Investigations on the low voltage cathodoluminescence stability and surface chemical behaviour using Auger and X-ray photoelectron spectroscopy on LiSrBO3:Sm3+ phosphor

Shreyas S. Pitale, I. M. Nagpure, Vinay Kumar, O. M. Ntwaeaborwa, J. J. Terblans, H. C. Swart

Research output: Contribution to journalArticlepeer-review

52 Citations (Scopus)

Abstract

Orange-red emissive LiSrBO3:Sm3+ phosphors were synthesized through the solid-state reaction method. Under UV radiation (221 nm) and low-voltage electron beam (2 keV, 12 mA/cm2) excitation, the Sm3+ doped LiSrBO3 phosphor shows emission corresponding to the characteristic 4G5/2-6H7/2 transitions of Sm3+ with the strongest emission at 601 nm. A high stability of cathodoluminescence (CL) emission during prolong electron bombardment with low-energy electrons was observed. Surface sensitive diagnostic tools such as Auger electron spectroscopy (AES) and X-ray photoelectron spectroscopy (XPS) were used to study the surface chemistry. AES results revealed modifications in the surface concentrations of Li, Sr, B, O and C on the surface of the LiSrBO3:Sm3+ phosphor as indicated by the changes in their Auger peak to peak heights (APPH) as a function of electron dose. Observed changes in the high resolution XPS spectra of the LiSrBO 3:Sm3+ surface irradiated with the low energy electron beam provide evidence of compositional and structural changes as a result of the electron beam stimulated surface chemical reactions (ESSCRs). Additional SrO2 was identified by XPS on the phosphor surface after it received an electron dose of 300 C/cm2 together with the increase in the concentrations of chemical species containing the B-C-O bonding. The new surface chemical species formed during electron beam bombardment are possibly responsible for the stability of the CL in the LiSrBO3:Sm 3+ phosphor.

Original languageEnglish
Pages (from-to)987-994
Number of pages8
JournalMaterials Research Bulletin
Volume46
Issue number7
DOIs
Publication statusPublished - Jul 2011
Externally publishedYes

Keywords

  • Auger electron spectroscopy
  • Cathodoluminescence degradation
  • ESSCR
  • LiSrBO
  • X-ray photoelectron spectroscopy

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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