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Remote modification of bidentate phosphane ligands controlling the photonic properties in their complexes: enhanced performance of [Cu(RN-xantphos)(N^N)][PF6] complexes in light-emitting electrochemical cells
JournalArticle (Originalarbeit in einer wissenschaftlichen Zeitschrift)
 
ID 4529818
Author(s) Arnosti, Nina; Brunner, Fabian; Susic, Isidora; Keller, Sarah; Junquera-Hernández, José M.; Prescimone, Alessandro; Bolink, Henk J.; Sessolo, Michele; Orti, Enrique; Housecroft, Catherine E.; Constable, Edwin C.
Author(s) at UniBasel Housecroft, Catherine
Constable, Edwin Charles
Arnosti, Nina
Brunner, Fabian
Prescimone, Alessandro
Keller, Sarah
Year 2020
Title Remote modification of bidentate phosphane ligands controlling the photonic properties in their complexes: enhanced performance of [Cu(RN-xantphos)(N^N)][PF6] complexes in light-emitting electrochemical cells
Journal Advanced Optical Materials
Volume 8
Pages / Article-Number 1901689
Abstract A series of copper(I) complexes of the type [Cu(HN-xantphos)(N^N)][PF6] and [Cu(BnN-xantphos)(N^N)][PF6], in which N^N = bpy, Mebpy and Me2bpy, HN-xantphos = 4,6-bis(diphenylphosphanyl)-10H-phenoxazine and BnN-xantphos = 10-benzyl-4,6-bis(diphenylphosphanyl)-10H-phenoxazine is described. The single crystal structures of [Cu(HN-xantphos)(Mebpy)][PF6] and [Cu(BnN-xantphos)(Me2bpy)][PF6] confirm the presence of N^N and P^P chelating ligands with the copper(I) atoms in distorted coordination environments. Solution electrochemical and photophysical properties of the BnN-xantphos-containing compounds (for which the highest-occupied molecular orbital is located on the phenoxazine moiety) are reported. The first oxidation of [Cu(BnN-xantphos)(N^N)][PF6] occurs on the BnN-xantphos ligand. Time-dependent density functional theory (TD-DFT) calculations have been used to analyze the solution absorption spectra of the [Cu(BnN-xantphos)(N^N)][PF6] compounds. In the solid-state, the compounds show photoluminescence in the range 518-555 nm for [Cu(HN-xantphos)(N^N)][PF6] and 520-575 nm for [Cu(BnN-xantphos)(N^N)][PF6] with a blue-shift on going from bpy to Mebpy to Me2bpy. [Cu(BnN-xantphos)(Me2bpy)][PF6] exhibits a solid-state photoluminescence quantum yield of 55% with an excited state lifetime of 17.4 µs. Bright light-emitting electrochemical cells were obtained using this complex, and we show that the electroluminescence quantum yield can be enhanced by using less conducting hole injection layers
Publisher Wiley
ISSN/ISBN 2195-1071
edoc-URL https://edoc.unibas.ch/75842/
Full Text on edoc Available
Digital Object Identifier DOI 10.1002/adom.201901689
 
   

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