Abstract Spectrally tunable phosphors have been extensively studied for their potential applications in phosphor-converted white light-emitting diodes and display devices. Herein, we synthesize a series of color-tunable (Sr2.95-xCax)Ce(PO4)3:0.05Eu2+ (x = 0-2.95) phosphors via solid-state reaction, which are designed by using eulytite-type phosphate with different PO4 structural ordering, viz., Sr3Ce(PO4)3:Eu2+ with disordered state of PO4 tetrahedrons, and Ca3Ce(PO4)3:Eu2+ with ordered state of PO4 tetrahedrons. In Sr3Ce(PO4)3:Eu2+, the successive substitution of Sr by Ca causes microstructural transformation of PO4 tetrahedrons from disordered state to ordered state. Strikingly, the disorder-to-ordered microstructural variation of PO4 anion-groups remotely controls Eu2+ emissions, yielding adjustable emission from yellow-green to yellow and then green emission and fine tailoring of photoluminescence excitation spectra, which are demonstrated by an in-depth local structure analysis of X-ray, nuclear magnetic resonance and electron paramagnetic resonance. This work provides a deeper understanding on how structural ordering degree affects the local structures of Eu2+ centers.

中文翻译：

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通过调节 (Sr3-xCax)Ce(PO4)3:Eu2+ 磷光体中 PO4 阴离子基团的结构排序来远程控制 Eu2+ 排放

摘要 光谱可调荧光粉因其在荧光粉转换白光发光二极管和显示设备中的潜在应用而被广泛研究。在此，我们通过固态反应合成了一系列颜色可调的 (Sr2.95-xCax)Ce(PO4)3:0.05Eu2+ (x = 0-2.95) 荧光粉，这些荧光粉是通过使用具有不同PO4 结构有序，即 Sr3Ce(PO4)3:Eu2+ 具有无序状态的 PO4 四面体，以及 Ca3Ce(PO4)3:Eu2+ 具有有序状态的 PO4 四面体。在 Sr3Ce(PO4)3:Eu2+ 中，Sr 被 Ca 的连续取代导致 PO4 四面体从无序状态到有序状态的微观结构转变。引人注目的是，PO4 阴离子基团从无序到有序的微观结构变化远程控制了 Eu2+ 的排放，产生从黄绿色到黄色然后绿色发射的可调发射和光致发光激发光谱的精细定制，这通过对 X 射线、核磁共振和电子顺磁共振的深入局部结构分析得到证明。这项工作对结构有序度如何影响 Eu2+ 中心的局部结构提供了更深入的理解。