Tailoring the photoluminescence properties of lanthanum strontium aluminate phosphors by controlling crystal field environment with fluorine ions

Add time:08/08/2019    Source:sciencedirect.com

A series of novel lanthanum strontium aluminate phosphors, Ce3+-doped LaSr2AlO(5–0.5x)Fx(LSAF) phosphors were successfully synthesized using the high-temperature solid state synthesis procedure under reducing atmosphere (H2/N2=1/4). The X-ray diffraction 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 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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