Sensitizing effects of ZnO quantum dots on red-emitting Pr 3+-doped SiO 2 phosphor

P. S. Mbule, G. H. Mhlongo, Shreyas S. Pitale, H. C. Swart, O. M. Ntwaeaborwa

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)


In this study, red cathodoluminescence (CL) (λ emission= 614 nm) was observed from Pr 3+ ions in a glassy (amorphous) SiO 2 host. This emission was enhanced considerably when ZnO quantum dots (QDs) were incorporated in the SiO 2:Pr 3+ suggesting that the ZnO QDs transferred excitation energy to Pr 3+ ions. That is, ZnO QDs acted to sensitize the Pr 3+ emission. The solgel method was used to prepare ZnOSiO 2:Pr 3+ phosphors with different molar ratios of Zn to Si. The effects of the ZnO QDs concentration and the possible mechanisms of energy transfer from ZnO to Pr 3+ are discussed. In addition, the electronic states and the chemical composition of the ZnOSiO 2:Pr 3+ phosphors were analyzed using X-ray photoelectron spectroscopy (XPS).

Original languageEnglish
Pages (from-to)1607-1610
Number of pages4
JournalPhysica B: Condensed Matter
Issue number10
Publication statusPublished - 15 May 2012
Externally publishedYes


  • Absorption
  • Cathodoluminescence
  • Phosphor
  • Quantum dots

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


Dive into the research topics of 'Sensitizing effects of ZnO quantum dots on red-emitting Pr 3+-doped SiO 2 phosphor'. Together they form a unique fingerprint.

Cite this