Luminescence enhancement of Eu 2+, Ce 3+ co-doped Ba 3Si 5O 13−δN δ phosphors

Abstract

Host lattice Ba 3Si 5O 13−δN δ oxonitridosilicates have been synthesized by the traditional solid state reaction method. The lattice structure is based on layers of vertex-linked SiO 4 tetrahedrons and Ba 2+ ions, where each Ba 2+ ion is coordinated by eight oxygen atoms forming distorted square antiprisms. Under an excitation wavelength of 365 nm, Ba 3Si 5O 13−δN δ:Eu 2+ and Ba 3Si 5O 13−δN δ:Eu 2+,Ce 3+ show broad emission bands from about 400–620 nm, with maxima at about 480 nm and half-peak width of around 130 nm. The emission intensity is strongly enhanced by co-doping Ce 3+ ions into the Ba 3Si 5O 13−δN δ:Eu 2+ phosphor, which could be explained by energy transfer. The excitation band from the near UV to the blue light region confirms the possibility that Ba 3Si 5O 13−δN δ:Eu 2+, Ce 3+ could be used as a phosphor for white LEDs.