title: CaTiO3:Eu3+ red nanophosphor: low temperature synthesis and photoluminescence properties.
abstract: Nanoparticles of Eu3+ doped (1-9 mol%) CaTiO3 were prepared using low temperature (500°C) solution combustion technique using metal nitrates as precursors and urea as fuel. The powder X-ray diffraction patterns of the as-formed products show single orthorhombic phase. The crystallite size was estimated using Scherrer's method and found to be in the range 40-45 nm. The effect of Eu3+ ions on luminescence characteristics of CaTiO3 was studied and the results were discussed in detail. The phosphors exhibit bright red emission upon 398 nm excitation. The characteristic emission peaks recorded at ∼540, 593, 615, 653, 696 and 706 nm (5D0→7Fj=0,1,2,3,4,5) were attributed to Eu3+ ions. The electronic transition corresponding to 5D0→7F2 (615 nm) was stronger than the magnetic dipole transition 5D0→7F1 of Eu3+ ions (596 nm). The CIE chromaticity co-ordinates were calculated from emission spectra, the values (x,y) very close to NTSC standard value of red emission. Therefore, the present phosphors were highly useful for display applications.
authors.affiliation: Jawaharlal Nehru Technological University, Anantapur 515 002, India; Department of Physics, VV Puram College of Science, Bangalore 560 004, India.
authors.forename: M
authors.initials: M
authors.lastname: Shivram
authors.affiliation: Department of Physics, East West Institute of Technology, Bangalore 560 091, India. Electronic address: scphysics@gmail.com.
authors.forename: S C
authors.initials: SC
authors.lastname: Prashantha
authors.affiliation: Centre for Nano Research (CNR), Tumkur University, Tumkur 572 103, India. Electronic address: bhushanvlc@gmail.com.
authors.forename: H
authors.initials: H
authors.lastname: Nagabhushana
authors.affiliation: B.S.Narayan center of excellance for advanced materials, Department of Mechanical Engineering, B.M.S. Institute of Technology, Yelahanka, Bangalore 560 064, India.
authors.forename: S C
authors.initials: SC
authors.lastname: Sharma
authors.affiliation: Department of Physics, JNTUA College of Engineering, Pulivendula 516 390, India.
authors.forename: K
authors.initials: K
authors.lastname: Thyagarajan
authors.affiliation: Department of Chemistry, M.S. Ramaiah Institute of Technology, Bangalore 560 054, India.
authors.forename: R
authors.initials: R
authors.lastname: Harikrishna
authors.affiliation: Department of Chemistry, M.S. Ramaiah Institute of Technology, Bangalore 560 054, India.
authors.forename: B M
authors.initials: BM
authors.lastname: Nagabhushana
mesh_terms: D017610:Calcium Compounds / Q000737:chemistry*; D005063:Europium / Q000737:chemistry*; D049449:Luminescence; D049408:Luminescent Agents / Q000737:chemistry*; D008163:Luminescent Measurements; D010087:Oxides / Q000737:chemistry*; D014025:Titanium / Q000737:chemistry*
chemical_list: D017610:Calcium Compounds; D049408:Luminescent Agents; D010087:Oxides; C059910:perovskite; D005063:Europium; D014025:Titanium
keywords: CaTiO(3):Eu(3+); Combustion technique; HRTEM; Phosphor; Photoluminescence; TEM