Title | Rapid annealing: A novel processing technique for Cr: ZnAl2O4 nanoparticles |
Publication Type | Journal Article |
Year of Publication | 2017 |
Authors | Menon, SG, Choudhari, KS, Shivashankar, SA, Santhosh, C, Kulkarni, SD |
Journal | Journal of Alloys and Compounds |
Volume | 728 |
Pagination | 484–489 |
Keywords | ceramics, luminescence, nanofabrication, Nanostructured materials, Optical properties |
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 °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. |
DOI | 10.1016/j.jallcom.2017.09.026 |