Cooperative luminescence from low temperature synthesized α-Al2O3: Yb3+ phosphor by using solution combustion

Teboho Patrick Mokoena, Ella Cebisa Linganiso, Hendrik C. Swart, Vinod Kumar, Odireleng Martin Ntwaeaborwa

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)

Abstract

Ytterbium (Yb3+) doped aluminium oxide (Al2O3) powder phosphor was successfully synthesized by solution combustion method. The structure, vibrational bending modes, particle morphology, chemical composition, and photoluminescent properties were analyzed using X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and photoluminescent (PL) spectroscopy respectively. The XRD patterns confirmed that Al2O3 crystallized in its stable polymorphic hexagonal α-Al2O3 phase with space group R3c. The average crystallite size estimated from Debye-Scherrer equation was 29 nm. The FTIR confirmed the Al-O vibrations associated with α-Al2O3 and the Yb-O vibrations. The SEM data showed that the powders were made up of particles with different shapes but well defined boundaries. Furthermore, the SEM images show that the Yb3+ ions resided on the grain boundaries. When the powders were excited using a 325 nm He-Cd laser, the emission was observed in the near infrared (NIR) at 975 nm due to the 2F5/22F7/2 transition of Yb3+. However, the bluish green emission with a maxima at ~ 480 nm was observed as a result of cooperative luminescence of Yb3+ when the powders were excited in the NIR with an excitation wavelength of 980 nm. Cooperative energy transfer (CET) mechanism producing NIR emission for the 325 nm laser excited Al2O3:Yb3+ powders is presented and discussed.

Original languageEnglish
Pages (from-to)174-181
Number of pages8
JournalCeramics International
Volume43
Issue number1
DOIs
Publication statusPublished - 1 Jan 2017
Externally publishedYes

Keywords

  • Alumina
  • Cooperative luminescence
  • Phosphors
  • Photoluminescence

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Process Chemistry and Technology
  • Surfaces, Coatings and Films
  • Materials Chemistry

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