Issue 26, 2024

Photophysical properties and excited-state dynamics of donor–acceptor–heavy-atom molecules and their application in triplet–triplet annihilation upconversion

Abstract

In the field of triplet–triplet annihilation upconversion (TTA-UC), the design of an optimized UC system with a high quantum yield at a low excitation power density is a challenging issue. To achieve this goal, it is essential to improve the triplet quantum yields (ΦT) and the UC quantum yields (ΦUC) of the triplet photosensitizers. In this study, we synthesized a novel series of donor–acceptor–heavy-atom (D–A–H) molecules where we have focused on pyrene, BODIPY, and halogen atoms (Cl, Br, and I) as D, A, and H moieties, respectively. The TTA-UC properties of the D–A–H molecules were examined, and their electrochemical properties and excited-state dynamics were investigated. The highest singlet oxygen and UC quantum yields were estimated for PY-BDP-2I (PY = pyrene and BDP = BODIPY) with the values of 0.93 and 4.84%, respectively. In addition, the threshold intensities (Ith) of PY-BDP-2Cl, PY-BDP-2Br, and PY-BDP-2I (112, 27, and 42 mW cm−2, respectively) were lower than that of PY-BDP (406 mW cm−2). In UC quantum yields, the iodine-containing samples (PY-BDP-2I and BEN-BDP-2I) show higher quantum yields than other compounds, which demonstrates that the introduction of iodine into the D–A–H photosensitizer system is an effective strategy for improving the TTA-UC performance.

Graphical abstract: Photophysical properties and excited-state dynamics of donor–acceptor–heavy-atom molecules and their application in triplet–triplet annihilation upconversion

Supplementary files

Article information

Article type
Paper
Submitted
05 févr. 2024
Accepted
21 mai 2024
First published
11 juin 2024

J. Mater. Chem. C, 2024,12, 9760-9772

Photophysical properties and excited-state dynamics of donor–acceptor–heavy-atom molecules and their application in triplet–triplet annihilation upconversion

J. H. Yoon, J. Park, J. M. Lee, H. M. Kim, W. J. Choi, H. K. Lee, S. Kim, W. S. Kim, M. S. Kim, Y. S. Kim, D. J. Lee, Y. Noh, J. Oh, J. Kim and J. P. Kim, J. Mater. Chem. C, 2024, 12, 9760 DOI: 10.1039/D4TC00491D

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