Optical properties of undoped and cobalt doped ZnS nanophosphor

C. S. Pathak, M. K. Mandal, V. Agarwala

Research output: Contribution to journalArticlepeer-review

18 Scopus citations


In the present study, the optical properties of ZnS and cobalt (Co) doped ZnS nanoparticles were investigated at room temperature. ZnS and ZnS:Co nanophosphors were prepared through chemical route, namely the chemical precipitation method and the formation of the nanoparticles were confirmed by X-ray diffraction and field emission scanning electron microscope (FESEM). Band gap energy of the prepared samples is determined by using a UV-vis-NIR spectrophotometer. The photoluminescence property of ZnS and ZnS:Co sample is determined by fluorescence spectroscopy. The sizes of as prepared nanoparticles are found to be in the 8-9 nm range. The FESEM morphology shows the formation of nanostructure of ZnS samples. The value of optical band gap has been found to be in the range 4.30-4.03 eV. Room temperature photoluminescence (PL) spectrum of the undoped sample exhibits emission in the blue region with multiple peaks under UV excitation. On the other hand, Co2+ doped ZnS samples show enhanced visible light emissions under the same UV excitation wavelength of 310 nm.

Original languageEnglish
Pages (from-to)467-471
Number of pages5
JournalMaterials Science in Semiconductor Processing
Issue number2
StatePublished - 1 Apr 2013
Externally publishedYes


  • Band gap
  • Optical absorption
  • Photoluminescence properties
  • Semiconductors nanoparticles

ASJC Scopus subject areas

  • Materials Science (all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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