DOI: https://doi.org/10.29363/nanoge.incnc.2021.061
Publication date: 8th June 2021
Colloidal lead halide perovskite nanocrystals (LHP NCs, NCs, A=Cs+, FA+, FA=formamidinium; X=Cl, Br, I) have become a research spotlight owing to their spectrally narrow (<100 meV) fluorescence, tunable over the entire visible spectral region of 400-800 nm, as well as facile colloidal synthesis. These NCs are attractive single-photon emitters as well as make for an attractive building block for creating controlled, aggregated states exhibiting collective luminescence phenomena. Attaining of such states through the spontaneous self-assembly into long-range ordered superlattices (SLs) is a particularly attractive avenue. In this regard also the atomically-flat, sharp cuboic shape of LHP NCs is of interest, because vast majority of prior work had invoked NCs of rather spherical shape. Long-range ordered SLs with the simple cubic packing of cubic perovskite NCs exhibit sharp red-shifted lines in their emission spectra and superfluorescence (a fast collective emission resulting from coherent multi-NCs excited states). When combined with spherical dielectric NCs, perovskite-type ABO3 binary NC SLs form, wherein CsPbBr3 nanocubes occupy B- and/or O-sites, while with spherical dielectric Fe3O4 or NaGdF4 NCs reside on A-sites.1 When truncated-cuboid PbS NCs are added to these systems, ternary ABO3-phase form (PbS NCs occuoy B-sites). Such ABO3 SLs, as well as other newly obtained SL structures (binary NaCl- and AlB2-types, columnar assemblies with disks etc.), exhibit a high degree of orientational ordering of CsPbBr3 nanocubes. These mesostructures exhibit superfluorescence as well, characterized, at high excitation density, by emission pulses with ultrafast (22 ps) radiative decay and Burnham-Chiao ringing behaviour with a strongly accelerated build-up time.
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