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Issue 31, 2017
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Near-infrared emitting single squaraine dye aggregates with large Stokes shifts

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Abstract

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 optoelectronic 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/light-emitting diodes and electrochemical cells, and extremely appealing for possible applications of these aggregates as NIR fluorescent probes in biomedical applications.

Graphical abstract: Near-infrared emitting single squaraine dye aggregates with large Stokes shifts

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Submitted
31 Mar 2017
Accepted
19 Jul 2017
First published
21 Jul 2017

J. Mater. Chem. C, 2017,5, 7732-7738
Article type
Communication

Near-infrared emitting single squaraine dye aggregates with large Stokes shifts

G. M. Paternò, L. Moretti, A. J. Barker, C. D'Andrea, A. Luzio, N. Barbero, S. Galliano, C. Barolo, G. Lanzani and F. Scotognella, J. Mater. Chem. C, 2017, 5, 7732
DOI: 10.1039/C7TC01375B

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