期刊
NANO RESEARCH
卷 13, 期 7, 页码 1962-1969出版社
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-020-2840-7
关键词
up-conversion photoluminescence; phonons; lead halide perovskite; colloidal nanocrystals
类别
资金
- Singapore National Research Foundation through the NRF Investigatorship Award [NRF-NRFI2015-03]
- Singapore Ministry of Education via AcRF Tier 3 Programme [MOE2018-T3-1-002]
- Singapore Ministry of Education via AcRF Tier 2 grant [MOE2018-T2-2-068]
- Singapore Ministry of Education via AcRF Tier 1 grants [RG103/15, RG113/16]
- Nanyang Technological University
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 similar to 8k(B)T (k(B) 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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