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Article Dans Une Revue Dyes and Pigments Année : 2021

Phosphine-based push-pull AIE fluorophores: Synthesis, photophysical properties, and TD-DFT studies

Résumé

Abstract When periodically packing the intramolecular donor-acceptor structures to form ferroelectric-like lattice identified by second harmonic generation, our CD49 molecular crystal shows long-wavelength persistent photoluminescence peaked at 542 nm with the lifetime of 0.43 s, in addition to the short-wavelength prompt photoluminescence peaked at 363 nm with the lifetime of 0.45 ns. Interestingly, the long-wavelength persistent photoluminescence demonstrates magnetic field effects, showing as crystalline intermolecular charge-transfer excitons with singlet spin characteristics formed within ferroelectric-like lattice based on internal minority/majority carrier-balancing mechanism activated by isomer doping effects towards increasing electron-hole pairing probability. Our photoinduced Raman spectroscopy reveals the unusual slow relaxation of photoexcited lattice vibrations, indicating slow phonon effects occurring in ferroelectric-like lattice. Here, we show that crystalline intermolecular charge-transfer excitons are interacted with ferroelectric-like lattice, leading to exciton-lattice coupling within periodically packed intramolecular donor-acceptor structures to evolve ultralong-lived crystalline light-emitting states through slow phonon effects in ferroelectric light-emitting organic crystal.
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Dates et versions

hal-03821202 , version 1 (13-06-2023)

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Paternité - Pas d'utilisation commerciale

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Maxime Rémond, Pauline Colinet, Erwan Jeanneau, Tangui Le Bahers, Chantal Andraud, et al.. Phosphine-based push-pull AIE fluorophores: Synthesis, photophysical properties, and TD-DFT studies. Dyes and Pigments, 2021, 193 (1), pp.109485. ⟨10.1016/j.dyepig.2021.109485⟩. ⟨hal-03821202⟩
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