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Emergence of multiple fluorophores in individual cesium lead bromide nanocrystals

Author

Listed:
  • Yuhai Zhang

    (King Abdullah University of Science and Technology
    University of Jinan)

  • Tianle Guo

    (The University of Texas at Dallas)

  • Haoze Yang

    (King Abdullah University of Science and Technology)

  • Riya Bose

    (The University of Texas at Dallas)

  • Lingmei Liu

    (King Abdullah University of Science and Technology)

  • Jun Yin

    (King Abdullah University of Science and Technology)

  • Yu Han

    (King Abdullah University of Science and Technology)

  • Osman M. Bakr

    (King Abdullah University of Science and Technology)

  • Omar F. Mohammed

    (King Abdullah University of Science and Technology)

  • Anton V. Malko

    (The University of Texas at Dallas)

Abstract

Cesium-based perovskite nanocrystals (PNCs) possess alluring optical and electronic properties via compositional and structural versatility, tunable bandgap, high photoluminescence quantum yield and facile chemical synthesis. Despite the recent progress, origins of the photoluminescence emission in various types of PNCs remains unclear. Here, we study the photon emission from individual three-dimensional and zero-dimensional cesium lead bromide PNCs. Using photon antibunching and lifetime measurements, we demonstrate that emission statistics of both type of PNCs are akin to individual molecular fluorophores, rather than traditional semiconductor quantum dots. Aided by density functional modelling, we provide compelling evidence that green emission in zero-dimensional PNCs stems from exciton recombination at bromide vacancy centres within lead-halide octahedra, unrelated to external confinement. These findings provide key information about the nature of defect formation and the origin of emission in cesium lead halide perovskite materials, which foster their utilization in the emerging optoelectronic applications.

Suggested Citation

  • Yuhai Zhang & Tianle Guo & Haoze Yang & Riya Bose & Lingmei Liu & Jun Yin & Yu Han & Osman M. Bakr & Omar F. Mohammed & Anton V. Malko, 2019. "Emergence of multiple fluorophores in individual cesium lead bromide nanocrystals," Nature Communications, Nature, vol. 10(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:10:y:2019:i:1:d:10.1038_s41467-019-10870-1
    DOI: 10.1038/s41467-019-10870-1
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