Role of the Bridging Group in Bis-Pyridyl Ligands: Enhancing Both the Photo- and Electroluminescent Features of Cationic (IPr)CuI Complexes

Margaux Elie; Michael D. Weber; Florent Di Meo; Fabien Sguerra; Jean François Lohier; Robert B. Pansu; Jean Luc Renaud; Matthieu Hamel; Mathieu Linares; Rubén D. Costa; Sylvain Gaillard

doi:10.1002/chem.201703270

Role of the Bridging Group in Bis-Pyridyl Ligands: Enhancing Both the Photo- and Electroluminescent Features of Cationic (IPr)Cu^I Complexes

Margaux Elie, Michael D. Weber, Florent Di Meo, Fabien Sguerra, Jean François Lohier, Robert B. Pansu, Jean Luc Renaud, Matthieu Hamel, Mathieu Linares^*, Rubén D. Costa, Sylvain Gaillard

^*Corresponding author for this work

Graduate School of Advanced Science and Engineering

Research output: Contribution to journal › Article › peer-review

34 Citations (Scopus)

Abstract

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 (ϕ_em) 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 ϕ_em and the use of low applied driving currents.

Original language	English
Pages (from-to)	16328-16337
Number of pages	10
Journal	Chemistry - A European Journal
Volume	23
Issue number	64
DOIs	https://doi.org/10.1002/chem.201703270
Publication status	Published - 2017 Nov 16

Keywords

copper(I) complexes
density functional theory
light-emitting electrochemical cells
photoluminescence
thermally activated delayed fluorescence

ASJC Scopus subject areas

Catalysis
Organic Chemistry

Access to Document

10.1002/chem.201703270

Cite this

Elie, M., Weber, M. D., Di Meo, F., Sguerra, F., Lohier, J. F., Pansu, R. B., Renaud, J. L., Hamel, M., Linares, M., Costa, R. D., & Gaillard, S. (2017). 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, 23(64), 16328-16337. https://doi.org/10.1002/chem.201703270

Elie, M, Weber, MD, Di Meo, F, Sguerra, F, Lohier, JF, Pansu, RB, Renaud, JL, Hamel, M, Linares, M, Costa, RD & Gaillard, S 2017, '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, vol. 23, no. 64, pp. 16328-16337. https://doi.org/10.1002/chem.201703270

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abstract = "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.",

keywords = "copper(I) complexes, density functional theory, light-emitting electrochemical cells, photoluminescence, thermally activated delayed fluorescence",

author = "Margaux Elie and Weber, {Michael D.} and {Di Meo}, Florent and Fabien Sguerra and Lohier, {Jean Fran{\c c}ois} and Pansu, {Robert B.} and Renaud, {Jean Luc} and Matthieu Hamel and Mathieu Linares and Costa, {Rub{\'e}n D.} and Sylvain Gaillard",

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AU - Pansu, Robert B.

AU - Renaud, Jean Luc

AU - Hamel, Matthieu

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AU - Costa, Rubén D.

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N2 - 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.

AB - 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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