Dynamic Ultralong Organic Phosphorescence by Photoactivation

Abstract

Smart materials with ultralong phosphorescence are rarely investigated and reported. Herein we report on a series of molecules with unique dynamic ultralong organic phosphorescence (UOP) features, enabled by manipulating intermolecular interactions through UV light irradiation. Our experimental data reveal that prolonged irradiation of single‐component organic phosphors of PCzT, BCzT, and FCzT under ambient conditions can activate UOP with emission lifetimes spanning from 1.8 to 1330 ms. These phosphors can also be deactivated back to their original states with short‐lived phosphorescence by UV irradiation for 3 h at room temperature or through thermal treatment. Additionally, the dynamic UOP was applied successfully for a visual anti‐counterfeiting application. These findings may provide unique insight into dynamic molecular motion for optical processing and expand the scope of smart‐response materials for broader applications.

Multiple Luminescence Responses towards Mechanical Stimulus and Photo‐Induction: The Key Role of the Stuck Packing Mode and Tunable Intermolecular Interactions

“…The increased intermolecular interactions with closer distances between dimers were demonstrated as the main reason for the photo‐induced RTP effect, which can be further confirmed by other organic luminogens with similar phenomena . However, until now, the reports of organic photo‐induced RTP luminogens remain limited in number, partially owing to a lack of reliable molecular design guidance and unclear inherent mechanisms.…”

Stimuli‐Responsive Circularly Polarized Organic Ultralong Room Temperature Phosphorescence

“…Specifically, the chiral chain can successfully introduce the chiral character to the aromatic group for CP‐RTP and effectively manipulate the molecular arrangement and packing mode in aggregated structures for enhancing the solid‐state chiral emission . Moreover, the flexible chain that can be driven by external stimuli will dynamically tune the molecular stacking under photon irradiation for more effective aggregation coupling in solid states, which is beneficial to stabilize the highly active excited triplet excitons for high‐performance CP‐OURTP.…”

Proton‐Activated Amorphous Room‐Temperature Phosphorescence for Humidity Sensing and High‐Level Data Encryption

“…So far, these strategies have gained remarkable progress in the development of amorphous RTP materials. However, many other factors such as molecular packing style, molecular configuration, molecular planarity can also affect the properties of the triplet excited state greatly . Unfortunately, the acquisition of efficient amorphous RTP remains a great challenge through variation in the aforementioned factors.…”