The development of highly stable and efficient oxide-based red phosphors is urgently required for next-generation lighting devices. Herein, we report the micro/crystal structures and luminescent properties of single-phase Eu₂(WO₄)₃ and Eu³⁺-doped WO₃-Eu₂(WO₄)₃ composite phosphors prepared by a one-step conventional solid-state reaction method in air atmosphere. As increasing Eu contents in the mixtures of WO₃ and Eu₂O₃, the intensities of the X-ray diffraction peaks of Eu₂(WO₄)₃ increased while that of WO₃ decreased. The photoluminescence intensity of the synthesized phosphors increased with increase in the Eu content when calcined at 900 °C, while it degraded at a higher temperature. Red-emitting single-phase Eu₂(WO₄)₃ powders were successfully obtained when the WO₃ and Eu₂O₃ powders were calcined in the ratio of 3:1. The intensity of the red emission spectra of the Eu₂(WO₄)₃ phosphor was higher than those of the 6, 12, and 24 at.% Eu-added WO₃ composites at excitation wavelengths of 394 and 465 nm. On the other hand, the intensity of emission from the single-phase phosphor was lower than that of the Eu-doped WO₃-Eu₂(WO₄)₃ composites under excitation of UV light at 254 nm. Thus, we propose two prospective phosphors for application as red phosphors at various wavelengths.

下一代照明设备迫切需要开发高度稳定和高效的氧化物基红色荧光粉。在此，我们报告了单相 Eu ₂ (WO ₄ ) ₃和 Eu ³⁺掺杂的 WO ₃ -Eu ₂ (WO ₄ ) ₃复合荧光粉的微/晶体结构和发光性能，该复合荧光粉通过一步常规固体-空气气氛中的状态反应法。随着WO ₃和Eu ₂ O ₃混合物中Eu含量的增加，Eu ₂ (WO ₄ ) ₃的X射线衍射峰强度增加WO ₃下降。合成的荧光粉在 900 °C 下煅烧时，其光致发光强度随着 Eu 含量的增加而增加，而在较高温度下则降解。将WO ₃和Eu ₂ O ₃粉体按3:1的比例煅烧，成功获得了发红光的单相Eu ₂ (WO ₄ ) ₃粉体。Eu ₂ (WO ₄ ) ₃荧光粉的红色发射光谱强度高于6、12和24 at.% Eu添加的WO ₃荧光粉的红色发射光谱强度激发波长为 394 和 465 nm 的复合材料。另一方面，在254nm紫外光激发下，单相磷光体的发射强度低于Eu掺杂的WO ₃ -Eu ₂ (WO ₄ ) ₃复合材料。因此，我们提出了两种预期的磷光体，用作各种波长的红色磷光体。