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Enhanced trion emission from colloidal quantum dots with photonic crystals by two-photon excitation

For colloidal quantum dots, the ongoing biggest problem is their fluorescence blinking. Until now, there is no generally accepted model for this fluorescence blinking. Here, two-photon excited fluorescence from CdSe/ZnS nanocrystals on silicon nitride photonic crystals is studied using a femtosecond...

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Autor principal: Xu, Xingsheng
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2013
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3828571/
https://www.ncbi.nlm.nih.gov/pubmed/24231669
http://dx.doi.org/10.1038/srep03228
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author Xu, Xingsheng
author_facet Xu, Xingsheng
author_sort Xu, Xingsheng
collection PubMed
description For colloidal quantum dots, the ongoing biggest problem is their fluorescence blinking. Until now, there is no generally accepted model for this fluorescence blinking. Here, two-photon excited fluorescence from CdSe/ZnS nanocrystals on silicon nitride photonic crystals is studied using a femtosecond laser. From analysis of the spectra and decay processes, most of the relative trion efficiency is larger than 10%, and the largest relative trion efficiency reaches 46.7%. The photonic crystals enhance the trion emission of CdSe/ZnS nanocrystals, where the enhancement is due to the coupling of the trion emission to the leaky mode of the photonic crystal slab. Moreover, the photonic crystals enhance the Auger-assisted trapping efficiency of electrons/holes to surface states, and then enhance the efficiency of the generations of charge separation and DC electric field, which modifies the trion spectrum. Therefore, a model is present for explaining the mechanism of fluorescence blinking including the effect of the environment.
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spelling pubmed-38285712013-11-15 Enhanced trion emission from colloidal quantum dots with photonic crystals by two-photon excitation Xu, Xingsheng Sci Rep Article For colloidal quantum dots, the ongoing biggest problem is their fluorescence blinking. Until now, there is no generally accepted model for this fluorescence blinking. Here, two-photon excited fluorescence from CdSe/ZnS nanocrystals on silicon nitride photonic crystals is studied using a femtosecond laser. From analysis of the spectra and decay processes, most of the relative trion efficiency is larger than 10%, and the largest relative trion efficiency reaches 46.7%. The photonic crystals enhance the trion emission of CdSe/ZnS nanocrystals, where the enhancement is due to the coupling of the trion emission to the leaky mode of the photonic crystal slab. Moreover, the photonic crystals enhance the Auger-assisted trapping efficiency of electrons/holes to surface states, and then enhance the efficiency of the generations of charge separation and DC electric field, which modifies the trion spectrum. Therefore, a model is present for explaining the mechanism of fluorescence blinking including the effect of the environment. Nature Publishing Group 2013-11-15 /pmc/articles/PMC3828571/ /pubmed/24231669 http://dx.doi.org/10.1038/srep03228 Text en Copyright © 2013, Macmillan Publishers Limited. All rights reserved http://creativecommons.org/licenses/by-nc-nd/3.0/ This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License. To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-nd/3.0/
spellingShingle Article
Xu, Xingsheng
Enhanced trion emission from colloidal quantum dots with photonic crystals by two-photon excitation
title Enhanced trion emission from colloidal quantum dots with photonic crystals by two-photon excitation
title_full Enhanced trion emission from colloidal quantum dots with photonic crystals by two-photon excitation
title_fullStr Enhanced trion emission from colloidal quantum dots with photonic crystals by two-photon excitation
title_full_unstemmed Enhanced trion emission from colloidal quantum dots with photonic crystals by two-photon excitation
title_short Enhanced trion emission from colloidal quantum dots with photonic crystals by two-photon excitation
title_sort enhanced trion emission from colloidal quantum dots with photonic crystals by two-photon excitation
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3828571/
https://www.ncbi.nlm.nih.gov/pubmed/24231669
http://dx.doi.org/10.1038/srep03228
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