Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 60, Issue 5, Pages 2526-2533Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202012831
Keywords
cadmium; color tuning; coordination polymers; halides; long persistent luminescence (LPL)
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Funding
- NSFC [21771197, 21821003, 21720102007, 21890380]
- Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program [2017BT01C161]
- FRF for the Central Universities
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A series of metal-organic coordination polymers displaying color-tunable long persistent luminescence (LPL) were successfully synthesized in this study, achieving multi-mode dynamic color tuning. Single-crystal X-ray diffraction analysis and theoretical calculations revealed that the modification of LPL was due to the balanced action from single molecule and aggregate triplet excited states caused by an external heavy-atom effect.
Materials with tunable long persistent luminescence (LPL) properties have wide applications in security signs, anti-counterfeiting, data encrypting, and other fields. However, the majority of reported tunable LPL materials are pure organic molecules or polymers. Herein, a series of metal-organic coordination polymers displaying color-tunable LPL were synthesized by the self-assembly of HTzPTpy ligand with different cadmium halides (X=Cl, Br, and I). In the solid state, their LPL emission colors can be tuned by the time-evolution, as well as excitation and temperature variation, realizing multi-mode dynamic color tuning from green to yellow or green to red, and are the first such examples 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 caused by an external heavy-atom effect. The results show that the rational introduction of different halide anions into coordination polymers can realize multi-color LPL.
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