Research Article

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2020, 13(7): 1962–1969

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https://doi.org/10.1007/s12274-020-2840-7

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

Andrs Granados del guila1,, T. Thu Ha Do1,, Jun Xing2, Wen Jie Jee1, Jacob B. Khurgin3, and Qihua Xiong1,4 (*)

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1 Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore
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
3 Department of Electrical and Computer Engineering, Johns Hopkins University, Baltimore, Maryland 21218, USA
4 State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China
Andrs Granados del guila and T. Thu Ha Do contributed equally to the work.

Keywords: up-conversion photoluminescence, phonons, lead halide perovskite, colloidal nanocrystals
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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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Efficient up-conversion photoluminescence in all-inorganic lead halide perovskite nanocrystals. Nano Res. 2020, 13(7): 1962–1969 https://doi.org/10.1007/s12274-020-2840-7

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