Environment assisted photoconversion of luminescent surface defects in SiO2 nanoparticles

Marco Cannas, Luisa Spallino, Lavinia Vaccaro, Franco Mario Gelardi, Simonpietro Agnello, Lavinia Vaccaro, Luisa Spallino, Franco M. Gelardi, Monia Spera, Anatoly F. Zatsepin, Marco Cannas, Simonpietro Agnello

Risultato della ricerca: Article

2 Citazioni (Scopus)

Abstract

Time-resolved photoluminescence investigation on SiO2 nanoparticles was carried out in controlled atmosphere, with the aim to discern the effects induced on the typical blue luminescence band by high power UV Nd:YAG laser photons (4.66 eV) and by some selected molecular species of the air (O2, N2, CO2, H2O). These factors ultimately determine both the brightness and photostability of the emitting defect, so as to limit the unique and attracting potentialities offered by this system in many applicative fields. Here it is highlighted that the effects due to photons and molecules, singularly considered, are not additive, the radiation being more dramatic in reducing the emission efficiency. Moreover, by analyzing the kinetics to convert the defects in a non-luminescent configuration both by the direct (photon-defect) and indirect (photon-molecule-defect) interactions, the threshold bleaching fluence is derived, ranging between 5000 J/cm2 (in a vacuum) and 60 J/cm2 (in air). These results indicate that an outstanding enhancement of the defect photostability is gained by passing from ambient atmosphere to vacuum condition, leading to foresee an immediate and relevant improvement in the field of the single-emitter spectroscopy based on the visible emission of SiO2 nanoparticles.
Lingua originaleEnglish
pagine (da-a)94-99
Numero di pagine6
RivistaApplied Surface Science
Volume420
Stato di pubblicazionePublished - 2017

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Surface defects
surface defects
Nanoparticles
Photons
nanoparticles
Defects
defects
photons
Vacuum
controlled atmospheres
vacuum
Molecules
air
bleaching
Bleaching
Air
ultraviolet lasers
Luminescence
YAG lasers
molecules

All Science Journal Classification (ASJC) codes

  • Surfaces, Coatings and Films

Cita questo

Environment assisted photoconversion of luminescent surface defects in SiO2 nanoparticles. / Cannas, Marco; Spallino, Luisa; Vaccaro, Lavinia; Gelardi, Franco Mario; Agnello, Simonpietro; Vaccaro, Lavinia; Spallino, Luisa; Gelardi, Franco M.; Spera, Monia; Zatsepin, Anatoly F.; Cannas, Marco; Agnello, Simonpietro.

In: Applied Surface Science, Vol. 420, 2017, pag. 94-99.

Risultato della ricerca: Article

Cannas, M, Spallino, L, Vaccaro, L, Gelardi, FM, Agnello, S, Vaccaro, L, Spallino, L, Gelardi, FM, Spera, M, Zatsepin, AF, Cannas, M & Agnello, S 2017, 'Environment assisted photoconversion of luminescent surface defects in SiO2 nanoparticles', Applied Surface Science, vol. 420, pagg. 94-99.
Cannas, Marco ; Spallino, Luisa ; Vaccaro, Lavinia ; Gelardi, Franco Mario ; Agnello, Simonpietro ; Vaccaro, Lavinia ; Spallino, Luisa ; Gelardi, Franco M. ; Spera, Monia ; Zatsepin, Anatoly F. ; Cannas, Marco ; Agnello, Simonpietro. / Environment assisted photoconversion of luminescent surface defects in SiO2 nanoparticles. In: Applied Surface Science. 2017 ; Vol. 420. pagg. 94-99.
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abstract = "Time-resolved photoluminescence investigation on SiO2 nanoparticles was carried out in controlled atmosphere, with the aim to discern the effects induced on the typical blue luminescence band by high power UV Nd:YAG laser photons (4.66 eV) and by some selected molecular species of the air (O2, N2, CO2, H2O). These factors ultimately determine both the brightness and photostability of the emitting defect, so as to limit the unique and attracting potentialities offered by this system in many applicative fields. Here it is highlighted that the effects due to photons and molecules, singularly considered, are not additive, the radiation being more dramatic in reducing the emission efficiency. Moreover, by analyzing the kinetics to convert the defects in a non-luminescent configuration both by the direct (photon-defect) and indirect (photon-molecule-defect) interactions, the threshold bleaching fluence is derived, ranging between 5000 J/cm2 (in a vacuum) and 60 J/cm2 (in air). These results indicate that an outstanding enhancement of the defect photostability is gained by passing from ambient atmosphere to vacuum condition, leading to foresee an immediate and relevant improvement in the field of the single-emitter spectroscopy based on the visible emission of SiO2 nanoparticles.",
author = "Marco Cannas and Luisa Spallino and Lavinia Vaccaro and Gelardi, {Franco Mario} and Simonpietro Agnello and Lavinia Vaccaro and Luisa Spallino and Gelardi, {Franco M.} and Monia Spera and Zatsepin, {Anatoly F.} and Marco Cannas and Simonpietro Agnello",
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T1 - Environment assisted photoconversion of luminescent surface defects in SiO2 nanoparticles

