Emissive perovskite quantum wires in robust nanocontainers: CsPbX₃ confined inside boron nitride nanotubes

Light emissive nanostructures were prepared from boron nitride nanotubes (BNNTs) filled with inorganic lead halide perovskites, CsPbBr₃ and CsPbI₃. These one-dimensional nanocontainers provide a platform for facile synthesis of high aspect ratio perovskite quantum wires having color-tunable, highly polarized emission. BNNTs form a flexible and robust protective shell around individual nanowires that mitigates degradation during post-processing for practical applications, while allowing the exploitation of the emission of the perovskite nanowires. The wire diameter can be tuned by choosing appropriate BNNT hosts, giving easy access to well-defined nanowires across the strongly quantum-confined diameter range. The individual encapsulated quantum wires can be used as building blocks for nanoscale photonic devices and to create large-scale flexible assemblies.