| Autor: |
Yoon, Jun Ho, Park, Jeong-Min, Lee, Jae Moon, Kim, Hong Mo, Choi, Woo Jin, Lee, Hyun Kyu, Kim, Suhyeon, Kim, Wan Soo, Kim, Min Sung, Kim, Yoo Sang, Lee, Dong Jun, Noh, Yoona, Oh, Juwon, Kim, Jae-Hyuk, Kim, Jae Pil |
| Zdroj: |
Journal of Materials Chemistry C; 7/14/2024, Vol. 12 Issue 26, p9760-9772, 13p |
| Abstrakt: |
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. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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