Park K, Kim D H, Pi J W, Gwon S Y, Jeon E C, Kim J S
Faculty of Nanotechnology and Advanced Materials Engineering, Sejong University, Seoul, Republic of Korea.
Department of Climate and Energy, Sejong University, Seoul, Republic of Korea.
Luminescence. 2025 Jan;40(1):e70083. doi: 10.1002/bio.70083.
The influence of Eu concentration on the crystal structure and photoluminescence (PL) properties of Ca(PO):xEu (0.06 ≤ x ≤ 0.10) phosphors is systematically investigated using X-ray diffraction (XRD) Rietveld refinement, scanning electron microscopy (SEM), Fourier transform infrared (FT-IR) spectroscopy, UV-visible spectroscopy, and PL spectroscopy. The prepared phosphors exhibit a single rhombohedral phase with the space group R3c. The constituent ions occupy various crystallographic sites, including Ca(1-5), Eu(1-3), P(1-3), and O(1-10) sites. Under 397-nm excitation, the emission spectra show distinct emission peaks between 525 and 725 nm, corresponding to the D → F (j = 1 and 2) and D → F (j = 1, 2, 3, and 4) transitions of Eu ions. The concentration quenching observed in the phosphors is attributed to electric multipolar interactions. Among the prepared phosphors, Ca(PO):0.08Eu phosphor shows the highest emission efficiency and excellent color performance. These results demonstrate that Ca(PO):xEu phosphors have significant potential as red-emitting materials for white light-emitting diode (WLED) applications.
采用X射线衍射（XRD）全谱拟合、扫描电子显微镜（SEM）、傅里叶变换红外（FT-IR）光谱、紫外可见光谱和光致发光（PL）光谱等方法，系统研究了Eu浓度对Ca(PO):xEu（0.06≤x≤0.10）荧光粉晶体结构和光致发光性能的影响。制备的荧光粉呈现出具有R3c空间群的单一菱面体相。组成离子占据各种晶体学位置，包括Ca(1 - 5)、Eu(1 - 3)、P(1 - 3)和O(1 - 10)位置。在397 nm激发下，发射光谱在525至725 nm之间显示出明显的发射峰，对应于Eu离子的D→F（j = 1和2）以及D→F（j = 1、2、3和4）跃迁。荧光粉中观察到的浓度猝灭归因于电多极相互作用。在所制备的荧光粉中，Ca(PO):0.08Eu荧光粉表现出最高的发射效率和优异的颜色性能。这些结果表明，Ca(PO):xEu荧光粉作为白光发光二极管（WLED）应用的红色发光材料具有巨大潜力。
