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Open Access Publications from the University of California

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

  • Author(s): Zhang, D
  • Yang, Y
  • Bekenstein, Y
  • Yu, Y
  • Gibson, NA
  • Wong, AB
  • Eaton, SW
  • Kornienko, N
  • Kong, Q
  • Lai, M
  • Alivisatos, AP
  • Leone, SR
  • Yang, P
  • et al.

© 2016 American Chemical Society. 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 CsPbBr3NWs as templates, the NW composition can be independently controlled through anion-exchange reactions. CsPbX3alloy 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 CsPbX3system. The wires increased functionality in the form of fast photoresponse rates and the low defect density suggest CsPbX3NWs as prospective materials for optoelectronic applications.

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