Rapid separation and purification of lead halide perovskite quantum dots through differential centrifugation in nonpolar solvent.

ABSTRACT: We report the rapid separation and purification of lead halide perovskite quantum dots (QDs) in a nonpolar solvent by using a convenient and efficient differential separation method. Size-selective precipitation effectively separates the perovskite QDs from larger aggregates and provides direct evidence for strong quantum confinement in the photoluminescence (PL). Significantly, the size-selected perovskite QDs are readily well-dispersed in a nonpolar solvent and remain stable in ambient air (humidity > 60%) for >20 days. These enable measurement of the electronic band structure of versatile perovskite QDs as a function of size for the first time. Despite a clear blue-shift of the optical bandgap, the lowest unoccupied molecular orbital (LUMO) readily moves towards the vacuum level while t

SUBMITTER: Zhou S 

PROVIDER: S-EPMC9038089 | biostudies-literature | 2021 Aug

REPOSITORIES: biostudies-literature