期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 126, 期 18, 页码 7922-7932出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.1c10221
关键词
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资金
- state program of scientific research of the Republic of Belarus Photonics and Electronics for Innovation [20211268, 20210913]
- state program of scientific research of the Republic of Belarus Convergence [20211236]
- reserve foundation of the president of the Republic of Belarus in 2021
- European Union's Horizon 2020 research and innovation program (the Marie Sklodowska-Curie grant) [101007430]
- Marie Curie Actions (MSCA) [101007430] Funding Source: Marie Curie Actions (MSCA)
This study investigates the steady-state spectral properties, morphology, photoelectrochemical response, and excited-state dynamics of H*-aggregates for the first time. The deactivation of electronic excitations in H*-aggregates follows two paths under 400 nm pumping, while under 800 nm pumping, they are promoted to the bottom of the exciton band. For J-aggregates, the ground-state bleaching follows biexponential decay with faster deactivation due to greater exciton delocalization.
H*-aggregates are a rarely observed type of molecular aggregates, with many of their properties yet to be investigated. The indotricarbocyanine dye under study is the first known compound able to produce both H*- and J-aggregates. Steady-state spectral properties, morphology, photoelectrochemical response, and excited-state dynamics of the H*-aggregates are investigated for the first time. Under 400 nm pumping, the deactivation of electronic excitations in the H*-aggregates follows two paths involving the top and bottom of the exciton band. This is consistent with the presence of a fast 3 ps and a slow 33 ps component in the decay trace of the ground-state bleaching. Under 800 nm pumping, the H*-aggregates are promoted to the bottom of the exciton band. Consequently, only the slow component is present in the decay trace of the ground-state bleaching. For the J-aggregates, the ground-state bleaching follows biexponential decay with the time constants of 1 and 20 ps under both 400 and 800 nm pumping. The relaxation involves only the bottom of the exciton band. The faster deactivation of electronic excitations in the J-aggregates is probably due to greater exciton delocalization: 9 molecules in the J-aggregates versus 4 molecules in the H*-aggregates. The obtained results can be used to create photonic devices containing the H*-aggregates.
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