@article{8680377,
  abstract     = {{A simple recipe for synthesizing green emitting Mn2+-doped ZnAl2O4 phosphor has been developed. Metal-organic complexes, with their unique properties, were employed as precursors to obtain phase-pure, nanocrystalline material in the as-prepared form within just 5 min of microwave irradiation. The Mn2+ doping concentration that showed the highest photoluminescence (PL) intensity was optimized and a comprehensive investigation of the structural and optical properties were made for various annealing temperatures. Rietveld refinement of the samples annealed at 1200 °C and 1400 °C, showed that the cationic inversion in the spinel decreased from 3.4 to 2.1% and this change was validated by the X-ray photoelectron spectroscopy results. XPS confirmed that the inversion for Zn2+, Al3+, and Mn2+ cations decreased with annealing temperature, despite of which, inversion remained at 20%, 10%, and 15%, respectively for the sample annealed at 1400 °C, emphasizing the fact that synthesis plays an important role in controlling the amount of inversion in an otherwise normal spinel. Electron paramagnetic resonance spectra of the as-prepared and the samples annealed at high temperatures confirmed that the Mn2+ hyperfine spectrum was not just a function of the crystal field environment but also strongly depends on the doping concentration. The PL spectrum taken at different annealing temperatures, comprised of the characteristic 4T1 (G) → 6A1 (S) spin-forbidden Mn2+ transitions, showed that the emission intensity depends on the material crystallinity. The sample annealed at 1400 °C displayed a significantly higher PL intensity compared to those annealed at lower temperatures. The variation of PL spectrum of this sample was investigated between 9 K and 300 K to determine the origins of the asymmetry at room temperature and the vibrational sidebands at lower temperatures. The energy levels of the Mn2+ dopant, calculated theoretically and verified experimentally, were used to determine the spectroscopic parameters such as the Racah B and C values and the crystal field energy, Dq. These values showed that the Mn2+ was in a weak tetrahedral field. This work demonstrates a technologically important, green, and swift technique in synthesizing phosphors for various applications in displays, bioimaging, solid state lighting, etc.}},
  articleno    = {{117482}},
  author       = {{Menon, Samvit G. and Kunti, Arup K. and Kulkarni, Suresh D. and Kumar, Raju and Jain, Mayank and Poelman, Dirk and Joos, Jonas and Swart, Hendrik C.}},
  issn         = {{0022-2313}},
  journal      = {{JOURNAL OF LUMINESCENCE}},
  keywords     = {{ELECTRON-SPIN-RESONANCE,SOLUTION ROUTE,EPR-SPECTRA,THIN-FILMS,NANOPARTICLES,MN2+,FLUORESCENCE,SPECTROSCOPY,INVERSION}},
  language     = {{eng}},
  pages        = {{10}},
  title        = {{A new microwave approach for the synthesis of green emitting Mn2+-doped ZnAl2O4 : a detailed study on its structural and optical properties}},
  url          = {{http://doi.org/10.1016/j.jlumin.2020.117482}},
  volume       = {{226}},
  year         = {{2020}},
}

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