Fig. 4: Mechanism of IRRTP at room temperature.
From: Ultraviolet irradiation-responsive dynamic ultralong organic phosphorescence in polymeric systems
a Hydrogen bonding interactions between SDP and SDP, SDP and PVA, and PVA and PVA in unirradiated SDP-based film. b Covalent bond (C–O–C) formation between PVA chains after 254 nm UV light irradiation for <45 min. c Rearrangement of hydrogen bonding interactions, and further formation of covalent bond (C–O–C) after irradiation for more than 45 min. d 1H NMR spectra of SDP-based film (1 mg/mL) in DMSO-d6 recorded after different irradiation times. e Electron paramagnetic resonance spectra and f one-dimentional scattering profiles in the qz direction of GiWAXS pattern for SDP-based film (0.3 mg/mL) recorded after different irradiation times.
