Low Dimensional Metal Halide Perovskites and Hybrids for Light Emitting Diodes

Metal halide perovskites and perovskite-related organic metal halide hybrids have recently emerged as new generation light emitting materials with exceptional structure and property tunability. By controlling the morphological dimensionality of metal halide perovskites with ABX₃ structure, low dimensional perovskite nanocrystals, e.g. 2D nanoplatelets, 1D nanowires, and 0D quantum dots, have been developed to exhibit enhanced optical properties and stability as compared to 3D counterparts. Besides 3D ABX₃ perovskites, organic metal halide hybrids with low dimensional structures at the molecular level can be prepared by using appropriate organics and metal halides, in which metal halide building blocks form 2D, 1D, and 0D structures that are completely isolated and surrounded by organic cations. These organic metal halide hybrids exhibit unique properties that are different from those of 3D ABX₃ perovskites. For instance, tunable broadband emissions with near-unity photoluminescence quantum efficiencies have been achieved in a series of 0D organic metal halide hybrids. In this talk, I will present our recent efforts on the development and study of highly luminescent and stable low dimensional metal halide perovskites and organic metal halide hybrids. Their applications in electrically driven light emitting diodes (LEDs) will be discussed.