Synthesis and investigation of energy transfer mechanism in Sm3+ and Eu3+ doped Na6Mg(SO4)4 nanophosphors via solution combustion technique

K. B. Morebodi, L. Reddy, M. L.A. Letswalo, A. Balakrishna, L. J.B. Erasmus, H. C. Swart, P. L. Masiteng

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Singly doped Sm3+(1.0 mol%), Eu3+(1.0 mol%) and co-doped Na6Mg(SO4)4:Sm3+/Eu3+ nanophosphors with a fixed Sm3+(1 mol%) concentration and different Eu3+ (x = 0.5%, 1.0 and 1.5 mol%) concentration were synthesized using the chemical combustion method at a temperature of 580 0C. Structural, morphological and optical properties were studied using different characterization techniques. X-ray diffraction confirmed the crystal structure of the Na6Mg(SO4)4 nanophosphors to be monoclinic with different space groupings. The optical bandgap of the Na6Mg(SO4)4 nanophosphors were calculated from the Kubelka-Munk function using optical data and a decrease in the bandgap after adding Sm3+ and Eu3+ dopants was obtained. The photoluminescence was measured with two different 404 and 395 nm excitation wavelengths, both from the Sm3+ and Eu3+ spectra, respectively. An improvement of the color tunability was observed in the co-doped Na6Mg(SO4)4 nanophosphors, with an energy transfer from Sm3+ to Eu3+. The color purity of all the nanophosphors was analyzed using the CIE-1931 color chromaticity, which all confirmed red color emission. These luminescence results proved that the prepared nanophosphors are suitable to be used in display and light emitting diodes applications.

Original languageEnglish
JournalInorganic and Nano-Metal Chemistry
DOIs
Publication statusAccepted/In press - 2022

Keywords

  • CIE
  • Eu ion
  • LEDs
  • Sm ion
  • photoluminescence (PL) excitation spectra
  • red emission

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry

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