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Research Article

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

Andrés Granados del Águila1,§, T. Thu Ha Do1,§, Jun Xing2, Wen Jie Jee1, Jacob B. Khurgin3, Qihua Xiong1,4( )
Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore
Key Laboratory of Eco-Chemical Engineering, Ministry of Education, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
Department of Electrical and Computer Engineering, Johns Hopkins University, Baltimore, Maryland 21218, USA
State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China

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

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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.

Keywords

up-conversion photoluminescencephononslead halide perovskitecolloidal nanocrystals

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Nano Research
Volume 13 Issue 7,
July 2020
Pages 1962-1969
DOI: 10.1007/s12274-020-2840-7
Cite this article:
del Águila AG, Do TTH, Xing J, et al. Efficient up-conversion photoluminescence in all-inorganic lead halide perovskite nanocrystals. Nano Research, 2020, 13(7): 1962-1969. https://doi.org/10.1007/s12274-020-2840-7
Topics:
Lattice vibrationsLead compoundsNanocrystalsPerovskitePhotoluminescence
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Received: 16 January 2020
Revised: 23 April 2020
Accepted: 29 April 2020
Published: 23 May 2020
© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2020
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