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

H photoluminescence

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19 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

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Luminescence
Photoluminescence
luminescence
photoluminescence
Electrons
Amorphous carbon
Optical band gaps
Ellipsometry
Band structure
excitation
emission spectra
ellipsometry
energy
carbon

Keywords

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

ASJC Scopus subject areas

  • Ceramics and Composites
  • Electronic, Optical and Magnetic Materials

Cite this

@article{576a3eac94ee41f5a1c20829104c0712,
title = "Size of spatial confinement at luminescence centers determined from resonant excitation bands of a-C: H photoluminescence",
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.",
keywords = "Amorphous semiconductors, Diamond-like carbon, Luminescence, Nano-clusters, Short-range order",
author = "M. F{\"u}le and J. Budai and S. T{\'o}th and M. Veres and M. Ko{\'o}s",
year = "2006",
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doi = "10.1016/j.jnoncrysol.2005.11.087",
language = "English",
volume = "352",
pages = "1340--1343",
journal = "Journal of Non-Crystalline Solids",
issn = "0022-3093",
publisher = "Elsevier",
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TY - JOUR

T1 - Size of spatial confinement at luminescence centers determined from resonant excitation bands of a-C

T2 - H photoluminescence

AU - Füle, M.

AU - Budai, J.

AU - Tóth, S.

AU - Veres, M.

AU - Koós, M.

PY - 2006/6/15

Y1 - 2006/6/15

N2 - 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.

AB - 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.

KW - Amorphous semiconductors

KW - Diamond-like carbon

KW - Luminescence

KW - Nano-clusters

KW - Short-range order

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U2 - 10.1016/j.jnoncrysol.2005.11.087

DO - 10.1016/j.jnoncrysol.2005.11.087

M3 - Article

VL - 352

SP - 1340

EP - 1343

JO - Journal of Non-Crystalline Solids

JF - Journal of Non-Crystalline Solids

SN - 0022-3093

IS - 9-20 SPEC. ISS.

ER -