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Phonon-assisted up-conversion photoluminescence of quantum dots

Author

Listed:
  • Zikang Ye

    (Zhejiang University)

  • Xing Lin

    (Zhejiang University
    Zhejiang University)

  • Na Wang

    (Zhejiang University)

  • Jianhai Zhou

    (Najing Technology Corporation LTD)

  • Meiyi Zhu

    (Zhejiang University)

  • Haiyan Qin

    (Zhejiang University)

  • Xiaogang Peng

    (Zhejiang University)

Abstract

Phonon-assisted up-conversion photoluminescence can boost energy of an emission photon to be higher than that of the excitation photon by absorbing vibration energy (or phonons) of the emitter. Here, up-conversion photoluminescence power-conversion efficiency (power ratio between the emission and excitation photons) for CdSe/CdS core/shell quantum dots is observed to be beyond unity. Instead of commonly known defect-assisted up-conversion photoluminescence for colloidal quantum dots, temperature-dependent measurements and single-dot spectroscopy reveal the up-conversion photoluminescence and conventional down-conversion photoluminescence share the same electron-phonon coupled electronic states. Ultrafast spectroscopy results imply the thermalized excitons for up-conversion photoluminescence form within 200 fs, which is 100,000 times faster than the radiative recombination rate of the exciton. Results suggest that colloidal quantum dots can be exploited as efficient, stable, and cost-effective emitters for up-conversion photoluminescence in various applications.

Suggested Citation

  • Zikang Ye & Xing Lin & Na Wang & Jianhai Zhou & Meiyi Zhu & Haiyan Qin & Xiaogang Peng, 2021. "Phonon-assisted up-conversion photoluminescence of quantum dots," Nature Communications, Nature, vol. 12(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-24560-4
    DOI: 10.1038/s41467-021-24560-4
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    References listed on IDEAS

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    1. Jun Zhang & Dehui Li & Qihua Xiong, 2019. "Reply to: Can lasers really refrigerate CdS nanobelts?," Nature, Nature, vol. 570(7762), pages 62-64, June.
    2. Jun Zhang & Dehui Li & Renjie Chen & Qihua Xiong, 2013. "Laser cooling of a semiconductor by 40 kelvin," Nature, Nature, vol. 493(7433), pages 504-508, January.
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