Department of Physics, University of Johannesburg, Johannesburg, South Africa.
Department of Physics, University of the Free State, Bloemfontein, South Africa.
Luminescence. 2024 Sep;39(9):e4905. doi: 10.1002/bio.4905.
To investigate the impact of PO anionic groups, the trivalent europium ion-doped calcium molybdate (CaMoO-PO:xEu, where x = 0.5, 1.0, 1.5, 2.0, and 2.5 mol%) phosphors were synthesized using the solid-state reaction method. The detailed study of the phosphor materials was carried out by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), optical diffuse reflectance spectroscopy (DRS), and photoluminescence (PL) spectroscopy. The XRD results indicate that the substitution of PO anion and Eu dopant ion did not affect the crystal structures of the CaMoO phosphors. Ultraviolet-visible (UV-vis) absorption analysis revealed the change of absorption edge of both un-doped and Eu-doped CaMoO-PO phosphors. Under the 394 nm UV-excitation, the recorded PL spectra showed an intense peak at 615 nm corresponding to the Eu: D → F transition. The results of the Commission Internationale de l'Eclairage (CIE) diagram reported that the color of the emissions lies in the red color zone and there is no change in the CIE coordinates of the overall emission for Eu-doped CaMoO-PO as Eu concentration changes. Thus, these observations led to finding the best red components for white light-emitting diode applications.
为了研究 PO 阴离子基团的影响，采用固态反应法合成了三价铕离子掺杂的钼酸钙（CaMoO-PO：xEu，其中 x=0.5、1.0、1.5、2.0 和 2.5 mol%）荧光粉。通过 X 射线衍射（XRD）、场发射扫描电子显微镜（FE-SEM）、傅里叶变换红外光谱（FT-IR）、X 射线光电子能谱（XPS）、漫反射光谱（DRS）和光致发光（PL）光谱对荧光粉材料进行了详细研究。XRD 结果表明，PO 阴离子和 Eu 掺杂离子的取代并没有影响 CaMoO 荧光粉的晶体结构。紫外-可见（UV-vis）吸收分析表明，未掺杂和 Eu 掺杂的 CaMoO-PO 荧光粉的吸收边都发生了变化。在 394nm 的紫外激发下，记录到的 PL 光谱在 615nm 处显示出一个强峰，对应于 Eu：D→F 跃迁。国际照明委员会（CIE）图的结果表明，发射的颜色位于红色区域，并且随着 Eu 浓度的变化，Eu 掺杂 CaMoO-PO 的整体发射的 CIE 坐标没有变化。因此，这些观察结果为寻找用于白光发光二极管的最佳红色组件提供了依据。
