Rapid annealing: A novel processing technique for Cr:ZnAl2O4 nanoparticles

Menon, Samvit G and Choudhari, KS and Shivashankar, SA and Santhosh, C and Kulkarni, Suresh D (2017) Rapid annealing: A novel processing technique for Cr:ZnAl2O4 nanoparticles. In: JOURNAL OF ALLOYS AND COMPOUNDS, 728 . pp. 484-489.

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Abstract

Nanocrystalline Cr: ZnAl2O4 was synthesized for the first time by rapid thermal annealing the corresponding hydroxide precipitate in just 10 min. The XRD patterns showed that synthesis between 500 degrees C and 700 degrees C had smaller crystallites (similar to 2.4 - 4 nm), while at 800 degrees C and 900 degrees C, had similar to 10 nm crystallites. HRTEM images of the 900 degrees C sample showed the well-developed lattice fringes confirming the high crystallinity. The particles were polyhedral having an average size of similar to 16 nm. The diffuse reflectance spectra showed characteristic (4)A(2g) -> T-4(1g) and (4)A(2g) -> T-4(2g) transitions, while the photoluminescence emission spectrum comprised of the zero phonon line (R-line) along with other multi-phonon side bands that are characteristic of the spin - parity forbidden transitions of the Cr3+ ion. The emission spectra and photoluminescence lifetimes are comparable with reports on sensing and imaging applications. Our work demonstrates the suitability of this technique to quickly synthesise phosphors for a variety of applications. (C) 2017 Elsevier B. V. All rights reserved.

Item Type:	Journal Article
Publication:	JOURNAL OF ALLOYS AND COMPOUNDS
Additional Information:	Copy right for this article belongs to the ELSEVIER SCIENCE SA, PO BOX 564, 1001 LAUSANNE, SWITZERLAND
Department/Centre:	Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Date Deposited:	03 Nov 2017 10:54
Last Modified:	01 Mar 2019 07:48
URI:	http://eprints.iisc.ac.in/id/eprint/58132

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