摘要
A series of novel lanthanum strontium aluminate phosphors, Ce3＋-doped LaSr2AlO（5–0.5x）Fx（LSAF） phosphors were success-fully synthesized using the high-temperature solid state synthesis procedure under reducing atmosphere （H2/N2=1/4）. The X-ray diffrac-tion pattern revealed that LSAF sample was a pure LaSr2AlO5 phase with a sintering temperature of 1250 °C. With the increasing amount of SrF2, the particle size of powders increased and the shape of particles changed more regularly. Being an orange/red emitting phosphors for orange and white light emitting diodes, LSAF：Ce3＋ could be effectively excited by blue lights with typical 4f→5d transitions of Ce3＋ ions. PL and PLE spectra showed inhomogeneous enlargement effects with the increase of F/O ratios, which suggested that electronega-tivity effect was promoted when F/O ratio increased. This was further confirmed by a red shift of PL spectra peak when F/O was in-creased. It can be concluded that the LSAF：Ce phosphors have the potential to meet the development of white light-emitting diodes.
A series of novel lanthanum strontium aluminate phosphors, Ce3＋-doped LaSr2AlO（5–0.5x）Fx（LSAF） phosphors were success-fully synthesized using the high-temperature solid state synthesis procedure under reducing atmosphere （H2/N2=1/4）. The X-ray diffrac-tion pattern revealed that LSAF sample was a pure LaSr2AlO5 phase with a sintering temperature of 1250 °C. With the increasing amount of SrF2, the particle size of powders increased and the shape of particles changed more regularly. Being an orange/red emitting phosphors for orange and white light emitting diodes, LSAF：Ce3＋ could be effectively excited by blue lights with typical 4f→5d transitions of Ce3＋ ions. PL and PLE spectra showed inhomogeneous enlargement effects with the increase of F/O ratios, which suggested that electronega-tivity effect was promoted when F/O ratio increased. This was further confirmed by a red shift of PL spectra peak when F/O was in-creased. It can be concluded that the LSAF：Ce phosphors have the potential to meet the development of white light-emitting diodes.
基金
supported by Jiangsu Innovation Program for Graduate Education(CXZZ12_0147)
A Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions
