Proceedings of MATSUS Spring 2024 Conference (MATSUS24)
DOI: https://doi.org/10.29363/nanoge.matsus.2024.439
Publication date: 18th December 2023
II-VI semiconductor nanoplatelets have attracted much interest due to their narrow optical properties controlled by the thickness of these 2D particles. Thanks to the synthesis of heterostructures, it is possible to grow NPLs with more than one emission thus breaking the Kasha’s rule. With core/crown/crown CdSe/CdTe/CdSe NPLs composed at 95% of CdSe, a dual emission is obtained where a green emission arises from the recombination of the exciton through the band edge in 4 ML CdSe NPLs while a red emission arises from the type II band alignment between CdSe and CdTe. To improve their quantum yield a shell needs to be grown however this also leads to a red shift of their optical features. So, we propose a new heterostructure with blue-shifted dual emission which shell growth induces two emissions in a range with potential applications in displays. These NPLs can be introduced in light emitting diodes which exhibit dual NPLs as in the active materials.
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