3 years ago

Engineering Bicolor Emission in 2D Core/Crown CdSe/CdSe1–xTex Nanoplatelet Heterostructures Using Band-Offset Tuning

Engineering Bicolor Emission in 2D Core/Crown CdSe/CdSe1–xTex Nanoplatelet Heterostructures Using Band-Offset Tuning
Nicolas Lequeux, Eva Izquierdo, Emmanuel Lhuillier, Thierry Barisien, Marion Dufour, Maria Chamarro, Thomas Pons, Violette Steinmetz, Sandrine Ithurria, Laurent Legrand
Colloidal 2D nanoplatelets (NPLs) are a class of nanoparticles that offer the possibility of forming two types of heterostructures, by growing either in the confined direction or perpendicular to the confined direction, called core/crown NPLs. Here, we demonstrate that bicolor emission can be obtained from 2D NPLs with a core/crown geometry. To date, for CdSe/CdTe NPLs with type-II band alignment, only charge transfer emission has been observed due to the very fast (1–xTex alloys crowned with the right composition and lateral extension enables the observation of bicolor emission at the single-particle level. One source of emission originates from recombination at the core/crown interface (Xint), and the other emission source originates from direct recombination in the crown (Xcrown). This crown emission, which is nonvisible in pure CdSe/CdTe core crown NPLs, results from the large binding energy compared to the reduced conduction band offset existing in the alloy with intermediate (60%) Te content. These observations are only made possible by the 2D geometry of the NPLs.

Publisher URL: http://dx.doi.org/10.1021/acs.jpcc.7b06527

DOI: 10.1021/acs.jpcc.7b06527

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