Singlet oxygen generation by nanoporous silicon: photoluminescence dynamics in magnetic field

Gazimagomed Aliev, Jamaree Amonkosolpan, Daniel Wolverson

Research output: Contribution to journalArticle

Abstract

Singlet oxygen generation in porous silicon (PSi) was investigated by a magneto-optical experiment. Photoluminescence (PL) quenching due to an energy transfer (ET) process mediated by an exchange interaction was monitored in the spectral range 1.4-2.5 eV and in a magnetic field of 0-6 Tesla at different levels of oxygen concentration and excitation pump power. When a magnetic field was applied, both PL recovery and, for magnetic fields below 2 Tesla and high concentrations of oxygen, an unusual additional pump power dependent quenching of the PL was observed. A rate equation model describing the behavior of PL from PSi with oxygen adsorbed at cryogenic temperatures in magnetic field was developed. The model has been expanded to cover the ET process as a function of the nanoparticle size.

Original languageEnglish
Pages (from-to)1-13
Number of pages13
JournalNanotechnology
Volume31
Issue number3
DOIs
Publication statusPublished - 18 Oct 2019

Keywords

  • Porous silicon
  • singlet oxygen
  • energy transfer
  • photoluminescence
  • photosensitizing

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Electrical and Electronic Engineering

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