title: Dy3+ and Mn2+ emission in fluoride- and chloride-based Na3 (SO4)X (X = F or Cl) phosphors.
abstract: In the present study, Na3 (SO4)X (X = F or Cl) halosulphate phosphors have been synthesized by the solid-state diffusion method. The phase formation of the compounds Na3 (SO4)F and Na3 (SO4)Cl were confirmed by X-ray powder diffraction (XRD) measurement. Photoluminescence (PL) excitation spectrum measurement of Na3 (SO4)F:Ce3+ and Na3 (SO4)Cl:Ce3+ shows this phosphor can be efficiently excited by near-ultraviolet (UV) light and presents a dominant luminescence band centred at 341 nm for Ce3+, which is responsible for energy transfer to Dy3+ and Mn2+ ions. The efficient Ce3+  → Dy3+ energy transfer in Na3 (SO4)F and Na3 (SO4)Cl under UV wavelength was observed due to 4 F(9/2) to 6H(15/2) and 6H(13/2) level, while Ce3+ → Mn2+ was observed due to (4)  T1 state to (6) A1 . The purpose of the present study is to develop and understanding the photoluminescence properties of Ce3+ -, Dy3+ - and Mn2+ -doped fluoride and chloride Na3 (SO4)X (X = F or Cl) luminescent material, which can be the efficient phosphors in many applications, such as scintillation applications, TL dosimetry and the lamp industry, etc.
authors.affiliation: K. Z. S. Science College, Kalmeshwar, Nagpur, 441501, India. gedam_sc@rediffmail.com
authors.forename: S C
authors.initials: SC
authors.lastname: Gedam
authors.forename: S J
authors.initials: SJ
authors.lastname: Dhoble
authors.forename: S V
authors.initials: SV
authors.lastname: Moharil
mesh_terms: D002712:Chlorides / Q000737:chemistry*; D004735:Energy Transfer; D005456:Fluorescent Dyes / Q000138:chemical synthesis / Q000737:chemistry*; D005459:Fluorides / Q000737:chemistry*; D008345:Manganese / Q000737:chemistry*
chemical_list: D002712:Chlorides; D005456:Fluorescent Dyes; D008345:Manganese; D005459:Fluorides