Journal
JOURNAL OF MATERIALS CHEMISTRY C
Volume 5, Issue 31, Pages 7732-7738Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7tc01375b
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Funding
- H2020 ETN SYNCHRONICS [643238]
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The study of supramolecular interactions and aggregation behaviour of functional materials is of great importance to tune and extend their spectral sensitivity and, hence, improve the opto-electronic response of related devices. In this study, we resolve spatially and spectrally the absorption and emission features of squaraine aggregates by means of confocal microscopy and absorption/photoluminescence spectroscopy. We observe that the aggregate affords both a broad absorption spectrum (centred at 1.85 eV and extending to 1.55 eV), likely originated by a dye configuration with allowed J-and H-arrangements, and a strong and relatively narrow emission in the near-infrared (NIR) part of the spectrum (centred at 1.59 eV), with a remarkable Stokes shift of 0.26 eV that is among the largest exhibited by squaraine dyes. These peculiarities would be beneficial for extending the spectral sensitivity of photovoltaic/lightemitting diodes and electrochemical cells, and extremely appealing for possible applications of these aggregates as NIR fluorescent probes in biomedical applications.
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