Tailoring the photoluminescence properties of lanthanum strontium aluminate phosphors by controlling crystal field environment with fluorine ions
来源期刊：Journal of Rare Earths2016年第11期
论文作者：顾席光 傅仁利 杨芳 汤晔 方军
文章页码：1089 - 1094
摘 要：A series of novel lanthanum strontium aluminate phosphors,Ce3+-doped LaSr2AlO5-0.5xFx（LSAF） phosphors were successfully synthesized using the high-temperature solid state synthesis procedure under reducing atmosphere（H2/N2=l/4）.The X-ray diffraction pattern revealed that LSAF sample was a pure LaSr2AlO5 phase with a sintering temperature of 1250 ℃.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 electronegativity effect was promoted when F/O ratio increased.This was further confirmed by a red shift of PL spectra peak when F/O was increased.It can be concluded that the LSAF:Ce phosphors have the potential to meet the development of white light-emitting diodes.
顾席光，傅仁利，杨芳，汤晔，方军
College of Materials Science and Technology,Nanjing University of Aeronautics and Astronautics
摘 要：A series of novel lanthanum strontium aluminate phosphors,Ce3+-doped LaSr2AlO5-0.5xFx（LSAF） phosphors were successfully synthesized using the high-temperature solid state synthesis procedure under reducing atmosphere（H2/N2=l/4）.The X-ray diffraction pattern revealed that LSAF sample was a pure LaSr2AlO5 phase with a sintering temperature of 1250 ℃.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 electronegativity effect was promoted when F/O ratio increased.This was further confirmed by a red shift of PL spectra peak when F/O was increased.It can be concluded that the LSAF:Ce phosphors have the potential to meet the development of white light-emitting diodes.
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