Heterostructure Engineering of 0D/1D Lead-Free Metal Halide Perovskites for Bright White Light Emission

Metal halide perovskites received wide attention for optoelectronic applications due to their surpassing optoelectronic properties like superior charge transport and defect tolerance. Particularly, low-dimensional lead-free cesium copper iodide perovskites have emerged as appropriate candidates for white emitters with broadband self-trapped exciton emission. However, the formation of low-emissive heterophases during the synthesis lowers the overall efficiency and therefore strategies for boosting the efficiency of overall white light emission is critical for developing lead-free perovskite-based white light emitters. Herein, we designed an appropriate formation route for highly-emissive white emitting perovskite heterostructure via mechanochemical synthesis. We also introduced mechanochemical post ligand treatment for facile formation of white-emitting cesium copper iodide perovskite nanocrystals, which can further shine light on their further optoelectronic applications.