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Synthesis of Composition Tunable and Highly Luminescent Cesium Lead Halide Nanowires through Anion-Exchange Reactions.

  • Author(s): Zhang, Dandan
  • Yang, Yiming
  • Bekenstein, Yehonadav
  • Yu, Yi
  • Gibson, Natalie A
  • Wong, Andrew B
  • Eaton, Samuel W
  • Kornienko, Nikolay
  • Kong, Qiao
  • Lai, Minliang
  • Alivisatos, A Paul
  • Leone, Stephen R
  • Yang, Peidong
  • et al.
Abstract

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.

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