Abstract
Ce3+/Bi3+ codoped Sr2SiO4:Dy3+ phosphors were prepared by the solid-state reaction method using NH4Cl as the flux. Their phase compositions, photoluminescence properties and the energy transfer processes were systematically investigated. The composition-induced phase transition of (Sr0.99−xRx)2SiO4:Dy3+ (R=Ce3+/Bi3+) powders was dependent on the radius of doped ions and their concentrations. The doping of smaller ions was beneficial to the formation of α′-Sr2SiO4. The luminescence intensity of Dy3+ was enhanced 2 or 3 times by the sensitization of Bi3+/Ce3+ through the electric multipoles interaction. The bright white light was observed from the Sr2SiO4:Dy,Bi phosphors with stable CIE chromaticity coordinates. This phosphor has great potential to act as a single-matrix phosphor for white light emitting diodes.
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