AU - Cannas, Marco

AU - Spallino, Luisa

AU - Vaccaro, Lavinia

AU - Gelardi, Franco Mario

AU - Agnello, Simonpietro

AU - Vaccaro, Lavinia

AU - Spallino, Luisa

AU - Gelardi, Franco M.

AU - Spera, Monia

AU - Zatsepin, Anatoly F.

AU - Cannas, Marco

AU - Agnello, Simonpietro

PY - 2017

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N2 - Time-resolved photoluminescence investigation on SiO2 nanoparticles was carried out in controlled atmosphere, with the aim to discern the effects induced on the typical blue luminescence band by high power UV Nd:YAG laser photons (4.66 eV) and by some selected molecular species of the air (O2, N2, CO2, H2O). These factors ultimately determine both the brightness and photostability of the emitting defect, so as to limit the unique and attracting potentialities offered by this system in many applicative fields. Here it is highlighted that the effects due to photons and molecules, singularly considered, are not additive, the radiation being more dramatic in reducing the emission efficiency. Moreover, by analyzing the kinetics to convert the defects in a non-luminescent configuration both by the direct (photon-defect) and indirect (photon-molecule-defect) interactions, the threshold bleaching fluence is derived, ranging between 5000 J/cm2 (in a vacuum) and 60 J/cm2 (in air). These results indicate that an outstanding enhancement of the defect photostability is gained by passing from ambient atmosphere to vacuum condition, leading to foresee an immediate and relevant improvement in the field of the single-emitter spectroscopy based on the visible emission of SiO2 nanoparticles.

AB - Time-resolved photoluminescence investigation on SiO2 nanoparticles was carried out in controlled atmosphere, with the aim to discern the effects induced on the typical blue luminescence band by high power UV Nd:YAG laser photons (4.66 eV) and by some selected molecular species of the air (O2, N2, CO2, H2O). These factors ultimately determine both the brightness and photostability of the emitting defect, so as to limit the unique and attracting potentialities offered by this system in many applicative fields. Here it is highlighted that the effects due to photons and molecules, singularly considered, are not additive, the radiation being more dramatic in reducing the emission efficiency. Moreover, by analyzing the kinetics to convert the defects in a non-luminescent configuration both by the direct (photon-defect) and indirect (photon-molecule-defect) interactions, the threshold bleaching fluence is derived, ranging between 5000 J/cm2 (in a vacuum) and 60 J/cm2 (in air). These results indicate that an outstanding enhancement of the defect photostability is gained by passing from ambient atmosphere to vacuum condition, leading to foresee an immediate and relevant improvement in the field of the single-emitter spectroscopy based on the visible emission of SiO2 nanoparticles.

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