Abstract This work is to synthesize a new whitlockite type polycrystal Sr9Y(PO4)7 by traditional solid state reaction and investigate its rare earth Eu2+ doped luminescent properties. Sr9Y(PO4)7 is designed according to a typical matrix Sr9Fe(PO4)7. It is an equivalent replacement by Y3+ at the same position of the Sr9Fe(PO4)7. The new type host Sr9Y(PO4)7 and its Eu2+ doped luminescent properties are studied in detail by TEM, SEM, XRD, Retiveld refinement and a variety of fluorescence test. Sr9Y(PO4)7 is a trigonal type crystal belonging to R-3 m (166). There are three kinds of Sr2+ sites in the crystal structure with different environments. Sr2+ has close spatial location and inferior occupancy ratio. After the structure and photo luminescence spectra analysis, Eu2+ can occupy three kinds Sr2+ in this host and emit bright green light peaking at ~523 nm with quantum efficiency 29.1% under NUV excitation. The loose or not tight structure leads to disappointed thermal stability, which the photo luminescence intensity just retains 30% compared with it at room temperature at 150 °C. White LED is fabricated successfully using Sr9Y(PO4)7: Eu2+ material and commercial blue BAM: Eu2+ and red CaAlSiN3: Eu2+ phosphors combining with a UV GaN chip. The chromaticity coordinates and CCT are (0.3372, 0.3418) and 5288 K.

中文翻译：

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新型白云石型结构材料Sr9Y(PO4)7及其在NUV光下Eu2+掺杂的绿光发射特性

摘要 本工作旨在通过传统固相反应合成一种新型白云石型多晶Sr9Y(PO4)7，并研究其稀土Eu2+掺杂发光特性。Sr9Y(PO4)7 根据典型的基体 Sr9Fe(PO4)7 设计。它在 Sr9Fe(PO4)7 的相同位置被 Y3+ 等效替代。通过TEM、SEM、XRD、Retiveld精修和多种荧光测试，对新型主体Sr9Y(PO4)7及其Eu2+掺杂发光性能进行了详细研究。Sr9Y(PO4)7 是属于 R-3 m (166) 的三角型晶体。晶体结构中存在三种不同环境的Sr2+位点。Sr2+空间位置近，占有率较差。经过结构和光致发光光谱分析，Eu2+ 可以在该主体中占据三种 Sr2+ 并在 NUV 激发下发出峰值为 ~523 nm 的亮绿色光，量子效率为 29.1%。松散或不紧密的结构导致令人失望的热稳定性，与室温 150°C 相比，光致发光强度仅保留 30%。使用 Sr9Y(PO4)7: Eu2+ 材料和商用蓝色 BAM: Eu2+ 和红色 CaAlSiN3: Eu2+ 荧光粉与 UV GaN 芯片成功制造白光 LED。色度坐标和 CCT 为 (0.3372, 0.3418) 和 5288 K。Eu2+ 材料和商用蓝色 BAM：Eu2+ 和红色 CaAlSiN3：Eu2+ 荧光粉与 UV GaN 芯片相结合。色度坐标和 CCT 为 (0.3372, 0.3418) 和 5288 K。Eu2+ 材料和商用蓝色 BAM：Eu2+ 和红色 CaAlSiN3：Eu2+ 荧光粉与 UV GaN 芯片相结合。色度坐标和 CCT 为 (0.3372, 0.3418) 和 5288 K。