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

Samvit G. Menon, K. S. Choudhari, S. A. Shivashankar, C. Santhosh, Suresh D. Kulkarni

Research output: Contribution to journalArticle

12 Citations (Scopus)

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 4A2g4T1g and 4A2g4T2g 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.

Original languageEnglish
Pages (from-to)484-489
Number of pages6
JournalJournal of Alloys and Compounds
Volume728
DOIs
Publication statusPublished - 25-12-2017

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All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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