Abstract A series of Sr8.5-mMg2+m(PO4)7:Eu2+,Mn2+ (m = 0 and ±0.5) phosphors were prepared by solid-state reaction. The phase purity, luminescence properties and thermal stability were investigated systematically. Under 365 nm excitation, the Sr8.5-mMg2+m(PO4)7:Eu2+ exhibits a wide emission band covering from 425 to 850 nm with three main peaks centered at 412, 515 and 625 nm, which are attributed to the 4f65d1→4f7 transitions of Eu2+ in different crystallographic sites. The emission color can be tuned by changing the concentrations of Mg2+, Eu2+ and Mn2+. To obtain white-emitting light, the Eu2+-Mn2+ co-doped samples were designed, in which an energy transfer from Eu2+ to Mn2+ was found. On the other hand, the fluorescence intensity ratio (FIR) technique was utilized in the Eu2+-single-doped sample for optical temperature-sensing. The high absolute and relative sensitivities were achieved. The above investigations indicate that the developed phosphors could show multi-functional applications in white LEDs and optical thermometers.

中文翻译：

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用于多功能应用的发射可调 Sr8.5-mMg2+m(PO4)7:Eu2+/Mn2+ 荧光粉

摘要 通过固相反应制备了一系列Sr8.5-mMg2+m(PO4)7:Eu2+,Mn2+ (m = 0 and ±0.5)荧光粉。系统地研究了相纯度、发光特性和热稳定性。在 365 nm 激发下，Sr8.5-mMg2+m(PO4)7:Eu2+ 具有覆盖 425 到 850 nm 的宽发射带，三个主峰集中在 412、515 和 625 nm，这归因于 4f65d1→ Eu2+ 在不同晶位的 4f7 跃迁。可以通过改变 Mg2+、Eu2+ 和 Mn2+ 的浓度来调整发射颜色。为了获得白光，设计了 Eu2+-Mn2+ 共掺杂样品，其中发现了从 Eu2+ 到 Mn2+ 的能量转移。另一方面，在 Eu2+ 单掺杂样品中利用荧光强度比 (FIR) 技术进行光学温度传感。实现了高绝对和相对灵敏度。上述研究表明，开发的荧光粉可以在白光 LED 和光学温度计中显示出多功能应用。