Source: School of Chemistry
Written by: School of Chemistry
Edited by: Wang Dongmei

Long persistent luminescence (LPL) materials have unique photophysical mechanism to store light radiation energy for subsequent release. However, in comparison to the common UV source, white-light (WL) and near-infrared (NIR) excited LPL is scarce. Recently, Prof. Mei Pan’s group at School of Chemistry, Sun Yat-sen University reported a metal-organic supramolecular box based on a D-π-A type ligand. Due to the integrated one-photon absorption (OPA) and two-photon absorption (TPA) attributes of the ligand, heavy atom effect of the metal-center, as well as π-stacking and J-aggregation states in the supramolecular assembly, LPL can be triggered by all wavebands from UV, WL to NIR region for the first time. This novel designed supramolecular kit to afford LPL via both OPA and TPA pathways provides potential applications in anti-counterfeiting, camouflaging, decorating, displaying, and so on.
 

Design concepts and application for long persistent luminescence by OPA/TPA dual-pathways
 

The result has been recently published on Angew. Chem. Int. Ed. 2019, 58, doi: 10.1002/anie.201812708.

Link to the paper: https://onlinelibrary.wiley.com/doi/full/10.1002/anie.201812708