3, University of Southern California, Los Angeles, California, United States
2, Oak Ridge National Laboratory, Oak Ridge, Tennessee, United States
Organic-inorganic metal halide hybrids, consisting of a wide range of inorganic anions and organic cations, are an important class of hybrid crystalline materials with exceptional structure and property tunability. By choosing appropriate organic and inorganic components, the crystallographic structures can be finely controlled with the inorganic metal halide units forming zero- (0D), one- (1D), two- (2D), and three-dimensional (3D) structures in the hybrids. The applications of these materials in optoelectronic devices have been extensively explored in recent years, including photovoltaic cells (PVs), light emitting diodes (LEDs), and optically pumped lasers. The lowering of the structure dimensionality leads to the emerging of unique properties. For instance, unlike narrow emissions with small Stokes shift observed in typical 3D metal halide hybrids, strongly Stokes shifted broadband photoluminescence has been realized in corrugated-2D, 1D, and 0D metal halide hybrids, as a result of exciton self-trapping or excited state structural deformation. The versatility of this class of hybrid materials suggests there is a vast parameter space to explore novel structures to exhibit new and useful properties.
In this talk, I will present our recent efforts in developing and studying new classes of 0D organometal halide hybrids containing tin halide species with different structures. Due to the structural deformation on the excited states, highly luminescent broadband emissions with large Stokes shift have been realized for these 0D organometal halide hybrids. Our work significantly advances the research in organic metal halide hybrids, and provides a platform for fundamental studies of structure-property relationship in bulk crystalline materials.