X-ray photoelectron spectroscopy and luminescent properties of Y 2 O 3 :Bi 3+ phosphor

R. M. Jafer, E. Coetsee, A. Yousif, R. E. Kroon, O. M. Ntwaeaborwa, H. C. Swart

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48 Citations (Scopus)

Abstract

X-ray photoelectron spectroscopy (XPS) results provided proof for the blue and green emission of Bi 3+ in the Y 2 O 3 :Bi 3+ phosphor. The Y 2 O 3 :Bi 3+ phosphor was successfully prepared by the combustion process during the investigation of down-conversion materials for Si solar cell application. The X-ray diffraction (XRD) patterns indicated that a single-phase cubic crystal structure with the Ia3 space group was formed. X-ray photoelectron spectroscopy (XPS) showed that the Bi 3+ ion replaces the Y 3+ ion in two different coordination sites in the Y 2 O 3 crystal structure. The O 1s peak shows five peaks, two which correlate with the O 2- ion in Y 2 O 3 in the two different sites, two which correlate with O 2- in Bi 2 O 3 in the two different sites and the remaining peak relates to hydroxide. The Y 3d spectrum shows two peaks for the Y 3+ ion in the Y 2 O 3 structure in two different sites and the Bi 4f spectrum shows the Bi 3+ ion in the two different sites in Bi 2 O 3 . The photoluminescence (PL) results showed three broad emission bands in the blue and green regions under ultraviolet excitation, which were also present for panchromatic cathodoluminescence (CL) results. These three peaks have maxima at ∼3.4, 3.0 and 2.5 eV. The PL emission ∼3.0 eV (blue emission) showed two excitation bands centered at ∼3.7 and 3.4 eV while the PL emission at ∼2.5 eV (green emission) showed a broad excitation band from ∼4 to 3.4 eV. The panchromatic CL images were obtained for selected wavelengths at (2.99 ± 0.08) eV (for blue emission) and (2.34 ± 0.06) eV (for green emission). These luminescence results correlate with the XPS results that show that there are two different Bi 3+ sites in the host lattice.

Original languageEnglish
Pages (from-to)198-204
Number of pages7
JournalApplied Surface Science
Volume332
DOIs
Publication statusPublished - 30 Mar 2015
Externally publishedYes

Keywords

  • Cathodoluminescence
  • False-color CL image
  • X-ray photoelectron spectroscopy
  • Y O :Bi

ASJC Scopus subject areas

  • General Chemistry
  • Condensed Matter Physics
  • General Physics and Astronomy
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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