Document Type

Article

Publication Date

2024

DOI

10.1039/D3RA07539G

Publication Title

RSC Advances

Volume

14

Issue

1

Pages

424-432

Abstract

We investigate switching of photoluminescence (PL) from PbS quantum dots (QDs) crosslinked with two different types of photochromic diarylethene molecules, 4,4'-(1-cyclopentene-1,2-diyl)bis[5-methyl-2-thiophenecarboxylic acid] (1H) and 4,4'-(1-perfluorocyclopentene-1,2-diyl)bis[5-methyl-2-thiophenecarboxylic acid] (2F). Our results show that the QDs crosslinked with the hydrogenated molecule (1H) exhibit a greater amount of switching in photoluminescence intensity compared to QDs crosslinked with the fluorinated molecule (2F). With a combination of differential pulse voltammetry and density functional theory, we attribute the different amount of PL switching to the different energy levels between 1H and 2F molecules which result in different potential barrier heights across adjacent QDs. Our findings provide a deeper understanding of how the energy levels of bridge molecules influence charge tunneling and PL switching performance in QD systems and offer deeper insights for the future design and development of QD based photo-switches.

Rights

© 2024 The Authors.

This article is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported (CC BY-NC 3.0) Licence.

Original Publication Citation

Sarabamoun, E. S., Bietsch, J. M., Aryal, P., Reid, A. G., Curran, M., Johnson, G., Tsai, E. H. R., Machan, C. W., Wang, G., & Choi, J. J. (2024). Photoluminescence switching in quantum dots connected with fluorinated and hydrogenated photochromic molecules. RSC Advances, 14(1), 424-432. https://doi.org/10.1039/d3ra07539g

ORCID

0009-0007-8137-1370 (Aryal), 0000-0001-7473-0004 (Wang)

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