Triplet-triplet annihilation photon-upconversion in hydrophilic media with biorelevant cholesteryl triplet energy acceptors

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http://hdl.handle.net/10138/336865

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Yun , Y J , Isokuortti , J , Laaksonen , T , Durandin , N & Ayitou , A J L 2021 , ' Triplet-triplet annihilation photon-upconversion in hydrophilic media with biorelevant cholesteryl triplet energy acceptors ' , Journal of Photochemistry and Photobiology A: Chemistry , vol. 418 , 113412 . https://doi.org/10.1016/j.jphotochem.2021.113412

Title: Triplet-triplet annihilation photon-upconversion in hydrophilic media with biorelevant cholesteryl triplet energy acceptors
Author: Yun, Young Ju; Isokuortti, Jussi; Laaksonen, Timo; Durandin, Nikita; Ayitou, A. Jean Luc
Contributor organization: Division of Pharmaceutical Biosciences
University of Helsinki
Pharmaceutical Nanotechnology
Date: 2021-09-01
Language: eng
Number of pages: 6
Belongs to series: Journal of Photochemistry and Photobiology A: Chemistry
ISSN: 1010-6030
DOI: https://doi.org/10.1016/j.jphotochem.2021.113412
URI: http://hdl.handle.net/10138/336865
Abstract: We report two new biorelevant cholesteryl-based triplet energy acceptors, derivatives of DPA or 9,10-diphenylanthracene (C–DPA and C2–DPA). Using two different triplet sensitizers: QDN (ET ≈ 1.67 eV in PEG200) and PdTPP (ET ≈ 1.78 eV in PEG200), we were able to achieve both endothermic (with QDN) and exothermic (with PdTPP) triplet sensitization of DPA, C–DPA and C2–DPA in hydrophilic PEG200 media. While the maximum rate of triplet energy transfer (TET) was achieved with PdTPP and DPA (kTET = 4.7 × 107 M−1 s−1), for the cholesteryl-based acceptors, we found that the kinetic of the TET process was dependent upon the concentration of the acceptor. For PdTPP/C–DPA pair, the rate of the dynamic triplet energy quenching was kTET = 1.9 × 107 M−1 s−1; however, at higher concentrations of the quencher, the system reached a stationary state due to formation of self-assembled sub-domains of C–DPA that likely slowed the TET process. It was also found that this aggregation of C–DPA in PEG200 led to a 3.5 folds increase in the Ith compared to 133 mW cm2 for DPA. Subsequently, we estimated the ΦUC for these donor/acceptor pairs: QDN/DPA, PdTPP/DPA, and PdTPP/C–DPA. With respect to the estimated threshold intensity (Ith), we found that the quantum yields of TTA-UC were 2 ≤ QYUC≤12%.
Description: Funding Information: The Academy of Finland (Grant No. 316893) Funding Information: YJY is thankful for the support from the Kilpatrick Graduate Fellowship and the Starr Fieldhouse Research Fellowship Programs at Illinois Tech. The authors thank the National Science Foundation for the generous support to this work under a CAREER grant N° 1753012 Awarded to AJA. JI, ND and TL also thank the Academy of Finland for the generous support to this work under grant N° 316893. Publisher Copyright: © 2021 Elsevier B.V.
Subject: DELAYED FLUORESCENCE
116 Chemical sciences
Peer reviewed: Yes
Rights: unspecified
Usage restriction: closedAccess
Self-archived version: submittedVersion


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