Size of spatial confinement at luminescence centers determined from resonant excitation bands of a-C:H photoluminescence

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

The photoluminescence (PL) emission and excitation spectra of hydrogenated amorphous carbon (a-C:H) were analyzed. The emission spectrum was experimentally deconvoluted for three bands in the green region (2.26 eV, 2.48 eV, 2.67 eV). The luminescence excitation spectrum of these emission bands shows two bands structures and a resonance feature. The spatially localized electron hole pairs are responsible for this resonance excitation feature. Combining these results with those of ellipsometry measurements concerning the optical band gap, the length of the spatially confined electron hole pair localization was calculated. We found that this length varies with the energy of the PL emission. With increasing emission energy the size of the localization changes from 1.15 nm to 0.94 nm.

Original languageEnglish
Pages (from-to)1340-1343
Number of pages4
JournalJournal of Non-Crystalline Solids
Volume352
Issue number9-20 SPEC. ISS.
DOIs
Publication statusPublished - Jun 15 2006

    Fingerprint

Keywords

  • Amorphous semiconductors
  • Diamond-like carbon
  • Luminescence
  • Nano-clusters
  • Short-range order

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Materials Chemistry

Cite this