title: Photoluminescence studies on rare earth titanates prepared by self-propagating high temperature synthesis method.
abstract: The laser-induced luminescence studies of the rare earth titanates (R2Ti2O7) (R=La, Nd and Gd) using 355 nm radiation from an Nd:YAG laser are presented. These samples with submicron or nanometer size are prepared by the self-propagating high temperature synthesis (SHS) method and there is no known fluorescence shown by these rare earths in the visible region. Hence, the luminescence transitions shown by the La2Ti2O7 near 610 nm and Gd2Ti2O7 near 767 nm are quite interesting. Though La3+ ions with no 4f electrons have no electronic energy levels that can induce excitation and luminescence processes in the visible region, the presence of the Ti3+ ions leads to luminescence in this region.
authors.affiliation: International School of Photonics, Cochin University of Science and Technology, Kalamssery, Kochi 682022, Kerala, India. lyjokjoseph@yahoo.co.in
authors.forename: Lyjo K
authors.initials: LK
authors.lastname: Joseph
authors.forename: K R
authors.initials: KR
authors.lastname: Dayas
authors.forename: Soniya
authors.initials: S
authors.lastname: Damodar
authors.forename: Bindu
authors.initials: B
authors.lastname: Krishnan
authors.forename: K
authors.initials: K
authors.lastname: Krishnankutty
authors.forename: V P N
authors.initials: VP
authors.lastname: Nampoori
authors.forename: P
authors.initials: P
authors.lastname: Radhakrishnan
mesh_terms: D003460:Crystallization; D004563:Electrochemistry; D005682:Gadolinium / Q000737:chemistry; D007477:Ions; D007811:Lanthanum / Q000737:chemistry*; D008027:Light; D049449:Luminescence; D008674:Metals, Rare Earth / Q000032:analysis* / Q000737:chemistry; D008855:Microscopy, Electron, Scanning; D009584:Nitrogen / Q000737:chemistry; D010087:Oxides / Q000737:chemistry; D010100:Oxygen / Q000737:chemistry*; D013696:Temperature; D014025:Titanium / Q000737:chemistry*; D014961:X-Ray Diffraction
chemical_list: D007477:Ions; D008674:Metals, Rare Earth; D010087:Oxides; D007811:Lanthanum; D005682:Gadolinium; D014025:Titanium; D009584:Nitrogen; D010100:Oxygen