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Tuning the Formation of J and H Aggregates in Diketopyrrolopyrrole Materials

preprint
submitted on 24.09.2020 and posted on 24.09.2020 by Aritrajit Gupta, Ashish Sarkalya, Ramesh Ganduri, Jayashree Nagesh, Satish Patil
The aggregation of molecules in devices plays a central role in determining their functional
properties. In the aggregated state, pi conjugated chromophores can exhibit enhanced emission
in comparison to their dilute solution. Here we synthesize and characterize a diketopyrrolopyrrole
(DPP) based donor-acceptor molecule in terms of its optical properties in
solution and thin film. Temperature and concentration dependent photoluminescence studies
reveal the presence of both H and J aggregates in thin film, which is corroborated by
computational investigations of the coulombic coupling in the crystal structure of the DPP
derivative. We find that the type of aggregate formed is extremely sensitive to the variation
in the shearing angle between the monomers in the crystal structure geometry.

Funding

Swarnajayanti Fellowship

Ramanujan Fellowship

UKRI Global Challenge Research Fund Project

History

Email Address of Submitting Author

jayashreen@iisc.ac.in

Institution

Indian Institute of Science

Country

India

ORCID For Submitting Author

0000-0002-0415-8329

Declaration of Conflict of Interest

None

Exports