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Phase-Transition-Induced Photoluminescence Change in Two Hybrid Manganese Halide Crystals
Yu-Xuan Wang1, Lin Chen1, Tong Xie1
1College of Chemistry and Chemical Engineering, Key Laboratory of Shandong Provincial Universities for Functional Molecules and Materials, Qingdao University, Qingdao, Shandong 266071, P. R. China.
Inorganic Chemistry
|October 2, 2025
Summary
Two new hybrid manganese(II) halides exhibit thermally driven, reversible yellow-to-green photoluminescence (PL) color changes. This phase-transition-induced PL shift offers insights for designing dynamic luminescence materials and anticounterfeiting applications.
Area of Science:
- Materials Science
- Chemistry
- Solid State Physics
Background:
- Photoluminescence (PL) manipulation in hybrid metal halides is crucial for advanced optical materials.
- Phase-transition-induced PL changes offer efficient PL transformation but face challenges due to complex intermolecular interactions.
Purpose of the Study:
- To synthesize and characterize new organic-inorganic hybrid manganese(II) halides.
- To investigate the mechanisms behind phase-transition-induced photoluminescence changes.
- To explore applications in multilevel information anticounterfeiting.
Main Methods:
- Synthesis of (C9H13N2)2MnCl4·0.5H2O (1) and (C9H13N2)2MnBr4 (2).
- Thermal analysis and structural characterization.
- Photoluminescence spectroscopy under varying stimuli (temperature, humidity).
Main Results:
- Compounds 1 and 2 exhibit reversible yellow-to-green PL color changes upon thermal phase transitions.
- Structural analysis reveals coordination geometry distortion and enhanced intermolecular interactions influencing the crystal field and emission.
- The materials demonstrate potential for multilevel information anticounterfeiting due to stimuli-responsive luminescence.
Conclusions:
- Established the link between intermolecular interactions, structural deformation, and phase-transition-induced PL changes.
- Provided insights for designing dynamic luminescence materials.
- Highlighted the potential of these hybrid halides for anticounterfeiting technologies.
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