Multi-Color Switchable Luminescence in Organic-Inorganic Metal Halides via Local Polyhedron Regulation Under Light
Wei Yang1,2, Peipei Dang1,3, Dongjie Liu1
1State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, China.
Researchers designed new organic-inorganic metal halides (OIMHs) with tunable multi-color luminescence. Structural changes influence emission, enabling applications in anti-counterfeiting and information encryption.
Area of Science:
- Materials Science
- Solid-State Chemistry
- Photophysics
Background:
- Organic-inorganic metal halides (OIMHs) exhibit multi-color switchable luminescence, crucial for sensing and optoelectronics.
- Challenges exist in regulating OIMH luminescence due to complex soft lattice structures, hindering practical applications.
Purpose of the Study:
- To design novel 0D OIMHs with tunable luminescence properties.
- To establish design rules for luminescence regulation in low-dimensional OIMHs.
- To explore potential applications in anti-counterfeiting and information encryption.
Main Methods:
- Synthesis of a series of 0D OIMHs (e.g., PA3SbCl6, PA6InCl9).
- Sb3+ doping to achieve tunable self-trapped excitons (STEs) emission.
- Investigation of structure-property correlations (distortion, bandgap, emission, quantum yield).
- Co-doping with Sb3+/Bi3+ to create multi-emission centers.
Main Results:
- Tunable STE emission from 606 to 678 nm achieved via Sb3+ doping in 0D structures.
- Greater local inorganic polyhedron distortion correlated with red-shifted emission.
- Increased separation distance between polyhedra enhanced quantum yield by reducing non-radiative transitions.
- Multi-color switching (green/red, blue/green/red) demonstrated in Sb3+/Bi3+-doped PMA4InCl7.
Conclusions:
- Established correlations between structural distortion, bandgap, and luminescence characteristics in 0D Sb3+-doped OIMHs.
- Demonstrated the potential of using ns2 ions for multi-color switchable luminescence in low-dimensional OIMHs.
- Highlighted application potential in optical anti-counterfeiting and information encryption through tailored luminescence.
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