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 Santhosh, Chidangil and Kulkarni, Suresh D (2018) Cr-doped ZnAl2O4: Microwave Solution Route for Ceramic Nanoparticles from Metalorganic Complexes in Minutes. Journal of the American Ceramic Society, 101. pp. 800-811. ISSN 0002-7820

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

Item Type: Article
Uncontrolled Keywords: Luminescence; Microwaves; Nanoparticles; Phosphors; Spinels
Subjects: Departments at MU > Atomic Molecular Physics
Depositing User: KMC Library
Date Deposited: 29 Jan 2018 09:11
Last Modified: 29 Jan 2018 09:11

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