title: Characterisation and luminescence studies of Tm and Na doped magnesium borate phosphors.
abstract: In this study, structural and luminescence properties of magnesium borate of the form MgB4O7 doped with Tm and Na were investigated by X-ray diffraction (XRD), Raman spectroscopy and cathodoluminescence (CL). The morphologies of the synthetised compounds exhibit clustered granules and road-like materials. As doping trivalent ions into a host with divalent cations requires charge compensation, this effect is discussed. The CL spectra of undoped MgB4O7 shows a broad band emission centred around 350 nm which is postulated to be produced by self-trapped excitons and some other defects. From the CL emission spectrum, main emission bands centred at 360, 455, 475 nm due to the respective transitions of (1)D2→(3)H6,(1)D2→(3)F4 and (1)G4→(3)H6 suggest the presence of Tm(3+) ion in MgB4O7 lattice site. CL mechanism was proposed to explain the observed phenomena which are valuable in possibility of the developing new luminescent materials for different applications. In addition, the experimental Raman spectrum of doped and undoped MgB4O7 were reported and discussed.
authors.affiliation: Ege University, Institute of Nuclear Sciences, 35100 Bornova, Izmir, Turkey.
authors.forename: E
authors.initials: E
authors.lastname: Ekdal
authors.affiliation: Museo Nacional Ciencias Naturales, Jose Gutierrez Abascal 2, Madrid 28006, Spain.
authors.forename: J
authors.initials: J
authors.lastname: Garcia Guinea
authors.affiliation: Celal Bayar University, Faculty of Arts and Sciences, Department of Physics, Muradiye, Manisa, Turkey.
authors.forename: Y
authors.initials: Y
authors.lastname: Karabulut
authors.affiliation: Niğde University, Faculty of Arts and Sciences, Department of Physics, Niğde, Turkey.
authors.forename: A
authors.initials: A
authors.lastname: Canimoglu
authors.affiliation: Ege University, Vocational Training School, 35100 Bornova, Izmir, Turkey.
authors.forename: C
authors.initials: C
authors.lastname: Harmansah
authors.affiliation: Museo Nacional Ciencias Naturales, Jose Gutierrez Abascal 2, Madrid 28006, Spain.
authors.forename: A
authors.initials: A
authors.lastname: Jorge
authors.affiliation: Ege University, Institute of Nuclear Sciences, 35100 Bornova, Izmir, Turkey.
authors.forename: T
authors.initials: T
authors.lastname: Karali
authors.affiliation: Celal Bayar University, Faculty of Arts and Sciences, Department of Physics, Muradiye, Manisa, Turkey; Physics Department, Jazan University, P.O. Box 114, 45142 Jazan, Kingdom of Saudi Arabia. Electronic address: cannurdogan@yahoo.com.
authors.forename: N
authors.initials: N
authors.lastname: Can
keywords: Cathodoluminescence; MgB(4)O(7); Raman; Rare earth; XRD