Structural, Morphological and Photoluminescence Studies of Pure ZrO 2 and ZrO 2 : Eu +3 Nanophosphors Synthesised by Mic
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Structural, Morphological and Photoluminescence Studies of Pure ZrO2 and ZrO2: Eu+3 Nanophosphors Synthesised by Microwave-Assisted Hydrothermal Technique Manjunatha Shivanna 1 & Nanda Nagappa 2 & Dharmaprakash Mallenahally Siddalingappa 1 Received: 13 December 2019 / Accepted: 14 April 2020 # Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract The luminescence properties of pure and ZrO2: Eu+3 nanophosphors with different concentration of the Eu+3 is synthesised and studied. A novel and environment benign microwave-induced hydrothermal process is used to synthesise the nanoparticles. Asformed pure ZrO2 nanoparticles were X-ray amorphous, and upon calcination at higher temperatures, they crystallise to a combination of both cubic and tetragonal phases. However, the ZrO2: Eu+3 nanophosphors prepared through the same technique under similar conditions yield exclusively cubic ZrO2, and it entirely depends on the concentration of Eu+3 as revealed by XRD studies. The nanoparticles are found to be spherical, non-porous and agglomerated as observed by SEM. The surface area of the nanoparticles of pure ZrO2 is found to be 30 m2/g for as-formed samples and 130 m2/g for calcined samples by BET studies. The increase in the surface area for calcined sample is due to the escaping of the adsorbed hydroxyl groups from the surface of the nanoparticles. The photoluminescence properties of the pure and Eu+3-doped ZrO2 nanoparticles were measured under 251 nm excitation wavelength. Under this excitation, pure ZrO2 gives the emissions at 394 nm, whereas Eu+3-doped nanoparticles gives the emissions at 613 nm, which corresponds to inter-f-f transition from 5D0 ➔7F2 (613 nm) and is arising due to electronic dipole in the Eu+3 activator ion. CIE colour space (x, y) coordinates corresponding to 613 nm in the CIE chromaticity diagram is 0.680, 0.319. Keywords Amorphous ZrO2 . Crystallinity . Cubic phase . Surface area . Photoluminescence
Introduction Owing to unique optical and electronic characteristics arising from the electrons of 4f orbitals, the rare earth elements/ions Highlights • Environmental benevolent method for the preparation of pure and RE doped ZrO2 nanophosphors. • Quick and energy-saving method for the synthesis of nanoparticles metal oxides. • A single-step method for obtaining crystalline and amorphous materials. • The obtained nanoparticles exhibit red emission under VU irradiation and can be used in optical displays. * Nanda Nagappa [email protected] * Dharmaprakash Mallenahally Siddalingappa [email protected] 1
Department of Chemistry, BMS College of Engineering, Bull Temple road, Hanumanthnagar, Bengaluru 560019, India
2
Department of Chemistry, BMS College for Women, Bugle rock road, Basavanagudi, Bengaluru 560004, India
have gained sufficient attention of researchers for optical applications. When rare earth ions are introduced into a certain suitable host matrix, they behave as efficient luminescent materials with narrow band width and larger stokes shift. Different rar
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