Stochastic model analysis of luminescence switching in hybrid systems of CdSe/CdS quantum dots-spiropyran molecular photoswitches.

Authors

Sho Shishido, Moe Yamamoto, Daichi Eguchi, Naoto Tamai

Published in

Physical chemistry chemical physics : PCCP. Sep 11, 2025. Epub Sep 11, 2025.

Abstract

Hybrid systems (HSs) of quantum dots (QDs) and molecular photoswitches exhibit luminescence switching of QDs based on energy transfer and have garnered attention for their potential applications in sensors and optical memories. In HSs, the chemical composition, such as the number of attached ligands, is inherently distributed, posing challenges for extracting the energy transfer process from the QDs to a single acceptor molecule. The stochastic model, assuming a Poisson distribution for the number of acceptors, proves to be an effective approach for extracting the process. In this study, we synthesized HSs comprising CdSe/CdS QDs and spiropyran molecular photoswitches. The luminescence switching of QDs via energy transfer from QDs to merocyanine formed by the UV irradiation of spiropyran was analyzed using a stochastic model. The estimated donor-acceptor distances obtained from the model showed significant concordance with other experimental findings, highlighting the utility of the model. In addition, trap states were reversibly formed on the surface of QDs via a photochromic reaction. One of the advantages of this model is its ability to analyze elementary processes and provide insights into microscopic structural details, such as the mean number of acceptors and trap states.

PMID:
40931701
Bibliographic data and abstract were imported from PubMed on 11 Sep 2025.

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