In search of new quantum building blocks for future energy and information technologies, low-dimensional hybrid and all-inorganic halide perovskites have emerged as a versatile and promising materials platform. While solution processability is one of their key advantages, vapor-phase methods offer synthetic routes that are unattainable by solution-based approaches, enabling the discovery of new materials, crystal structures, morphologies, and related optoelectronic and quantum-optical properties. In this presentation, I’ll introduce our recent efforts to explore novel excitonic, magnetic, and photonic properties by deliberately introducing transition metal and magnetic dopants into shape-controlled single crystals of two distinct types of low-dimensional halide perovskites: Ruddlesden-Popper-phase hybrid LA2PbBr4 (LA=long ammonium cation) and vacancy-ordered, all-inorganic Cs3Bi2Br9. Defect-free single crystals of these materials, synthesized and doped with functional impurities via chemical vapor deposition, exhibit unusual structural evolution and emission of broadband white light and ultra-long-lived magnetic light, which can be further tailored to support sustainable and energy-efficient device developments. I will discuss their detailed chemical structures and photophysical processes, along with future prospects.
