Source: School of Chemistry
Written by: Prof. Mei Pan’s Group
Edited by: Tan Rongyu, Wang Dongmei

Materials with tunable long persistent luminescence (LPL) properties have wide applications in security signs, anti-counterfeiting, data encrypting and other fields, which have attracted great attention. Herein, a series of metal-organic coordination polymers displaying color-tunable LPL were synthesized by the selfassembly of HTzPTpy ligand with different cadmium halides (X = Cl, Br, and I). In solid state, their LPL emission colors can be tuned by the time evolution, as well as excitation and temperature variation, realizing multimode dynamic color tuning from green to yellow or green to red, and representing the first example in single component coordination polymer materials. Single-crystal X-ray diffraction analysis and theoretical calculations reveal that the modification of LPL is due to the balanced action from single molecule and aggregate triplet excited states aroused by external heavy-atom effect. The results suggest that the rational introduction of different halide anions into coordination polymers to realize multi-color LPL is promising for different domain applications, including imaging, anti-counterfeiting and security protection.

The research result has recently been published in Angew. Chem. Int. Ed. (2020, 10.1002/anie.2020128317).


Link to the paper: https://onlinelibrary.wiley.com/doi/full/10.1002/anie.201905186