4.8 Article

Integration of Highly Luminescent Lead Halide Perovskite Nanocrystals on Transparent Lead Halide Nanowire Waveguides through Morphological Transformation and Spontaneous Growth in Water

期刊

SMALL
卷 18, 期 11, 页码 -

出版社

WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.202105009

关键词

CsPb; Br-2; (5) nanowires; dissolution-recrystalization; luminescence; morphological transformation; nanowire waveguide integration

资金

  1. National Natural Science Foundation of China [62064013, 12164051, 11564043]
  2. Joint Foundation of Provincial Science and Technology Department-Double First-class Construction of Yunnan University [2019FY003016]
  3. Young Top Talent Project of Yunnan Province [YNWR-QNBJ-2018-229]
  4. Robert A. Welch Foundation [E-1728]
  5. U.S. National Science Foundation [DMR-2016453, DMR-1565822]
  6. Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy [DE-AC02-05CH11231]
  7. Application Basic Research Project of Yunnan Province [2019FB130]

向作者/读者索取更多资源

The growth of highly luminescent CsPbBr3 quantum dots on CsPb2Br5 nanowires has great potential for applications in nanophotonics, optical sensing, and quantum communications. CsPbBr3-gamma X-gamma (X = Cl, I) nanocrystals on CsPb2Br5-gamma X-gamma nanowires are synthesized by immersing CsPbBr3 powder into pure water, providing tunable light sources. The transformation from CsPbBr3 powder to CsPb2Br5 microplatelets and then to nanowires is controlled by electrolytic dissociation and supersaturation of CsPb2Br5. CsPbBr3 nanocrystals are spontaneously formed on CsPb2Br5 nanowires when collected from the aqueous solution.
The integration of highly luminescent CsPbBr3 quantum dots on nanowire waveguides has enormous potential applications in nanophotonics, optical sensing, and quantum communications. On the other hand, CsPb2Br5 nanowires have also attracted a lot of attention due to their unique water stability and controversial luminescent property. Here, the growth of CsPbBr3 nanocrystals on CsPb2Br5 nanowires is reported first by simply immersing CsPbBr3 powder into pure water, CsPbBr3-gamma X-gamma (X = Cl, I) nanocrystals on CsPb2Br5-gamma X-gamma nanowires are then synthesized for tunable light sources. Systematic structure and morphology studies, including in situ monitoring, reveal that CsPbBr3 powder is first converted to CsPb2Br5 microplatelets in water, followed by morphological transformation from CsPb2Br5 microplatelets to nanowires, which is a kinetic dissolution-recrystallization process controlled by electrolytic dissociation and supersaturation of CsPb2Br5. CsPbBr3 nanocrystals are spontaneously formed on CsPb2Br5 nanowires when nanowires are collected from the aqueous solution. Raman spectroscopy, combined photoluminescence, and SEM imaging confirm that the bright emission originates from CsPbBr3-gamma X-gamma nanocrystals while CsPb2Br5-gamma X-gamma nanowires are transparent waveguides. The intimate integration of nanoscale light sources with a nanowire waveguide is demonstrated through the observation of the wave guiding of light from nanocrystals and Fabry-Perot interference modes of the nanowire cavity.

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