Abstract
Metal halide perovskites (MHPs) are promising for light emitting diodes (LEDs) due to their high color purity, band gap tunability and low cost of fabrication. However, their actual commercial use in LEDs is hindered by insufficient external quantum efficiency and instability to external triggers including heating, moisture and oxygen. I will therefore develop well-organized self-assemblies of MHP nanocrystals, for which the stability is expected to be majorly improved, due to the close packing and the doping of individual nanocrystals. In addition, the collective properties of the assemblies are envisaged to result in enhanced efficiency. Consequently, highly uniform, optically active and stable active layers for LEDs will be obtained. The synthesis and assembly will be guided by iterative measurements of the optical properties together with a detailed characterization by quantitative transmission electron microscopy (TEM). 3D characterization will allow me to extract quantitative descriptors to evaluate the packing of the nanocrystals, whereas in situ TEM studies will enable me to understand the degradation behavior so that my project will open the route to the incorporation of assemblies of MHP nanocrystals in the next generation of LEDs. I therefore aim at proving the use of self-assembled MHPs for LEDs in an experimental proof-of-concept (TRL 3) up to a technology validated in the laboratory (TRL 4).
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