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 spect

SUBMITTER: Dou Y 

PROVIDER: S-EPMC8190285 | biostudies-literature | 2021 Jun

REPOSITORIES: biostudies-literature