Fluorescence quantum yields of dye aggregates: a showcase example based on self-assembled perylene bisimide dimers

Physical Chemistry Chemical Physics : PCCP
Franziska FennelFrank Würthner

Abstract

Constituting an intermediate state of matter between molecules and solid state materials, dye aggregates can give important insights into functional properties. Despite the importance of fluorescence for many applications, it turns out that the conventional methods for quantum yield determination are not applicable to dye aggregates and so far no method has been introduced for the accurate determination of the fluorescence quantum yields of dye aggregates. Here we suggest two measurement routines for the quantum yield determination of strongly absorbing dye aggregates. Both methods provide the quantum yield of the aggregated species without the necessity of reaching a fully aggregated state, which is particularly important for the most common case imparted by the low association constants of π-π-stacking interactions. The routines are experimentally validated with two perylene bisimide dyes whose self-assembly is driven by the concerted interplay of hydrogen bonding and π-π-stacking interactions, leading to structurally well defined co-facially stacked dimers at intermediate concentrations and a further growth into larger H-aggregates at a higher concentration. Compared to other H-aggregates relatively high fluorescence quantum...Continue Reading

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Citations

Jan 11, 2020·ChemistryOpen·Rebecca RennerFrank Würthner
Jul 15, 2020·Angewandte Chemie·Frank Würthner
Jul 12, 2019·Beilstein Journal of Organic Chemistry·Xin ShenZhenhui Qi
Dec 24, 2018·Langmuir : the ACS Journal of Surfaces and Colloids·Zongxia GuoZhibo Li
Jul 12, 2018·Journal of the American Chemical Society·Christina KaufmannFrank Würthner

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