Effect of alkali metal ions (Li+, Na+ and K+) on the luminescence properties of CaMgB2O5: Sm3+ nanophosphor

M. Manhas, Vinay Kumar, Visha Sharma, O. M. Ntwaeaborwa, H. C. Swart

Research output: Contribution to journalArticlepeer-review

43 Citations (Scopus)

Abstract

A series of CaMgB2O5 phosphors co-doped with Sm3+ and alkali metal ions (Li+, Na+ and K+) were prepared by combustion method. The crystal structure of the phosphors was investigated by using X-ray diffraction (XRD) after annealing the phosphor at 900 °C. The crystal structure belongs to the monoclinic phase of CaMgB2O5with space group P21/b. FTIR spectra shows the absorption bands for various structural units of borate mainly BO3 triangles and lattice vibrations of Ca-O and Mg-O. The luminescence and spectral properties were studied by photoluminescence (PL) and diffuse reflectance (DR) spectroscopy. The result shows that under 400 nm excitation, the phosphor shows characteristic emission of Sm3+ ion with the main orange-red peak at 600 nm. The optimum dopant concentration of Sm3+ ion was 1.5 mol% and the main mechanism for concentration quenching was dipole-dipole (d-d) interaction determined by using Dexter's theory. As a charge compensator, alkali metal ions (Li+, Na+ and K+) were incorporated into the host lattice of CaMgB2O5: Sm3+ phosphors, which enhanced the PL intensities. The calculated CIE coordinates (0.59, 0.41) under 400 nm excitation were found to be in the orange-red region of the spectrum.

Original languageEnglish
Pages (from-to)9-16
Number of pages8
JournalNano-Structures and Nano-Objects
Volume3
DOIs
Publication statusPublished - 1 Oct 2015
Externally publishedYes

Keywords

  • Alkali metal ions
  • Borates
  • Charge compensation
  • Photoluminescence

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • General Materials Science
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

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