Researchers discovered semiconducting nanocrystals that not only function as stellar light-to-energy converters but also as stable light emitters. Scientists synthesized a series of perovskite nanocrystals with different morphologies i.e., dots, rods, wires, plates, and sheets. Perovskite materials such as CH3NH3PbX3 (X = I, Br) are known to display many intriguing electronic light and chemical properties. Studies found that the rods and wires showed higher photoluminescence and longer photoluminescence lifetimes compared to other shapes. Further optical studies revealed that the nanocrystals with iodine are stable single particle emitters at room temperature. Honing methods to fine-tune these characteristics may lead to more efficient materials, as performance depends critically on composition, crystallinity, and morphology. These perovskites may be of future use in the construction of new porous and nanostructured solar cell architectures, as well as light-emitting devices and for single particle imaging and tracking.
Shape Evolution and Single Particle Luminescence of Organometal Halide Perovskite Nanocrystals