Porous Silicon Bragg reflector/Carbon dot hybrids: Synthesis, nanostructure, and optical properties

Naama Massad-Ivanir, Susanta Kumar Bhunia, Raz Jelinek, Ester Segal

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

Carbon dots (C-dots) exhibit unique fluorescence properties, mostly depending upon their physical environments. Here we investigate the optical properties and nanostructure of Carbon dots (C-dots) which are synthesized in situ within different porous Silicon (PSi) Bragg reflectors. The resulting hybrids were characterized by photoluminescence, X-ray photoelectron, and Fourier Transform Infrared spectroscopies, as well as by confocal and transmission electron microscopy. We show that by tailoring the location of the PSi Bragg reflector photonic bandgap and its oxidation level, the C-dots emission spectral features can be tuned. Notably, their fluorescence emission can be significantly enhanced when the high reflection band of the PSi host overlaps with the confined C-dots' peak wavelength, and the PSi matrix is thermally oxidized at mild conditions. These phenomena are observed for multiple compositions of PSi Bragg reflectors/C-dots hybrids.

Original languageEnglish
Article number574
JournalFrontiers in Chemistry
Volume6
Issue numberNOV
DOIs
StatePublished - 1 Nov 2018

Keywords

  • Bragg reflectors
  • Carbon dots
  • Fabry-Pérot
  • Fluorescence
  • Optical properties
  • Photoluminescence
  • Porous silicon

ASJC Scopus subject areas

  • General Chemistry

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