Optimized photoluminescence properties of a novel red phosphor LiSrAlF6:Mn4+ synthesized at room-temperature
Optimized photoluminescence properties of a novel red phosphor LiSrAlF6:Mn4+ synthesized at room-temperature
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DOI：
10.1016/j.jallcom.2018.09.172
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发表时间：
2019-02
影响因子：
6.2
通讯作者：
Mengmeng Zhu;Yuexiao Pan;Mingmei Wu;Hongzhou Lian;Jun Lin
中科院分区：
文献类型：
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作者：
Mengmeng Zhu;Yuexiao Pan;Mingmei Wu;Hongzhou Lian;Jun Lin
为了补偿白色发光二极管（WLED）的红光分量，需要一种在蓝光区具有宽激发带和在红光区具有尖锐发射峰的红色荧光粉，该红色荧光粉通过黄色荧光粉Y3 Al 5 O 12：Ce 3+（YAG：Ce）转换蓝光。采用离子交换法在室温空气中合成了LiSrAlF 6：Mn 4+（LSAF：Mn）红色荧光粉，其形貌为球形，粒径约为50 μm。采用X射线粉末衍射（XRD）、扫描电子显微镜（SEM）和变温光致发光（PL）光谱对合成的荧光粉进行了表征。LSAF：Mn的激发光谱显示出400 ~ 500 nm的宽带激发，这是由于Mn ~（4+）的4A 2g → 4 T2 g的自旋允许跃迁，表明LSAF：Mn在固态照明方面具有潜在的应用前景。通过优化合成参数，获得了LSAF：Mn荧光粉的最佳发光强度。
A red phosphor with a broad excitation band in blue region and sharp emission peaks in red region is needed for compensating the red components of white light-emitting diodes (WLEDs) by converting blue light with a yellow phosphor Y3Al5O12:Ce3+(YAG:Ce). The red phosphor LiSrAlF6:Mn4+(LSAF:Mn) with morphology of flaky particles about 50 μm in diameter has been synthesized by an ion-exchange reaction route at room-temperature in air. The as-synthesized phosphors were characterized by x-ray powder diffraction (XRD), scanning electron microscope (SEM), and temperature-dependent photoluminescence (PL) spectra. The excitation spectrum of LSAF:Mn shows a broad-band excitation from 400 to 500 nm that is due to the spin-allowed transition of4A2g→4T2gof Mn4+, indicating a potential application for solid state lighting. The optimal PL intensity of the phosphor LSAF:Mn has been obtained by optimizing the synthetic parameters.