(50c) Low Dimensional Metal Halide Perovskites and Hybrids for Optoelectronics

Metal halide perovskites and perovskite-related organic-inorganic hybrid materials have emerged as new generation functional materials with exceptional structure and property tunability for a wide range of applications, from photovoltaic cells (PVs) to light emitting diodes (LEDs), photodetectors, lasers, and radiation detectors. By controlling the morphological dimensionality of metal halide perovskites with ABX₃ structure, low dimensional perovskite nanocrystals, including 2D nanoplatelets, 1D nanowires, and 0D quantum dots, have been developed to exhibit distinct properties from their 3D counterparts, as a result of quantum size effects. Besides 3D ABX₃ perovskites, organic metal halide hybrids (OMHHs) with low dimensional structures at the molecular level can be prepared by using appropriate organics and metal halides, in which metal halide building blocks, such as metal halide octahedra (BX₆^4-), form 2D, 1D, and 0D structures that are completely isolated and surrounded by organic cations. These OMHHs exhibit unique properties that are significantly different from those of 3D ABX₃ perovskites. For instance, broadband white emissions have been shown in corrugated-2D and 1D OMHHs and near-unity photoluminescence quantum efficiency (PLQE) has been achieved in 0D OMHHs with tunable emissions from blue to green and red. In this talk, I will present our recent efforts on the development and study of low dimensional metal halide perovskites and hybrids, from synthetic control to device integration. The applications of these hybrid materials in optically pumped white LEDs, electroluminescent devices, and X-Ray scintillators will be discussed.