Rapid synthesis of nanocrystalline ZnGa 2O 4 phosphor at low temperature

Suresh D. Kulkarni, S. A. Shivashankar

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)


A novel microwave-assisted synthesis technique was used for the rapid preparation of nanocrystalline ZnGa 2O 4 at two different temperatures. The crystalline spinel oxide is formed at temperatures as low as 100°C within few minutes, at a high yield of 96%, requiring no post-synthesis annealing. The as-prepared samples are polycrystalline and phase-pure as verified by XRD, with a crystallite size of ∼5 nm. Polycrystalline ZnGa 2O 4 substituted with Mn 2+, Cr 3+, Cu 2+, and Co 2+ was also similarly prepared. All samples are highly monodispersed, as measured by TEM. The ZnGa 2O 4 nanocrystals without further surface modification can be readily dispersed in chloroform to form a fully transparent colloidal solution, using which the bandgap of ZnGa 2O 4 was determined to be ∼4.5 eV. The entire synthesis procedure, including solution preparation, microwave irradiation, and centrifugation takes about 30 minutes, which is faster than any procedure reported for a complex oxide like ZnGa 2O 4, as well as one with a small thermal budget. Photoluminescence shows a broad emission extending from 330 nm to 800 nm, which is surmised to be due to the defect structure in the oxide produced.

Original languageEnglish
Title of host publicationFunctional Metal Oxide Nanostructures
Number of pages6
Publication statusPublished - 20-08-2012
Event2011 MRS Fall Meeting - Boston, MA, United States
Duration: 28-11-201102-12-2011


Conference2011 MRS Fall Meeting
Country/TerritoryUnited States
CityBoston, MA

All Science Journal Classification (ASJC) codes

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


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