Abstract Europium-ion doped La2MoO6, Gd2MoO6, Y2MoO6 phosphors were synthesized by hydrothermal method with further calcination. The charge transfer energies of these materials were calculated by chemical bond dielectric theory of complex crystals and the results were consistent with the experiment data (ECT(La2MoO6)>ECT(Gd2MoO6)=ECT(Y2MoO6)). Notably, the larger Ω2 showed the lower symmetrical ligand field and more covalent Eu–O bonds via further Judd-Ofelt theory analysis. The optimal Eu3+ doping concentrations (x = 0.07 for La2MoO6 and Y2MoO6, y = 0.15 for Gd2MoO6) and corresponding decay times (475 us for La2MoO6:0.07Eu3+, 679 us for Gd2MoO6:0.15Eu3+ and 474 us for Y2MoO6:0.07Eu3+) were investigated. Moreover, the CIE coordinates of the as-prepared phosphors were close to the standard red light, which manifested great promise for white light-emitting devices (WLED). More importantly, our work will be anticipated to provide some guide for the choice of the materials, which is meaningful in the WLED field.

中文翻译：

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研究 Eu3+ 掺杂的 Ln2MoO6 (Ln3+= La3+, Gd3+, Y3+) 荧光粉用于暖 WLED 的发光机制

摘要 采用水热法进一步煅烧合成了掺铕离子的La2MoO6、Gd2MoO6、Y2MoO6荧光粉。利用复杂晶体的化学键介电理论计算了这些材料的电荷转移能，结果与实验数据一致(ECT(La2MoO6)>ECT(Gd2MoO6)=ECT(Y2MoO6))。值得注意的是，通过进一步的 Judd-Ofelt 理论分析，较大的 Ω2 显示出较低的对称配体场和更多的 Eu-O 共价键。最佳 Eu3+ 掺杂浓度（La2MoO6 和 Y2MoO6 的 x = 0.07，Gd2MoO6 的 y = 0.15）和相应的衰减时间（La2MoO6 为 475 us：0.07Eu3+，Gd2MoO6 为 679 us：0.15Eu3+ 和 Y.374Eu3+）为调查。此外，所制备的荧光粉的 CIE 坐标接近标准红光，这显示出白光发光器件 (WLED) 的巨大前景。更重要的是，我们的工作有望为材料的选择提供一些指导，这在 WLED 领域具有重要意义。