title: Effect of Dy(3+) or Eu(2+) co-activator on a BaCa(SO4)2:Ce(3+) mixed alkaline earth sulfate phosphor.
abstract: The individual emission and energy transfer between Ce(3+) and Eu(2+) or Dy(3+) in BaCa(SO4)2 mixed alkaline earth sulfate phosphor prepared using a co-precipitation method is described. The phosphor was characterized by X-ray diffraction (XRD) and photoluminescence (PL) studies and doped by Ce;Eu and Dy rare earths. All phosphors showed excellent blue-orange emission on excitation with UV light. PL measurements reveal that the emission intensity of Eu(2+) or Dy(3+) dopants is greater than when they are co-doped with Ce(3+). An efficient Ce(3+) → Eu(2+) [(2) T2g(4f(6)5d) → (8)S7/2(4f7)] and Ce(3+) → Dy(3+) ((4)F9/2 → (6)H15/2 and (4)F9/2 → (6)H13/2) energy transfer takes place in the BaCa(SO4)2 host. A strong blue emission peak was observed at 462 nm for Eu(2+) ions and an orange emission peak at 574 nm for Dy(3+) ions. Hence, this phosphor may be used as a lamp phosphor.
authors.affiliation: Sardar Patel College, Chandrapur, India.
authors.forename: V C
authors.initials: VC
authors.lastname: Kongre
authors.affiliation: K. Z. S. Science College, Kalmeshwar, Nagpur, 441501, India.
authors.forename: S C
authors.initials: SC
authors.lastname: Gedam
authors.affiliation: Department of Physics, R.T.M. Nagpur University, Nagpur, 440033, India.
authors.forename: S J
authors.initials: SJ
authors.lastname: Dhoble
mesh_terms: D004419:Dysprosium / Q000737:chemistry*; D004735:Energy Transfer; D005063:Europium / Q000737:chemistry*; D049449:Luminescence; D049408:Luminescent Agents / Q000737:chemistry*; D008163:Luminescent Measurements; D008673:Metals, Alkaline Earth / Q000737:chemistry; D013431:Sulfates / Q000737:chemistry*
chemical_list: D049408:Luminescent Agents; D008673:Metals, Alkaline Earth; D013431:Sulfates; D004419:Dysprosium; D005063:Europium
keywords: alkaline earth sulfate; energy transfer; lamp phosphor; optical material; photoluminescence