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Multi-Dimensional Color Tunable Long Persistent Luminescence in Metal Halide-Based CPs Through Precise Manipulation
Dan Wang1, Jia-Yu Zhu1, Xin-Qi Chen1
1Key Laboratory of Chemical Additives for China National Light Industry, College of Chemistry and Chemical Engineering, Shaanxi University of Science and Technology, Xi'an, 710021, P. R. China.
Small (Weinheim an Der Bergstrasse, Germany)
|January 6, 2025
Summary
Researchers developed new coordination polymers for long persistent luminescence (LPL). These materials exhibit tunable red light emission and extended phosphorescence lifetimes, paving the way for advanced anti-counterfeiting applications.
Area of Science:
- Materials Science
- Chemistry
- Luminescence
Background:
- Regulating long persistent luminescence (LPL) is crucial for advanced material applications.
- Coordination polymers (CPs) offer tunable photophysical properties.
Purpose of the Study:
- To synthesize and characterize novel coordination polymers (CPs) with varying substituents for controlled LPL.
- To investigate the relationship between molecular structure, electronic properties, and luminescence characteristics.
Main Methods:
- Fabrication of CPs using 1,10-phenanthroline derivatives with different substituents (H, CH3, Cl, Br).
- Crystallographic analysis to determine structural arrangements.
- Photoluminescence spectroscopy to study emission properties and lifetimes.
Main Results:
- Synthesized four CPs (SUST-Z1-Z4) with alternating cadmium halide chains and phenanthroline ligands.
- Observed heavy atom effects and intermolecular interactions (halogen bonding, π-π stacking) promoting triplet excitons.
- Achieved tunable aggregated-state phosphorescence lifetimes from 6.84 ms to 91.10 ms and emission colors from orange to red.
- SUST-Z2 showed the longest RTP and red LPL due to the CH3 substituent's weak electron-withdrawing ability.
- Demonstrated dynamic color-tunable LPL (green/orange to yellow/red) based on excitation, temperature, and time.
Conclusions:
- The substituent's electronic properties significantly influence CP structure, packing, and LPL.
- The developed CPs exhibit promising long-lasting and color-tunable LPL.
- These CPs are suitable for developing sophisticated anti-counterfeiting strategies.
