Proceedings of Online school on Fundamentals of Semiconductive Quantum Dots (QDsSCHOOL)
DOI: https://doi.org/10.29363/nanoge.qdsschool.2021.012
Publication date: 30th April 2021
Two-dimensional colloidal nanoplatelets (NPLs) are solution-processed materials with a particular shape, that can be designed toward unique absorption and emission properties. Importantly, optimization of the chemical synthesis goes hand in hand with insights into the optoelectronic properties, obtained from linear and nonlinear absorption spectroscopy, fluorescence spectroscopy and calculations of the nanocrystal band structure.
In this talk, I will discuss recent progress made for CdSe-based 2D nanocrystals, featuring CdSe/ZnS type-I core/shell NPLs with fast, color-tunable emission, suitable as phospors for lasing or LEDs, as well as doped CdSe:Ag NPLs and CdSe/CdTe NPLs with a type-II band offset, which in both cases exhibit fluorescence that is strongly Stokes shifted and has a lifetime beyond 100 ns, which can find application in energy harvesting. For the latter, we were able to insert an intermediate CdS tunneling barrier at the CdSe/CdTe interface, and obtain red and near-infrared to green fluorescence upconversion. This flexibility to design NPL heterostructures has led to a wide range of applications, from light emitting devices, to ultrafast scintillators and luminescent solar concentrators.
This project has received funding from the European Research Council (ERC) under the European Union’s Horizon 2020
research and innovation program (grant agreement no. 714876 PHOCONA).
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