Environment assisted photoconversion of luminescent surface defects in SiO2 nanoparticles

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

Risultato della ricerca: Articlepeer review

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

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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