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Facile Synthesis of Colloidal Lead Halide Perovskite Nanoplatelets via Ligand-Assisted Reprecipitation
Published on: October 1, 2019
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Poly(catecholamine) coated CsPbBr3 perovskite microlasers: lasing in water and biofunctionalization.
Sangyeon Cho1,2, Seok Hyun Yun1,2
1Wellman Center for Photomedicine, Massachusetts General Hospital and Harvard Medical School, Cambridge, Massachusetts, 02139, USA.
Advanced Functional Materials
|September 20, 2021
Summary
We developed a new method to coat lead halide perovskite (LHP) microcrystals with poly-norepinephrine. This coating enhances LHP stability in water, enabling bright luminescence and lasing for bioimaging applications.
Area of Science:
- Materials Science
- Optoelectronics
- Nanotechnology
Background:
- Lead halide perovskites (LHPs) are promising optoelectronic materials.
- LHPs are sensitive to polar solvents, limiting their application in aqueous environments.
- Surface coatings can improve LHP functionality and stability, but are challenging due to solvent sensitivity.
Purpose of the Study:
- To develop a novel method for synthesizing and functionalizing LHP microlasers in polar solvents.
- To enhance the stability and functionality of LHP microcrystals for applications in aqueous environments.
- To enable biofunctionalization of LHP microcrystals for use in biological systems.
Main Methods:
- Synthesis of cesium lead bromine perovskite (CsPbBr3) microcrystals using sonochemistry in a super-saturated polar solvent.
- In situ coating of CsPbBr3 microcrystals with organic poly-norepinephrine (pNE) layers.
- Characterization of pNE coating for defect passivation and diffusion blocking.
Main Results:
- The pNE coating significantly enhances the water stability of CsPbBr3 microcrystals, increasing material lifetime by 2,000-fold.
- Bright luminescence and lasing from single CsPbBr3 microcrystals were achieved in water.
- The pNE shell enabled successful biofunctionalization with proteins, small molecules, and lipid bilayers.
- Luminescence was sustained in water for over 1 hour and observed in live cells.
Conclusions:
- A novel sonochemical method allows for in situ functionalization of LHP microcrystals in polar solvents.
- Poly-norepinephrine coatings provide exceptional water stability and enable biofunctionalization of LHP microlasers.
- This approach opens new avenues for LHP laser applications in aqueous and biological environments.
