Solid state synthesis, energy transfer and tunable luminescence of Ce3+/Mn2+ codoped Ba9Lu2Si6O24 phosphors

A series of Ce3+ and/or Mn2+ doped Ba9Lu2Si6O24 phosphors were prepared by the solid state reaction. The phase and luminescent properties of the synthesized phosphors were investigated. The single phase of the synthesized phosphors indicates that Ce3+/Mn2+ ions doped into Ba9Lu2Si6O24 hosts entirely and formed solid state compounds. Mn2+ ions substitute Lu3+ sites in Ba9Lu2Si6O24 24 but Ce3+ ions substitute both Lu3+ and Ba2+ sites in Ba9Lu2Si6O24. The emission bands of Ba9Lu2Si6O24:Ce3+ phosphors show dependence on excitation wavelength and Ce3+ concentration. Upon the excitation at 400 and 350 nm, Ba9Lu2Si6O24:Ce3+ phosphors show emission bands peaking at 495 and 422 nm, respectively. Upon the excitation at 350 nm, Ba9Lu2Si6O24:Ce3+/Mn2+ phosphors show emission bands corresponding to Ce3+ and Mn2+ ions. Due to energy transfer from Ce3+ to Mn2+ , tunable luminescence is obtained in Ba9Lu2Si6O24:Ce3+/Mn2+ phosphors.