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Efficient up-conversion photoluminescence in all-inorganic lead halide perovskite nanocrystals

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Abstract

Up-conversion photoluminescence (UCPL) refers to the elementary process where low-energy photons are converted into high-energy ones via consecutive interactions inside a medium. When additional energy is provided by internal thermal energy in the form of lattice vibrations (phonons), the process is called phonon-assisted UCPL. Here, we report the exceptionally large phonon-assisted energy gain of up to ~ 8kBT (kB is Boltzmann constant, T is temperature) on all-inorganic lead halide perovskite semiconductor colloidal nanocrystals that goes beyond the maximum capability of only harvesting optical phonon modes. By systematic optical study in combination with a statistical probability model, we explained the nontrivial phonon-assisted UCPL process in perovskites nanocrystals, where in addition to the strong electron-phonon (light-matter) coupling, other nonlinear processes such as phonon-phonon (matter-matter) interaction also effectively boost the up-conversion efficiency.

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Acknowledgements

Q. X. gratefully acknowledges financial support from the Singapore National Research Foundation through the NRF Investigatorship Award (No. NRF-NRFI2015-03) and the Singapore Ministry of Education via AcRF Tier 3 Programme (No. MOE2018-T3-1-002), Tier 2 grant (No. MOE2018-T2-2-068)and Tier 1 grants (Nos. RG103/15 and RG113/16). A. G. D. A. gratefully acknowledges the financial support of the Presidential Postdoctoral Fellowship program of the Nanyang Technological University. We acknowledge Dr. Lulu Zhang for his help on the TEM characterization.

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  1. Andrés Granados del Águila and T. Thu Ha Do contributed equally to the work.

Authors and Affiliations

  1. Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore, 637371, Singapore

    Andrés Granados del Águila, T. Thu Ha Do, Wen Jie Jee & Qihua Xiong

  2. Key Laboratory of Eco-Chemical Engineering, Ministry of Education, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao, 266042, China

    Jun Xing

  3. Department of Electrical and Computer Engineering, Johns Hopkins University, Baltimore, Maryland, 21218, USA

    Jacob B. Khurgin

  4. State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing, 100084, China

    Qihua Xiong

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  1. Andrés Granados del Águila
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Granados del Águila, A., Do, T.T.H., Xing, J. et al. Efficient up-conversion photoluminescence in all-inorganic lead halide perovskite nanocrystals. Nano Res. 13, 1962–1969 (2020). https://doi.org/10.1007/s12274-020-2840-7

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