Due to its bright tunable emission, Eu-doped yttrium silicates are very interesting materials for LED applications. The microparticles of α-Y_1.98 Eu_0.02 Si₂O₇ and the low-temperature phase of Y_1.98 Eu_0.02 SiO₅ (X1) were prepared by sol gel technique. Then, the samples were reduced at high temperatures using pure hydrogen as reduction agent. The materials obtained were characterized by X-Ray diffraction, Scanning Electron Microscopy, Energy Dispersive X-Ray and Photoluminescence spectroscopy. The presence of Eu²⁺ in the materials after the reduction was confirmed by the blue-green band emission and the wide absorption band, observed only in the excitation spectra of the reduced samples. These bands are congruent with the information previously reported in the literature. A red shift of the broadband emission of Eu²⁺ doped α-Y₂Si₂O₇ system was observed compared to previously reported results. Also, the luminescent properties of Eu²⁺ host in X1-Y₂SiO₅ are presented for first time. The relative contribution of Eu²⁺ and Eu³⁺ depends on the excitation wavelength leading to a tunable emission phosphor with potential application in white LEDs. Summarizing, the reduction of Eu ions in yttrium silicates is presented in this work, leading to a tunable emission phosphor with potential application in white LEDs.

由于其可发射的光很明亮，掺bright的硅酸钇钇是LED应用中非常有趣的材料。通过溶胶凝胶法制备了α- _Y1.98 Eu _0.02 Si ₂ O ₇微粒和Y _1.98 Eu _0.02 SiO ₅（X 1）的低温相。然后，使用纯氢作为还原剂在高温下还原样品。通过X射线衍射，扫描电子显微镜，能量色散X射线和光致发光光谱对获得的材料进行表征。Eu ²⁺的存在还原后的材料中的蓝绿色由蓝绿色带发射和宽吸收带证实，仅在还原样品的激发光谱中观察到。这些频带与文献中先前报道的信息一致。Eu的宽带发射的红移²⁺掺杂α-Y ₂的Si ₂ ö ₇与先前报道的结果中观察到的系统。另外，首次提出了X1-Y ₂ SiO ₅中Eu ²⁺主体的发光性质。Eu ²⁺和Eu ³⁺的相对贡献取决于激发波长，从而导致可调谐发射磷光体在白光LED中的潜在应用。综上所述，这项工作提出了还原钇硅酸钇中Eu离子的方法，从而产生了可调谐发射磷光体，并有望在白光LED中应用。