Cr-doped ZnAl2O4

Microwave solution route for ceramic nanoparticles from metalorganic complexes in minutes

Deepak N. Hebbar, Samvit G. Menon, Khoobaram S. Choudhari, Srinivasrao A. Shivashankar, Chidangil Santhosh, Suresh D. Kulkarni

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

A combination of microwave irradiation and metalorganic precursors in solution was used for the synthesis of Cr:ZnAl2O4 nanoparticles with high yields (~92%). Though the spinel phase is formed after ~40 minutes, 60 minutes of microwave irradiation was required for the complete transformation of precursors into the spinel. The as-prepared material is nanocrystalline and phase-pure and was subjected to annealing in air at different temperatures. Annealing improved the crystallinity, and the material turned pink at 1200°C. The structural and optical properties were investigated by XRD, HR-TEM, FE-SEM, FT-IR, diffuse reflectance spectroscopy, and photoluminescence spectroscopy. The two bands in the excitation spectra (400 and 540 nm) became more intense as the annealing temperature was raised. The 400 nm band was asymmetric and consisted of two peaks, suggesting a trigonal distortion. The emission spectra consisted of a zero phonon line (ZPL), along with its associated multi-phonon side bands. The high Dq/B (3.21) suggested the presence of Cr3+ in a strong crystal field. With annealing, the emission lifetimes increased from ~7 to ~34 ms. This work demonstrates rapid, low-temperature synthesis of a red-emitting phosphor, with potential applications in bio-imaging, sensors, and lighting.

Original languageEnglish
Pages (from-to)800-811
Number of pages12
JournalJournal of the American Ceramic Society
Volume101
Issue number2
DOIs
Publication statusPublished - 01-02-2018

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annealing
ceramics
Microwaves
Annealing
Nanoparticles
Microwave irradiation
spinel
irradiation
spectroscopy
Nanocrystalline materials
Photoluminescence spectroscopy
crystallinity
optical property
Phosphors
Temperature
Structural properties
transmission electron microscopy
reflectance
Optical properties
Lighting

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Geology
  • Geochemistry and Petrology
  • Materials Chemistry

Cite this

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title = "Cr-doped ZnAl2O4: Microwave solution route for ceramic nanoparticles from metalorganic complexes in minutes",
abstract = "A combination of microwave irradiation and metalorganic precursors in solution was used for the synthesis of Cr:ZnAl2O4 nanoparticles with high yields (~92{\%}). Though the spinel phase is formed after ~40 minutes, 60 minutes of microwave irradiation was required for the complete transformation of precursors into the spinel. The as-prepared material is nanocrystalline and phase-pure and was subjected to annealing in air at different temperatures. Annealing improved the crystallinity, and the material turned pink at 1200°C. The structural and optical properties were investigated by XRD, HR-TEM, FE-SEM, FT-IR, diffuse reflectance spectroscopy, and photoluminescence spectroscopy. The two bands in the excitation spectra (400 and 540 nm) became more intense as the annealing temperature was raised. The 400 nm band was asymmetric and consisted of two peaks, suggesting a trigonal distortion. The emission spectra consisted of a zero phonon line (ZPL), along with its associated multi-phonon side bands. The high Dq/B (3.21) suggested the presence of Cr3+ in a strong crystal field. With annealing, the emission lifetimes increased from ~7 to ~34 ms. This work demonstrates rapid, low-temperature synthesis of a red-emitting phosphor, with potential applications in bio-imaging, sensors, and lighting.",
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Cr-doped ZnAl2O4 : Microwave solution route for ceramic nanoparticles from metalorganic complexes in minutes. / Hebbar, Deepak N.; Menon, Samvit G.; Choudhari, Khoobaram S.; Shivashankar, Srinivasrao A.; Santhosh, Chidangil; Kulkarni, Suresh D.

In: Journal of the American Ceramic Society, Vol. 101, No. 2, 01.02.2018, p. 800-811.

Research output: Contribution to journalArticle

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AU - Hebbar, Deepak N.

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AU - Shivashankar, Srinivasrao A.

AU - Santhosh, Chidangil

AU - Kulkarni, Suresh D.

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