Lévy defects in matrix-immobilized J aggregates: tracing intra-and intersegmental exciton relaxation

Larry Lüer*, Sai Kiran Rajendran, Tatjana Stoll, Lucia Ganzer, Julien Rehault, David M. Coles, David Lidzey, Tersilla Virgili, Giulio Cerullo

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)
2 Downloads (Pure)

Abstract

One-dimensional J aggregates present narrow and intense absorption and emission spectra that are interesting for photonics applications. Matrix immobilization of the aggregates, as required for most device architectures, has recently been shown to induce a non-Gaussian (Lévy type) defect distribution with heavy tails, expected to influence exciton relaxation. Here we perform two-dimensional electronic spectroscopy (2DES) in one-dimensional J aggregates of the cyanine dye TDBC, immobilized in a gel matrix, and we quantitatively model 2DES maps by nonlinear optimization coupled to quantum mechanical calculations of the transient excitonic response. We find that immobilization causes strong non-Gaussian off-diagonal disorder, leading to a segmentation of the chains. Intersegmental exciton transfer is found to proceed on the picosecond time scale, causing a long-lasting excitation memory. These findings can be used to inform the design of optoelectronic devices based on J aggregates as they allow for control of exciton properties by disorder management.
Original languageEnglish
Pages (from-to)547-552
Number of pages6
JournalJournal of Physical Chemistry Letters
Volume8
Issue number3
Early online date3 Jan 2017
DOIs
Publication statusPublished - 2 Feb 2017

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