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      https://www.ias.ac.in/article/fulltext/boms/038/05/1359-1365

    • Keywords

       

      Solution combustion synthesis; PXRD; SEM; photoluminescence; thermoluminescence; UV–visible spectroscopy.

    • Abstract

       

      ZnO : Cr3+ (1 mol%) nanophosphor is synthesized by the wet chemical solution combustion method at the temperature of 400°C. Powder X-ray diffraction results confirmed that Cr3+-doped and undoped ZnO nanophosphors exhibit hexagonal wurtzite structure. The average crystallite size calculated from Scherrer’s method is 25 nm for undoped and 14 nm for Cr3+-doped ZnO. The UV–visible absorption spectra shows red shift in Cr3+-doped ZnO. Photoluminescence studies of undoped ZnO show violet emission peak at 400 nm and blue emission peak at 447 nm. Cr3+-doped ZnO shows red emission peaks at 642, 694 and 746 nm, which are mainly attributed to spin forbidden transitions of $^2$Eg $\to {}^4$A2g of Cr3+ ion in ZnO : Cr3+ nanophosphor. Thermoluminescence (TL) studies recorded at a heating rate of 6°C s$^{–1}$ show two well-resolved glow peaks at 124 and 284°C. It is found that the TL intensity increases with the gamma irradiation dose (500 Gy–10 kGy).

    • Author Affiliations

       

      N Pushpa1 M K Kokila1 B M Nagabhushana2 H Nagabhushana3 A Jagannatha Reddy4

      1. Department of Physics, Bangalore University, Bangalore 560 056, India
      2. Department of Chemistry, M.S. Ramaiah Institute of Technology, Bangalore 560 054, India
      3. Prof. C.N.R. Rao Centre for Advanced Materials Research, Tumkur University, Tumkur 572 103, India
      4. Department of Physics, M.S. Ramaiah Institute of Technology, Bangalore 560 054, India
    • Dates

       
  • Bulletin of Materials Science | News

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