A promising orange-red emitting nanocrystalline NaCaBO3:Sm3+ phosphor for solid state lightning

A. K. Bedyal, Vinay Kumar, O. M. Ntwaeaborwa, H. C. Swart

Research output: Contribution to journalArticlepeer-review

63 Citations (Scopus)

Abstract

Orange-red emitting NaCaBO3:Sm3+ nanophosphors were prepared by combustion method using metal nitrates and urea as initial materials. The phase of the product was identified by x-ray diffraction technique (XRD) and was found to be orthorhombic with a space group Pmmn and lattice parameters a = 16.12 Å, b = 10.25 Å, c = 3.52 Å and V= 581.60 Å3 calculated with the POWD program. The average particle size of the nanophosphor calculated from the XRD data and cross verified by TEM was 34 nm. The spectral properties of the NaCaBO3: Sm3+ nanophosphors were studied under near UV and electron excitation, which shows characteristic emission lines assigned to the transition (4G5/2 to the 6Hj, j = 5/2, 7/2, 9/2, 11/2) of the Sm3+ ion. The optimal Sm3+ ion concentration and its critical energy distance were determined as x = 2 mol% and 59.97 Å, respectively and the dipole-dipole interactions were responsible for concentration quenching in the present phosphor. The band gap of the phosphor was calculated to be 5.82 eV. The phosphorescence decay curve was also measured.

Original languageEnglish
Article number015006
JournalMaterials Research Express
Volume1
Issue number1
DOIs
Publication statusPublished - Mar 2014
Externally publishedYes

Keywords

  • Combustion synthesis
  • Lightemitting diodes
  • Luminescence of inorganic solids
  • XRD

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Surfaces, Coatings and Films
  • Polymers and Plastics
  • Metals and Alloys

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