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

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• 作者：Xiguang GU (顾席光) ; Renli FU (傅仁利) ; ^{renlifu@nuaa.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Fang YANG (杨 芳) ; Ye TANG (汤 晔) ; Jun FANG (方 军)
• 关键词：photoluminescence ; LSAF ; Ce3+ ; phosphors ; lanthanum strontium aluminate ; rare earths
• 刊名：Journal of Rare Earths
• 出版年：2016
• 出版时间：November 2016
• 年：2016
• 卷：34
• 期：11
• 页码：1089-1094
• 全文大小：2207 K

文摘

A series of novel lanthanum strontium aluminate phosphors, Ce³⁺-doped LaSr₂AlO_(5–0.5x)F_x(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.