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

发布时间:2023-10-19点击次数:

  • 关键字:QUANTUM DOTS; EXCITON RECOMBINATION; ELECTRON RELAXATION; CARRIER RELAXATION; ANION-EXCHANGE; ORGANIC-DYE; SEMICONDUCTOR; PHONON; EMISSION; LUMINESCENCE
  • 摘要: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.
  • 卷号:13
  • 期号:7
  • 是否译文:否
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论文成果

个人信息

  • 职称:教授
  • 学历:博士研究生
  • 学位:工学博士
  • 所在单位:化学与分子工程学院
  • 学科: 物理化学

学术荣誉:

  • 2019  当选: 省高端人才