title: Bio-mediated route for the synthesis of shape tunable Y₂O₃: Tb³⁺ nanoparticles: Photoluminescence and antibacterial properties.
abstract: The study reports green mediated combustion route for the synthesis of Tb(3+) ion activated Y2O3 nanophosphors using Aloe Vera gel as fuel. The concentration of Tb(3+) plays a key role in controlling the morphology of Y2O3 nanostructures. The formation of different morphologies of Y2O3: Tb(3+) nanophosphors were characterized by PXRD, SEM, TEM and HRTEM. PXRD data and Rietveld analysis evident the formation of single phase Y2O3 with cubic crystal structure. The influence of Tb(3+) ion concentration on structural morphology, UV-visible absorption and PL emission were investigated systematically. The PL emission of Y2O3: Tb(3+) (1-11 mol%) nanophosphors were studied in detail under 271 and 304nm excitation wavelengths. The CIE coordinates lies well within green region and correlated color temperature values were found to be 6221 and 5562K under different excitations. Thus, the present phosphor can serve as an excellent candidate for LEDs. Further, prismatic Y2O3: Tb(3+) (3 mol%) nanophosphor showed significant antibacterial activity against Pseudomonas desmolyticum and Staphylococcus aureus. The present study successfully demonstrates Y2O3: Tb(3+) nanophosphors can be used for display applications as well as in medical applications for controlling pathogenic bacteria.
authors.affiliation: Department of Physics, GFGC Tumkur, Tumkur 572 102, Karnataka, India; Department of Physics, Sathyabama University, Jeppiaar Nagar, Chennai 600 119, Tamilnadu, India.
authors.forename: J B
authors.initials: JB
authors.lastname: Prasannakumar
authors.affiliation: Department of Physics, Lal Bahadur Shastry Government First Grade College, Bangalore 560 032, India. Electronic address: vidyays.phy@gmail.com.
authors.forename: Y S
authors.initials: YS
authors.lastname: Vidya
authors.affiliation: Research Center, Department of Science, East West Institute of Technology, Bangalore 560 091, India.
authors.forename: K S
authors.initials: KS
authors.lastname: Anantharaju
authors.affiliation: Department of Physics, Maharani's Science College, Palace Road, Bangalore 560 001, Karnataka, India.
authors.forename: G
authors.initials: G
authors.lastname: Ramgopal
authors.affiliation: CNR Rao Centre for Advanced Materials, Tumkur University, Tumkur 572103, India. Electronic address: bhushanvlc@gmail.com.
authors.forename: H
authors.initials: H
authors.lastname: Nagabhushana
authors.affiliation: Dayananda Sagar University, Shavige Malleshwara Hills, Kumaraswamy Layout, Bangalore 560078, Karnataka, India.
authors.forename: S C
authors.initials: SC
authors.lastname: Sharma
authors.affiliation: Department of Physics, B M S Institute of Technology, Yelahanka, Bangalore 560064, India.
authors.forename: B
authors.initials: B
authors.lastname: Daruka Prasad
authors.affiliation: Research Center, Department of Science, East West Institute of Technology, Bangalore 560 091, India.
authors.forename: S C
authors.initials: SC
authors.lastname: Prashantha
authors.affiliation: CNR Rao Centre for Advanced Materials, Tumkur University, Tumkur 572103, India.
authors.forename: R B
authors.initials: RB
authors.lastname: Basavaraj
authors.affiliation: Department of Studies and Research in Environmental Science, Tumkur University, Tumkur 572 103, India.
authors.forename: H
authors.initials: H
authors.lastname: Rajanaik
authors.affiliation: Department of Studies and Research in Environmental Science, Tumkur University, Tumkur 572 103, India.
authors.forename: K
authors.initials: K
authors.lastname: Lingaraju
authors.affiliation: Department of Mechanical Engineering, R.V. College of Engineering, Bangalore 560059, India.
authors.forename: K R
authors.initials: KR
authors.lastname: Prabhakara
authors.affiliation: Research Center, Department of Science, East West Institute of Technology, Bangalore 560 091, India.
authors.forename: H P
authors.initials: HP
authors.lastname: Nagaswarupa
mesh_terms: D000900:Anti-Bacterial Agents / Q000737:chemistry / Q000494:pharmacology*; D001419:Bacteria / Q000187:drug effects*; D032701:Biomimetics; D003460:Crystallization; D049449:Luminescence; D049408:Luminescent Agents / Q000737:chemistry / Q000494:pharmacology*; D046529:Microscopy, Electron, Transmission; D053758:Nanoparticles / Q000737:chemistry*; D013696:Temperature; D013725:Terbium / Q000737:chemistry*; D014961:X-Ray Diffraction; D015019:Yttrium / Q000737:chemistry*
chemical_list: D000900:Anti-Bacterial Agents; D049408:Luminescent Agents; D013725:Terbium; D015019:Yttrium; C091417:yttria
keywords: Aloe Vera gel; Antibacterial activity; Morphology; Photoluminescence; Y(2)O(3): Tb(3+) nanophosphors