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Solvent-Mediated Structural Modulation for Excited-State Relaxation in In-Based Hybrid Halides
Haonan Wu1, Jiawei Lin2, Zhixiong Yao1
1The Beijing Municipal Key Laboratory of New Energy Materials and Technologies, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing100083, P. R. China.
Inorganic Chemistry
|July 21, 2026
Summary
Solvent choice in synthesizing organic-inorganic metal halides (OIMHs) with 2-[(methylamino)methyl]pyridine tunes their structure and optical properties. This strategy enables control over prompt and long-lived emissions without needing other metals.
Area of Science:
- Materials Science
- Inorganic Chemistry
- Photophysics
Background:
- Organic-inorganic metal halides (OIMHs) are tunable materials for optoelectronic applications.
- Structural design is key to controlling excited-state processes in OIMHs.
- Developing strategies to tune OIMH emission properties is crucial.
Purpose of the Study:
- To synthesize novel Indium-based OIMHs using a specific organic component.
- To investigate the effect of crystallization solvents on the structure and optical properties of OIMHs.
- To establish a solvent-mediated strategy for tuning emission characteristics.
Main Methods:
- Solvent-controlled crystallization of four Indium-based OIMHs using 2-[(methylamino)methyl]pyridine.
- Structural characterization through X-ray diffraction (implied).
- Photoluminescence spectroscopy and theoretical calculations to analyze emission properties.
Main Results:
- Synthesis of four distinct In-based OIMHs by varying crystallization solvents.
- Solvent modulation affects ligand protonation, metal coordination, and halide connectivity.
- Emissions arise from halide-to-organic charge-transfer states, influenced by local structure and intermolecular interactions.
- Chloride-based OIMHs show blue prompt emission and green phosphorescence.
- Bromide-based OIMH exhibits yellow excitation-independent emission and second-harmonic generation.
Conclusions:
- Solvent-mediated crystallization is an effective strategy for tuning OIMH structures and optical properties.
- This approach allows control over both prompt and long-lived emissions without heterometal incorporation.
- The findings offer a pathway for designing OIMHs with tailored photoluminescent behaviors.
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