DOI: https://doi.org/10.29363/nanoge.emlem.2024.039
Publication date: 13th July 2024
The past decade has seen the discovery and the rapid development of colloidal lead halide perovskite nanocrystals (LHP NCs) of APbX3 stoichiometry. These materials have captured broad interest due to their straightforward synthesis and outstanding optical properties. The compositional engineering of LHP NCs via the A-site cation (Cs+, formamidinium, and methylammonium) represents a lever to fine-tune their structural and electronic properties. Inspired by recent reports on bulk single crystals with aziridinium (AZ) as the A-site cation, we present a facile colloidal synthesis of AZPbBr3 NCs with a narrow size distribution and size tunability down to 4 nm, producing quantum dots in the regime of strong quantum confinement with bright photoluminescence and quantum efficiencies of up to 80% [1].
LHP NCs are also attractive blocks for creating controlled NC self-assembly with collective luminescence phenomena, such as superfluorescence. We reported a broad structural diversity in multicomponent, long-range ordered superlattices (SLs) comprising highly luminescent cubic CsPbBr3 NCs (and FAPbBr3 NCs) co-assembled with the spherical, truncated cuboid, and disk-shaped NC building blocks such as Fe3O4, PbS, NaGdF4, and LaF3 NCs [2,3]. These mesostructures also exhibit superfluorescence, characterized at high excitation density, by emission pulses with ultrafast radiative decay. The formation of such SLs was rationalized using entropy-maximization arguments and ligand-deformability. In the multicomponent LHP NC-only SLs comprising CsPbBr3 NCs of different sizes as building blocks, efficient NC coupling and Förster-like energy transfer from strongly confined 5.3 nm CsPbBr3 NCs to weakly confined 17.6 nm CsPbBr3 NCs were observed [4]. The presentation will extend to the most recent work, wherein NCs are co-assembled with molecular entities.
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