Structure and photoluminescent properties of green-emitting terbium-doped GdV1−xPxO4 phosphor prepared by solution combustion method

S. J. Motloung*, S. K.K. Shaat, K. G. Tshabalala, O. M. Ntwaeaborwa

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

Terbium-doped gadolinium orthovanadate (GdVO4:Tb3+), orthophosphate monohydrate (GdPO4·H2O:Tb3+) and orthovanadate–phosphate (GdV,PO4:Tb3+) powder phosphors were synthesized using a solution combustion method. X-Ray diffraction analysis confirmed the formation of crystalline GdVO4, GdPO4·H2O and GdV,PO4. Scanning electron microscopy images showed that the powder was composed of an agglomeration of particles of different shapes, ranging from spherical to oval to wire-like structures. The chemical elements present were confirmed by energy dispersive spectroscopy, and the stretching mode frequencies were determined by Fourier transform infrared spectroscopy. UV–visible spectroscopy spectra showed a strong absorption band with a maximum at 200 nm assigned to the absorption of VO43− and minor excitation bands assigned to f → f transitions of Tb3+. Four characteristic emission peaks were observed at 491, 546, 588 and 623 nm, and are attributed to 5D47Fj (j = 6, 5, 4 and 3). The photoluminescent prominent green emission peak (5D47F5) was centred at 546 nm. The structure and possible mechanism of light emission from GdV1−xPxO4:% Tb3+ are discussed.

Original languageEnglish
Pages (from-to)1069-1076
Number of pages8
JournalLuminescence
DOIs
Publication statusPublished - 1 Aug 2016
Externally publishedYes

Keywords

  • combustion synthesis
  • orthovanadate phosphates
  • phosphors
  • photoluminescence

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