Photoluminescence and thermoluminescence properties of Pr3+ doped ZnTa2O6 phosphor

L. L. Noto, M. L. Chitambo, O. M. Ntwaeaborwa, H. C. Swart

Research output: Contribution to journalArticlepeer-review

31 Citations (Scopus)

Abstract

A new red long afterglow ZnTa2O6 : Pr3+ phosphor was prepared by solid state reaction at 1200°C. An orthorhombic single phase was obtained, as identified by X-ray diffraction (XRD). The scanning electron microscopy (SEM) images showed that particles were spherical and the crystallite sizes were calculated to be 270nm using Scherrer's equation. Both blue and red emissions were obtained from the ZnTa2O6 : Pr3+ powder. The blue spectral line from the 3P03H4 transition was observed at 448nm and the more prominent red spectral lines were observed at 608, 619 and 639nm from the 1D23H4, 3P03H6 and 3P03F2 transitions, respectively. The main absorption occurred at 259nm (4.6eV). This was confirmed to be due to band to band excitation. The energy band gap (Eg) was calculated to be 4.43±0.02eV. The phosphorescence decay characteristics were measured and the decay times and the depth of the electron trapping centers were calculated.

Original languageEnglish
Pages (from-to)147-150
Number of pages4
JournalPowder Technology
Volume247
DOIs
Publication statusPublished - Oct 2013
Externally publishedYes

Keywords

  • Electron trap distribution
  • Praseodymium red emission
  • Red long afterglow
  • ZnTaO : Pr

ASJC Scopus subject areas

  • General Chemical Engineering

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