Enhancing the luminescence efficiency of silicon-nanocrystals by interaction with H+ions

Risultato della ricerca: Article

2 Citazioni (Scopus)

Abstract

The emission of silicon nanocrystals (Si-NCs), synthesized by pulsed laser ablation in water, was investigated on varying the pH of the solution. These samples emit μs decaying orange photoluminescence (PL) associated with radiative recombination of quantum-confined excitons. Time-resolved spectra reveal that both the PL intensity and the lifetime increase by a factor of ∼20 when the pH decreases from 10 to 1 thus indicating that the emission quantum efficiency increases by inhibiting nonradiative decay rates. Infrared (IR) absorption and electron paramagnetic resonance (EPR) experiments allow addressing the origin of defects on which the excitons nonradiatively recombine. The linear correlation between the PL and the growth of SiH groups demonstrates that H+ions passivate the nonradiative defects that are located in the interlayer between the Si-NC core and the amorphous SiO2 shell.
Lingua originaleEnglish
pagine (da-a)10445-10449
Numero di pagine5
RivistaPhysical Chemistry Chemical Physics
Volume20
Stato di pubblicazionePublished - 2018

Fingerprint

Beam plasma interactions
Silicon
Nanocrystals
Luminescence
Photoluminescence
nanocrystals
Ions
luminescence
photoluminescence
silicon
excitons
Defects
ions
defects
Infrared absorption
interactions
radiative recombination
Laser ablation
Pulsed lasers
Quantum efficiency

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

Cita questo

@article{176546fa15244d0ea635f7f31a3d44dc,
title = "Enhancing the luminescence efficiency of silicon-nanocrystals by interaction with H+ions",
abstract = "The emission of silicon nanocrystals (Si-NCs), synthesized by pulsed laser ablation in water, was investigated on varying the pH of the solution. These samples emit μs decaying orange photoluminescence (PL) associated with radiative recombination of quantum-confined excitons. Time-resolved spectra reveal that both the PL intensity and the lifetime increase by a factor of ∼20 when the pH decreases from 10 to 1 thus indicating that the emission quantum efficiency increases by inhibiting nonradiative decay rates. Infrared (IR) absorption and electron paramagnetic resonance (EPR) experiments allow addressing the origin of defects on which the excitons nonradiatively recombine. The linear correlation between the PL and the growth of SiH groups demonstrates that H+ions passivate the nonradiative defects that are located in the interlayer between the Si-NC core and the amorphous SiO2 shell.",
author = "Lavinia Vaccaro and Marco Cannas and Tiziana Fiore and Fabrizio Messina and {Li Vigni}, Maria and Francesco Amato and Francesco Amato",
year = "2018",
language = "English",
volume = "20",
pages = "10445--10449",
journal = "Physical Chemistry Chemical Physics",
issn = "1463-9076",
publisher = "Royal Society of Chemistry",

}

TY - JOUR

T1 - Enhancing the luminescence efficiency of silicon-nanocrystals by interaction with H+ions

AU - Vaccaro, Lavinia

AU - Cannas, Marco

AU - Fiore, Tiziana

AU - Messina, Fabrizio

AU - Li Vigni, Maria

AU - Amato, Francesco

AU - Amato, Francesco

PY - 2018

Y1 - 2018

N2 - The emission of silicon nanocrystals (Si-NCs), synthesized by pulsed laser ablation in water, was investigated on varying the pH of the solution. These samples emit μs decaying orange photoluminescence (PL) associated with radiative recombination of quantum-confined excitons. Time-resolved spectra reveal that both the PL intensity and the lifetime increase by a factor of ∼20 when the pH decreases from 10 to 1 thus indicating that the emission quantum efficiency increases by inhibiting nonradiative decay rates. Infrared (IR) absorption and electron paramagnetic resonance (EPR) experiments allow addressing the origin of defects on which the excitons nonradiatively recombine. The linear correlation between the PL and the growth of SiH groups demonstrates that H+ions passivate the nonradiative defects that are located in the interlayer between the Si-NC core and the amorphous SiO2 shell.

AB - The emission of silicon nanocrystals (Si-NCs), synthesized by pulsed laser ablation in water, was investigated on varying the pH of the solution. These samples emit μs decaying orange photoluminescence (PL) associated with radiative recombination of quantum-confined excitons. Time-resolved spectra reveal that both the PL intensity and the lifetime increase by a factor of ∼20 when the pH decreases from 10 to 1 thus indicating that the emission quantum efficiency increases by inhibiting nonradiative decay rates. Infrared (IR) absorption and electron paramagnetic resonance (EPR) experiments allow addressing the origin of defects on which the excitons nonradiatively recombine. The linear correlation between the PL and the growth of SiH groups demonstrates that H+ions passivate the nonradiative defects that are located in the interlayer between the Si-NC core and the amorphous SiO2 shell.

UR - http://hdl.handle.net/10447/288452

UR - http://pubs.rsc.org/en/journals/journal/cp

M3 - Article

VL - 20

SP - 10445

EP - 10449

JO - Physical Chemistry Chemical Physics

JF - Physical Chemistry Chemical Physics

SN - 1463-9076

ER -