that is, Py-X-Py where X is NH, CH2, C(CH3)2, or PPh, on the photo- and electroluminescent properties of a new family of luminescent cationic H-heterocyclic carbene (NHC) copper(I) complexes. A joint experimental and theoretical study demonstrates that the bridging group affects the molecular conformation from a planar-like structure (X is NH and CH2) to a boat-like structure (X is C(CH3)2 and PPh), leading to i) four-fold enhancement of the photoluminescence quantum yield (ϕem) without affecting the thermally activated delayed fluorescence mechanism, and ii) one order of magnitude reduction of the ionic conductivity (σ) of thin films. This leads to an overall enhancement of the device efficacy and luminance owing to the increased ϕem and the use of low applied driving currents.
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Dates et versions

hal-01633172 , version 1 (12-01-2023)

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Margaux Elie, Michael D. Weber, Florent Di Meo, Fabien Sguerra, Jean-François Lohier, et al.. Role of the bridging group in bis-pyridyl ligands: enhancing both the photo- and electroluminescent features of cationic (IPr)Cu I complexes. Chemistry - A European Journal, 2017, 23 (64), pp.16328-16337. ⟨10.1002/chem.201703270⟩. ⟨hal-01633172⟩
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