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Ligand tuneable, red‐emitting iridium(III) complexes for efficient triplet‐triplet annihilation upconversion performance

Ligand tuneable, red‐emitting iridium(III) complexes for efficient triplet‐triplet annihilation upconversion performance
Ligand tuneable, red‐emitting iridium(III) complexes for efficient triplet‐triplet annihilation upconversion performance
A series of substituted 2‐phenylquinoxaline ligands have been explored to finely tune the visible emission properties of a corresponding set of cationic, cyclometalated iridium(III) complexes. The electronic and redox properties of the complexes were investigated using experimental (including time‐resolved luminescence and transient absorption spectroscopy) and theoretical methods. The complexes display absorption and phosphorescent emission in the visible region attributed to MLCT transitions. The different substitution patterns of the ligands induce variations in these parameters. TD‐DFT studies support these assignments and show that there is likely to be a strong spin‐forbidden contribution to the visible absorption bands at 500‐600 nm. Calculation also reliably predict the magnitude and trends in triplet emitting wavelengths for the series of complexes. The complexes were assessed as potential sensitizers in triplet‐triplet annihilation upconversion experiments using 9,10‐diphenylanthracene as the acceptor, with the methylated variants performing especially well with impressive upconversion quantum yields up to 39.3 %.
Organometallica, iridium, luminescence, upconversion
0947-6539
Pope, Simon
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Stonelake, Thomas
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Phillips, Kaitlin
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Coles, Simon J.
3116f58b-c30c-48cf-bdd5-397d1c1fecf8
Horton, Peter
154c8930-bfc3-495b-ad4a-8a278d5da3a5
Keane, Shannon
8815bed5-51d5-4fd1-8b9d-50886b0e0b66
Stokes, Emily
dfedd75d-6564-4e16-a936-c5a896093e1e
Fallis, Ian A.
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Beames, Joseph
22a8f4d0-7052-4564-995a-b047a807bb05
Zhao, Jianzhang
08415724-251c-475a-97d7-bb21408eb959
Chen, Kepeng
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Hou, Yuqi
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Hallett, Andrew J.
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O'Kell, Sean
302d5bcb-d82e-493d-a509-f32f7f8767cb
Pope, Simon
a9a004a6-4510-49eb-9b6d-f967618155ef
Stonelake, Thomas
a9d1f85b-87c8-4827-9857-7d07ee051d23
Phillips, Kaitlin
97ac9dc8-957d-40e0-9396-fb9ab472ef36
Coles, Simon J.
3116f58b-c30c-48cf-bdd5-397d1c1fecf8
Horton, Peter
154c8930-bfc3-495b-ad4a-8a278d5da3a5
Keane, Shannon
8815bed5-51d5-4fd1-8b9d-50886b0e0b66
Stokes, Emily
dfedd75d-6564-4e16-a936-c5a896093e1e
Fallis, Ian A.
6f14a47a-a4f7-405d-94eb-33fe818a21c5
Beames, Joseph
22a8f4d0-7052-4564-995a-b047a807bb05
Zhao, Jianzhang
08415724-251c-475a-97d7-bb21408eb959
Chen, Kepeng
1ed9a7ea-25bc-4905-a656-bb9cd650db07
Hou, Yuqi
3b003e79-97b4-4abf-8008-a841c96e469c
Hallett, Andrew J.
36cc4f6a-74d4-4894-8a65-8dd9d7803593
O'Kell, Sean
302d5bcb-d82e-493d-a509-f32f7f8767cb

Pope, Simon, Stonelake, Thomas, Phillips, Kaitlin, Coles, Simon J., Horton, Peter, Keane, Shannon, Stokes, Emily, Fallis, Ian A., Beames, Joseph, Zhao, Jianzhang, Chen, Kepeng, Hou, Yuqi, Hallett, Andrew J. and O'Kell, Sean (2018) Ligand tuneable, red‐emitting iridium(III) complexes for efficient triplet‐triplet annihilation upconversion performance. Chemistry - A European Journal. (doi:10.1002/chem.201801007).

Record type: Article

Abstract

A series of substituted 2‐phenylquinoxaline ligands have been explored to finely tune the visible emission properties of a corresponding set of cationic, cyclometalated iridium(III) complexes. The electronic and redox properties of the complexes were investigated using experimental (including time‐resolved luminescence and transient absorption spectroscopy) and theoretical methods. The complexes display absorption and phosphorescent emission in the visible region attributed to MLCT transitions. The different substitution patterns of the ligands induce variations in these parameters. TD‐DFT studies support these assignments and show that there is likely to be a strong spin‐forbidden contribution to the visible absorption bands at 500‐600 nm. Calculation also reliably predict the magnitude and trends in triplet emitting wavelengths for the series of complexes. The complexes were assessed as potential sensitizers in triplet‐triplet annihilation upconversion experiments using 9,10‐diphenylanthracene as the acceptor, with the methylated variants performing especially well with impressive upconversion quantum yields up to 39.3 %.

Text Pope_et_al-2018-Chemistry_-_A_European_Journal (1) - Accepted Manuscript
Restricted to Repository staff only until 18 April 2019.
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Accepted/In Press date: 18 April 2018
e-pub ahead of print date: 18 April 2018
Keywords: Organometallica, iridium, luminescence, upconversion

Identifiers

Local EPrints ID: 421002
URI: https://eprints.soton.ac.uk/id/eprint/421002
ISSN: 0947-6539
PURE UUID: 0a6682f6-25b0-40e2-ba97-e2963dfb31fc
ORCID for Simon J. Coles: ORCID iD orcid.org/0000-0001-8414-9272
ORCID for Peter Horton: ORCID iD orcid.org/0000-0001-8886-2016

Catalogue record

Date deposited: 21 May 2018 16:30
Last modified: 09 Aug 2018 00:34

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Contributors

Author: Simon Pope
Author: Thomas Stonelake
Author: Kaitlin Phillips
Author: Simon J. Coles ORCID iD
Author: Peter Horton ORCID iD
Author: Shannon Keane
Author: Emily Stokes
Author: Ian A. Fallis
Author: Joseph Beames
Author: Jianzhang Zhao
Author: Kepeng Chen
Author: Yuqi Hou
Author: Andrew J. Hallett
Author: Sean O'Kell

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