Coupled oscillators for tuning fluorescence properties of squaraine dyes

Journal of the American Chemical Society
Christoph LambertMarco Holzapfel

Abstract

Combining a squaraine (S) and a BODIPY (B) chromophore in a heterodimer (SB) and two heterotrimers (BSB and SBS) by alkyne bridges leads to the formation of coupled oscillators whose fluorescence properties are superior compared to the parent squaraine chromophore. The lowest energy absorption and emission properties of these superchromophores are mainly governed by the squaraine part and are shifted by more than 1000 cm(-1) to the red by excitonic interaction between the squaraine and the BODIPY dye. Employing polarization-dependent transient absorption and fluorescence upconversion measurements, we could prove that the lowest energy absorption in SB and BSB is caused by a single excitonic state but by two for SBS. Despite the spectral red-shift of their lowest absorption band, the fluorescence quantum yields increase for SB and BSB compared to the parent squaraine chromophore SQA. This is caused by intensity borrowing from the BODIPY states, which increases the squared transition moments of the lowest energy band dramatically by 29% for SB and 63% for BSB compared to SQA. Thereby, exciton coupling leads to a substantial enhancement of fluorescence quantum yield by 26% for SB and by 46% for BSB and shifts the emission from the...Continue Reading

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Citations

Aug 12, 2016·ACS Applied Materials & Interfaces·Xiao-Qiang WangXian-Zheng Zhang
Jun 6, 2017·The Journal of Physical Chemistry. a·Yuichi KitagawaYasuchika Hasegawa
Jun 27, 2017·The Journal of Organic Chemistry·Carlotta FigliolaAlison Thompson
Dec 25, 2015·Physical Chemistry Chemical Physics : PCCP·Harald CeymannChristoph Lambert
Jun 7, 2016·Physical Chemistry Chemical Physics : PCCP·Harald CeymannChristoph Lambert
Apr 2, 2019·Physical Chemistry Chemical Physics : PCCP·Nina AuerhammerChristoph Lambert
May 12, 2016·Advanced Materials·David J HarkinHenning Sirringhaus
Mar 20, 2021·The Journal of Physical Chemistry. a·Christoph LambertRoland Mitric
Sep 28, 2017·Journal of the American Chemical Society·Lukas J PatalagDaniel B Werz
May 29, 2015·Journal of the American Chemical Society·Christoph LambertTobias Brixner
May 6, 2017·The Journal of Organic Chemistry·Yanbing ZhangJared H Delcamp
Aug 25, 2020·The Journal of Organic Chemistry·Ishanka RajapakshaColleen N Scott
Sep 4, 2019·The Journal of Organic Chemistry·Chathuranga S L RathnamalalaColleen N Scott

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