Emergence of multiple fluorophores in individual cesium lead bromide nanocrystals

Zhang, Yuhai; Guo, Tianle; Yang, Haoze; Bose, Riya; Liu, Lingmei; Yin, Jun; Han, Yu; Bakr, Osman M.; Mohammed, Omar F.; Malko, Anton V.

doi:10.1038/s41467-019-10870-1

Title: Emergence of multiple fluorophores in individual cesium lead bromide nanocrystals

Abstract

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.

Authors:

Zhang, Yuhai; Guo, Tianle; Yang, Haoze; Bose, Riya;

;

; Bakr, Osman M.; Mohammed, Omar F.; Malko, Anton V.

Publication Date:: Tue Jul 02 00:00:00 EDT 2019

Research Org.:: Univ. of Texas at Dallas, Richardson, TX (United States)

Sponsoring Org.:: USDOE Office of Science (SC)

OSTI Identifier:: 1635442

Alternate Identifier(s):: OSTI ID: 1611501

Grant/Contract Number:: SC0010697

Resource Type:: Published Article

Journal Name:: Nature Communications

Additional Journal Information:: Journal Name: Nature Communications Journal Volume: 10 Journal Issue: 1; Journal ID: ISSN 2041-1723

Publisher:: Nature Publishing Group

Country of Publication:: United Kingdom

Language:: English

Subject:: 36 MATERIALS SCIENCE; Science & Technology - Other Topics

Citation Formats


                    Zhang, Yuhai, Guo, Tianle, Yang, Haoze, Bose, Riya, Liu, Lingmei, Yin, Jun, Han, Yu, Bakr, Osman M., Mohammed, Omar F., and Malko, Anton V. Emergence of multiple fluorophores in individual cesium lead bromide nanocrystals.  United Kingdom: N. p., 2019. 
Web.  doi:10.1038/s41467-019-10870-1.

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                    Zhang, Yuhai, Guo, Tianle, Yang, Haoze, Bose, Riya, Liu, Lingmei, Yin, Jun, Han, Yu, Bakr, Osman M., Mohammed, Omar F., & Malko, Anton V. Emergence of multiple fluorophores in individual cesium lead bromide nanocrystals.  United Kingdom.  https://doi.org/10.1038/s41467-019-10870-1

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                    Zhang, Yuhai, Guo, Tianle, Yang, Haoze, Bose, Riya, Liu, Lingmei, Yin, Jun, Han, Yu, Bakr, Osman M., Mohammed, Omar F., and Malko, Anton V. Tue .  
"Emergence of multiple fluorophores in individual cesium lead bromide nanocrystals".  United Kingdom.  https://doi.org/10.1038/s41467-019-10870-1.

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@article{osti_1635442,

  title        = {Emergence of multiple fluorophores in individual cesium lead bromide nanocrystals},

  author       = {Zhang, Yuhai and Guo, Tianle and Yang, Haoze and Bose, Riya and Liu, Lingmei and Yin, Jun and Han, Yu and Bakr, Osman M. and Mohammed, Omar F. and Malko, Anton V.},

  abstractNote = {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.},

  doi          = {10.1038/s41467-019-10870-1},

  journal      = {Nature Communications},

  number       = 1,

  volume       = 10,

  place        = {United Kingdom},

  year         = {Tue Jul 02 00:00:00 EDT 2019},

  month        = {Tue Jul 02 00:00:00 EDT 2019}

}

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Title: Emergence of multiple fluorophores in individual cesium lead bromide nanocrystals

Abstract

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