Spin-orbital coupling and slow phonon effects enabled persistent photoluminescence in organic crystal under isomer doping - Sorbonne Université
Journal Articles Nature Communications Year : 2021

Spin-orbital coupling and slow phonon effects enabled persistent photoluminescence in organic crystal under isomer doping

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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Origin Publication funded by an institution

Dates and versions

hal-03258720 , version 1 (11-06-2021)

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Cite

Yixuan Dou, Catherine Demangeat, Miaosheng Wang, Hengxing Xu, Bogdan Dryzhakov, et al.. Spin-orbital coupling and slow phonon effects enabled persistent photoluminescence in organic crystal under isomer doping. Nature Communications, 2021, 12, pp.3485. ⟨10.1038/s41467-021-23791-9⟩. ⟨hal-03258720⟩
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