DOI: https://doi.org/10.29363/nanoge.emlem.2023.022
Publication date: 18th August 2023
Self-assembly of colloidal nanocrystals (NCs) into highly ordered structures – superlattices (SLs) – became feasible a few decades ago with the first successful syntheses of monodisperse and shape-uniform colloidal NCs [1]. Close NCs' proximity in the SLs with a long-range positional and orientational ordering facilitate the emergence of diverse synergistic and collective effects different from ensemble-average properties. In this regard, monodisperse and size-tunable lead halide perovskite NCs have drawn much attention owing to their spectrally tunable and narrow, fast and optically coherent (at low temperature) fluorescence. In particular, CsPbBr3 NCs assembled into the single-component SLs were shown to exhibit superfluorescent emission [2]. This stimulated the research into their multicomponent SLs, where lead halide perovskite NCs are co-assembled with dielectric NCs acting as spacers between fluorescent NCs. Consequently, a plethora of novel SL types has become accessible, displaying the superfluorescence phenomena as well [3]. An interesting avenue is to devise superlattices comprising several distinct kinds of light emitters. To this end, we succeeded to co-assemble differently sized CsPbBr3 NCs into binary SLs with a high degree of ordering and a large domain area. This enabled us to reveal, for the first time, a highly efficient Foster-like energy transfer from strongly confined NCs to weakly confined ones in multicomponent CsPbBr3 NC SLs. The strong excitonic coupling between NCs was also manifested by the accelerated exciton diffusion.
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