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Updated: May 5, 2026
08:12
Low Pressure Vapor-assisted Solution Process for Tunable Band Gap Pinhole-free Methylammonium Lead Halide Perovskite Films
Published on: September 8, 2017
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Aqueous Colloidal Perovskite Quantum Emitters
Huajun He1, Bo Wang1, Xuhai Shen2
1Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore, 637371, Singapore.
Advanced Materials (Deerfield Beach, Fla.)
|May 22, 2025
Summary
Stable, water-dispersible halide perovskite nanocrystals (HPNCs) were developed using a novel room-temperature synthesis. These green HPNCs show high emission, excellent stability in water, and tunable colors for optofluidics and sensing applications.
Area of Science:
- Materials Science
- Nanotechnology
- Optoelectronics
Background:
- Aqueous nanoparticle dispersions are crucial for diagnostics and catalysis.
- Halide perovskite nanocrystals (HPNCs) offer unique optoelectronic properties but degrade in water.
- Controlling nanoparticle dispersion is key to product properties.
Purpose of the Study:
- To develop stable, highly emissive HPNCs in aqueous environments.
- To overcome moisture-induced degradation issues in HPNCs.
- To enable new applications in optofluidics and nanoscale sensing.
Main Methods:
- Facile room-temperature synthesis via in situ core-shell self-assembly.
- Characterization of photoluminescence quantum yield (PLQY) and zeta potential.
- Measurement of aqueous solution phase single-photon emission and color tunability.
Main Results:
- Achieved stable, mono-disperse, highly emissive HPNCs in water (>80% PLQY).
- Demonstrated excellent water dispersion stability (>10,000 h, zeta potential >80 mV).
- Observed single-photon emission at ultra-dilute concentrations (≈0.1 nM) and full Rec. 2020 color tunability.
Conclusions:
- A novel method yields stable aqueous HPNCs, overcoming moisture sensitivity.
- These HPNCs enable unprecedented aqueous single-photon emission and color tuning.
- Findings pave the way for HPNCs in photonics, environmental science, and materials engineering.
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