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.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jun 09, 2021
- Source ID
- 10.1038/s41467-021-23791-9
Entities
People
- A-J Attias
- Bin Hu
- Bogdan Dryzhakov
- Catherine Demangeat
- Eunkyoung Kim
- Hengxing Xu
- Kwang-sup Lee
- Miaosheng Wang
- Tangui Le Bahers
- Yixuan Dou
Organizations
- Air Force Office of Scientific Research
- National Science Foundation