Phonon-assisted up-conversion photoluminescence of quantum dots

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 ex...

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Autores principales: Ye, Zikang, Lin, Xing, Wang, Na, Zhou, Jianhai, Zhu, Meiyi, Qin, Haiyan, Peng, Xiaogang
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2021
Materias:
Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8277828/
https://www.ncbi.nlm.nih.gov/pubmed/34257296
http://dx.doi.org/10.1038/s41467-021-24560-4
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author Ye, Zikang
Lin, Xing
Wang, Na
Zhou, Jianhai
Zhu, Meiyi
Qin, Haiyan
Peng, Xiaogang
author_facet Ye, Zikang
Lin, Xing
Wang, Na
Zhou, Jianhai
Zhu, Meiyi
Qin, Haiyan
Peng, Xiaogang
author_sort Ye, Zikang
collection PubMed
description 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.
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spelling pubmed-82778282021-07-20 Phonon-assisted up-conversion photoluminescence of quantum dots Ye, Zikang Lin, Xing Wang, Na Zhou, Jianhai Zhu, Meiyi Qin, Haiyan Peng, Xiaogang Nat Commun Article 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. Nature Publishing Group UK 2021-07-13 /pmc/articles/PMC8277828/ /pubmed/34257296 http://dx.doi.org/10.1038/s41467-021-24560-4 Text en © The Author(s) 2021 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) .
spellingShingle Article
Ye, Zikang
Lin, Xing
Wang, Na
Zhou, Jianhai
Zhu, Meiyi
Qin, Haiyan
Peng, Xiaogang
Phonon-assisted up-conversion photoluminescence of quantum dots
title Phonon-assisted up-conversion photoluminescence of quantum dots
title_full Phonon-assisted up-conversion photoluminescence of quantum dots
title_fullStr Phonon-assisted up-conversion photoluminescence of quantum dots
title_full_unstemmed Phonon-assisted up-conversion photoluminescence of quantum dots
title_short Phonon-assisted up-conversion photoluminescence of quantum dots
title_sort phonon-assisted up-conversion photoluminescence of quantum dots
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8277828/
https://www.ncbi.nlm.nih.gov/pubmed/34257296
http://dx.doi.org/10.1038/s41467-021-24560-4
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AT zhumeiyi phononassistedupconversionphotoluminescenceofquantumdots
AT qinhaiyan phononassistedupconversionphotoluminescenceofquantumdots
AT pengxiaogang phononassistedupconversionphotoluminescenceofquantumdots

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