Abstract
Self-assembly of nanoscale building blocks into ordered nanoarchitectures has emerged as a simple and powerful approach for tailoring the nanoscale properties and the opportunities of using these properties for the development of novel optoelectronic nanodevices. Here, the one-pot synthesis of CsPbBr3 perovskite supercrystals (SCs) in a colloidal dispersion by ultrasonication is reported. The growth of the SCs occurs through the spontaneous self-assembly of individual nanocrystals (NCs), which form in highly concentrated solutions of precursor powders. The SCs retain the high photoluminescence (PL) efficiency of their NC subunits, however also exhibit a redshifted emission wavelength compared to that of the individual nanocubes due to interparticle electronic coupling. This redshift makes the SCs pure green emitters with PL maxima at approximate to 530-535 nm, while the individual nanocubes emit a cyan-green color (approximate to 512 nm). The SCs can be used as an emissive layer in the fabrication of pure green light-emitting devices on rigid or flexible substrates. Moreover, the PL emission color is tunable across the visible range by employing a well-established halide ion exchange reaction on the obtained CsPbBr3 SCs. These results highlight the promise of perovskite SCs for light emitting applications, while providing insight into their collective optical properties.
| Dokumententyp: | Zeitschriftenartikel |
|---|---|
| Fakultätsübergreifende Einrichtungen: | Center for NanoScience (CENS) |
| Themengebiete: | 500 Naturwissenschaften und Mathematik > 500 Naturwissenschaften |
| ISSN: | 0935-9648 |
| Sprache: | Englisch |
| Dokumenten ID: | 68061 |
| Datum der Veröffentlichung auf Open Access LMU: | 19. Jul. 2019, 12:23 |
| Letzte Änderungen: | 04. Nov. 2020, 13:50 |
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