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Poly(catecholamine) Coated CsPbBr 3 Perovskite Microlasers: Lasing in Water and Biofunctionalization
Author(s) -
Cho Sangyeon,
Yun Seok Hyun
Publication year - 2021
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.202101902
Subject(s) - materials science , perovskite (structure) , coating , luminescence , halide , lasing threshold , surface modification , chemical engineering , nanotechnology , optoelectronics , inorganic chemistry , chemistry , wavelength , engineering
Lead halide perovskite (LHP) is a promising material for various optoelectronic applications. Surface coating on particles is a common strategy to improve their functionality and environmental stability, but LHP is not amenable to most coating chemistries because of its intrinsic weakness against polar solvents. Here, a novel method of synthesizing LHP microlasers in a super‐saturated polar solvent using sonochemistry and applying various functional coatings on individual microlasers in situ is described. Cesium lead bromine perovskite (CsPbBr 3 ) microcrystals, capped with organic poly‐norepinephrine (pNE) layers, are synthesized. The catechol group of pNE coordinates to bromine‐deficient lead atoms, forming a defect‐passivating and diffusion‐blocking shell. The pNE layer enhances the material lifetime of CsPbBr 3 in water by 2000‐fold, enabling bright luminescence and lasing from single microcrystals in water. Furthermore, the pNE shell permits biofunctionalization with proteins, small molecules, and lipid bilayers. Luminescence from CsPbBr 3 microcrystals is sustained in water over 1 h and observed in live cells. The functionalization method may enable new applications of LHP laser particles in water‐rich environments.