Lookup NU author(s): Professor Andrew Benniston,
Dr Paul Waddell,
Emeritus Professor Anthony Harriman
This is the authors' accepted manuscript of an article that has been published in its final definitive form by Wiley - VCH Verlag GmbH & Co. KGaA, 2016.
For re-use rights please refer to the publisher's terms and conditions.
A compact donor–acceptor molecular dyad has been synthesized by attaching an N,N-dimethylamino fragment to a naphthalic anhydride residue. The dyad shows fluorescence from an intramolecular charge-transfer state (i.e., charge-recombination fluorescence) in solution, with the photo-physical properties being strongly dependent on the solvent polarity. Similar emission is seen for single crystals of the target compound, the molecules being aligned head-to-head, although time-resolved emission profiles display dual-exponential kinetics. A second polymorph with the head-to-tail alignment also gives rise to two lifetimes that differ somewhat from those of the first structure, which are assigned to bulk and surface-bound molecules. Growing the crystal in the presence of Rhodamine B localizes the dye around the surface. Excitation of the crystal is followed by sub-ps exciton migration along the aligned stacks, with occasional crossing to adjacent stacks and trapping at the surface. Rhodamine B present at very low levels acts as the acceptor for excitons entering the surface layer. Crystals embedded in a polyester resin form an artificial light-harvesting antenna able to sensitize an amorphous silicon solar cell.
Author(s): Al-Aqar R, Atahan A, Benniston AC, Perks T, Waddell PG, Harriman A
Publication type: Article
Publication status: Published
Journal: Chemistry: A European Journal
Print publication date: 17/10/2016
Online publication date: 06/09/2016
Acceptance date: 01/09/2016
Date deposited: 13/09/2016
ISSN (print): 0947-6539
ISSN (electronic): 1521-3765
Publisher: Wiley - VCH Verlag GmbH & Co. KGaA
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