Sensitive and Repeatable Photoinduced Luminescent Radicals from A Simple Organic Crystal

Photoinduced organic radicals are important for chemical and physical processes of organic materials, which are extensively investigated and applied in organic synthesis, photoelectronic devices and biotechnology. However, there are rare reports of the luminescence for these photoinduced radicals, especially in the condensed state. Herein, an unexpected and interesting luminescent radical is described, which can be rapidly and reversibly generated from a simple organic crystal by gentle light irradiation in air. It was revealed that the twist and asymmetric conformation of isolated molecule in its crystal with only weak C-H...pi intermolecular interactions, which led to the generation of such photoinduced luminescent radicals. In addition, dual-channel photosensitive device with rapid response and well repeatability can be obtained based on the thin film of this organic crystal, showing both photoswitching on luminescence and conducting.

Automated summary

Photoinduced organic radicals play a crucial role in various chemical and physical processes, however, the luminescent properties of these radicals are rarely reported. A unique luminescent radical has been discovered in a simple organic crystal, generated through gentle light irradiation, showcasing rapid and reversible generation due to the twist and asymmetric conformation of the isolated molecules with weak intermolecular interactions. Additionally, a dual-channel photosensitive device with rapid response and repeatability can be fabricated based on thin film of this organic crystal, enabling photoswitching on luminescence and conducting properties.