Effect of Dy3+ or Eu2+ co-activator on a BaCa (SO4)2:Ce3+ mixed alkaline earth sulfate phosphor

The individual emission and energy transfer between Ce3+ and Eu2+ or Dy3+ 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 Eu2+ or Dy3+ dopants is greater than when they are co-doped with Ce3+. An efficient Ce3+ -> Eu2+ [T-2(2g)(4f(6)5d) -> S-8(7/2)(4f(7))] and Ce3+ -> Dy3+ (F-4(9/2) -> H-6(15/2) and F-4(9/2) -> H-6(13/2)) energy transfer takes place in the BaCa(SO4)(2) host. A strong blue emission peak was observed at 462nm for Eu2+ ions and an orange emission peak at 574 nmfor Dy3+ ions. Hence, this phosphor may be used as a lamp phosphor. Copyright (C) 2015 JohnWiley & Sons, Ltd.