Synthesis of Composition Tunable and Highly Luminescent Cesium Lead Halide Nanowires through Anion Exchange Reactions.
Here, we demonstrate the successful synthesis of brightly emitting colloidal cesium lead halide (CsPbX3, X Cl, Br, I) nanowires (NWs) with uniform diameters and tunable compositions. By using highly monodisperse CsPbBr3 NWs as templates, the NW composition can be independently controlled through anion exchange reactions. CsPbX3 alloy NWs with a wide range of alloy compositions can be achieved with well preserved morphology and crystal structure. The NWs are highly luminescent with photoluminescence quantum yields (PLQY) ranging from 20% to 80% The bright photoluminescence can be tuned over nearly the entire visible spectrum. The high PLQYs together with charge transport measurements exemplify the efficient alloying of the anionic sublattice in a one dimensional CsPbX3 system. The wires increased functionality in the form of fast photoresponse rates and the low defect density suggest CsPbX3 NWs as prospective materials for optoelectronic applications.
Journal of the American Chemical Society