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Cr-doped ZnAl2O4: Microwave solution route for ceramic nanoparticles from metalorganic complexes in minutes

Hebbar, Deepak N and Menon, Samvit G and Choudhari, Khoobaram S and Shivashankar, Srinivasrao A and Santhosh, Chidangil and Kulkarni, Suresh D (2018) Cr-doped ZnAl2O4: Microwave solution route for ceramic nanoparticles from metalorganic complexes in minutes. In: JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 101 (2). pp. 800-811.

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Official URL: http://dx.doi.org/10.1111/jace.15256


A combination of microwave irradiation and metalorganic precursors in solution was used for the synthesis of Cr:ZnAl2O4 nanoparticles with high yields (similar to 92%). Though the spinel phase is formed after similar to 40minutes, 60minutes 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 degrees 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 540nm) became more intense as the annealing temperature was raised. The 400nm 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 similar to 7 to similar to 34ms. This work demonstrates rapid, low-temperature synthesis of a red-emitting phosphor, with potential applications in bio-imaging, sensors, and lighting.

Item Type: Journal Article
Additional Information: Copy right for this article belongs to the WILEY, 111 RIVER ST, HOBOKEN 07030-5774, NJ USA
Department/Centre: Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Date Deposited: 23 Dec 2017 08:31
Last Modified: 23 Dec 2017 08:31
URI: http://eprints.iisc.ac.in/id/eprint/58496

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