Scholarlink

<p>The un-doped CaF<sub>2</sub> and Dy<sup>3+</sup> ion doped CaF<sub>2</sub> Nanoparticles were chemically synthesized following the solution combustion method using calcium nitrate, Ca(NO<sub>3</sub>)<sub>2</sub> (99.9%, Sigma Aldrich) as the source of calcium, NH<sub>4</sub>F (99.9%, Sigma Aldrich) as the source of fluoride and Dy<sub>2</sub>O<sub>3</sub> (99.9%, Sigma Aldrich) as the source of dysprosium respectively. The average crystallite size of un-doped CaF<sub>2</sub> nanoparticles was found to be 15.76&#xa0;nm and that of CaF<sub>2</sub>:Dy<sup>3+</sup> nanoparticles was found to be 32.04&#xa0;nm. The variation of crystallite size of the samples on doping of Dy<sup>3+</sup> ion was revealed from XRD analysis. The Rietveld refinement analysis of CaF<sub>2</sub>:Dy<sup>3+</sup> nanoparticles has been also done to confirm the retention of cubic fluoride structure in it. The formation of Nano spheroids was also confirmed from the study of surface morphology by FESEM. The absence of impurities in the prepared powder samples was confirmed by EDAX analysis. The band gap energy of un-doped CaF<sub>2</sub> nanoparticles was found to be 3.87&#xa0;eV and that of CaF<sub>2</sub>:Dy<sup>3+</sup> nanoparticles was found to be 1.80&#xa0;eV. The optical study revealed the transition of band gap of CaF<sub>2</sub> from direct to indirect band gap on doping of Dy<sup>3+</sup> ions indicating its applicability in optoelectronics to design photodetector. The Urbach energies of CaF<sub>2</sub> and CaF<sub>2</sub>:Dy<sup>3+</sup>nanoparticles were found to be 2.33&#xa0;eV and 0.15&#xa0;eV respectively. As the PL emission peaks of un-doped CaF<sub>2</sub> and CaF<sub>2</sub>:Dy<sup>3+</sup> nanoparticles were observed around 420&#xa0;nm and 480&#xa0;nm, 573&#xa0;nm respectively, the photoluminescence study also explored the applicability of the synthesized samples as potential material for fabrication of violet and white light laser.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Investigation of the Optical and Photoluminescence Properties of CaF2: Dy3+ Nanoparticles Synthesized Via Solution Combustion Method for Optoelectronic Applications

  • 期刊论文

  • 发表日期：

    2025年8月5日

查看全文
  • N. Sushilal Devi,
  • M. R. Shiekh,
  • L. Raghumani Singh,
  • A. Nabachandra Singh

摘要

The un-doped CaF2 and Dy3+ ion doped CaF2 Nanoparticles were chemically synthesized following the solution combustion method using calcium nitrate, Ca(NO3)2 (99.9%, Sigma Aldrich) as the source of calcium, NH4F (99.9%, Sigma Aldrich) as the source of fluoride and Dy2O3 (99.9%, Sigma Aldrich) as the source of dysprosium respectively. The average crystallite size of un-doped CaF2 nanoparticles was found to be 15.76 nm and that of CaF2:Dy3+ nanoparticles was found to be 32.04 nm. The variation of crystallite size of the samples on doping of Dy3+ ion was revealed from XRD analysis. The Rietveld refinement analysis of CaF2:Dy3+ nanoparticles has been also done to confirm the retention of cubic fluoride structure in it. The formation of Nano spheroids was also confirmed from the study of surface morphology by FESEM. The absence of impurities in the prepared powder samples was confirmed by EDAX analysis. The band gap energy of un-doped CaF2 nanoparticles was found to be 3.87 eV and that of CaF2:Dy3+ nanoparticles was found to be 1.80 eV. The optical study revealed the transition of band gap of CaF2 from direct to indirect band gap on doping of Dy3+ ions indicating its applicability in optoelectronics to design photodetector. The Urbach energies of CaF2 and CaF2:Dy3+nanoparticles were found to be 2.33 eV and 0.15 eV respectively. As the PL emission peaks of un-doped CaF2 and CaF2:Dy3+ nanoparticles were observed around 420 nm and 480 nm, 573 nm respectively, the photoluminescence study also explored the applicability of the synthesized samples as potential material for fabrication of violet and white light laser.