Covalently linked pyrene antennas for optically dense yet aggregation-resistant light-harvesting systems

Lubna Salah, Saad Makhseed, Basma Ghazal, Ahmed Abdel nazeer, Marc K. Etherington, Carlito S. Ponseca jr., Chunyong Li, Andrew P. Monkman, Andrew Danos*, Ali Shuaib*

*Corresponding author for this work

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In this study we present a novel energy transfer material inspired by natural light-harvesting antenna arrays, zinc(II) phthalocyanine-pyrene (ZnPcPy). The ZnPcPy system facilitates energy transfer from 16 covalently linked pyrene (Py) donor chromophores to the emissive central zinc(II) phthalocyanine (ZnPc) core. Nearly 98% energy transfer efficiency is determined from the changes in emission decay rates between free MePy to covalently linked Py, supported by comparisons of photoluminescence quantum yields using different excitation wavelengths. A comparative analysis of ZnPcPy and an equivalent mixture of ZnPc and MePy demonstrates the superior light-harvesting performance of the covalently linked system, with energy transfer rates 9705 times higher in the covalently bound system. This covalent strategy allows for very high loadings of absorbing Py chromophores to be achieved while also avoiding exciton quenching that would otherwise arise, with the same strategy widely applicable to other pairs of Főrster resonance energy transfer (FRET) chromophores.
Original languageEnglish
Pages (from-to)24878-24882
Number of pages5
JournalPhysical Chemistry Chemical Physics
Issue number36
Early online date8 Sept 2023
Publication statusPublished - 28 Sept 2023

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