Inorganic halide perovskites such as CsPbX3 have emerged as a better alternative for various optoelectronic applications due to their ease of preparation, narrow emission peak widths, short radiative lifetimes and remarkably high quantum yield in colloidal solution. However, the progress in their exploration has been hindered in different areas such as stability and providing an effective purification that can maintain or improve their external quantum efficiency. The ionic character of CsPbX3 makes them very sensitive to polar solvents which usually compromise their structural integrity. Here, we report the use of gel permeation chromatography for effective purification of CsPbBr3 nanocrystals and study the effects of this purification on ligand populations and their optoelectronic properties. We also show that near-unity quantum yield and high colloidal stability can be achieved for CsPbBr3 using gel-permeation chromatography. We take our ability to manipulate the particles in this way to explore several post-synthetic reactions.

Surface chemistry and gel permeation chromatography purification of CsPbBr3 nanocrystals with high quantum yield and colloidal stability

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.