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

TitleRapid annealing: A novel processing technique for Cr: ZnAl2O4 nanoparticles
Publication TypeJournal Article
Year of Publication2017
AuthorsMenon, SG, Choudhari, KS, Shivashankar, SA, Santhosh, C, Kulkarni, SD
JournalJournal of Alloys and Compounds
Keywordsceramics, luminescence, nanofabrication, Nanostructured materials, Optical properties

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 °C and 700 °C had smaller crystallites (∼2.4 – 4 nm), while at 800 °C and 900 °C, had ∼10 nm crystallites. HRTEM images of the 900 °C sample showed the well-developed lattice fringes confirming the high crystallinity. The particles were polyhedral having an average size of ∼16 nm. The diffuse reflectance spectra showed characteristic 4A2g → 4T1g and 4A2g → 4T2gtransitions, 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.