Lanthanide (Ln³⁺)-doped A₂M₃O₁₂ negative thermal expansion (NTE) materials have gained increasing interest owing to their ability to resist thermal quenching. However, several issues limit their practical application, such as a high hygroscopicity and a poor understanding of the influence of M-site cations on the luminescence thermal response. Herein, we synthesized and characterized 9 mol% Nd³⁺:Yb₂Mo_3(1-x)W_3xO₁₂ phosphor powders and their corresponding phosphor-in-glass (PiG) composites. The results demonstrate that Yb₂W₃O₁₂ exhibits superior NTE characteristics compared to Yb₂Mo₃O₁₂, attributable to the weaker attractive energy of the W–O bond. Upon 980 nm excitation, the Nd³⁺: ⁴F_j → ⁴I_9/2 (j = 7/2, 5/2, 3/2) emissions significantly intensify with increasing temperature, especially in Nd³⁺:Yb₂W₃O₁₂, which correlates with its higher phonon energy and enhanced NTE. Incorporating Yb₂M₃O₁₂ (M = Mo, W) powders into a silicate glass matrix effectively improves the water resistance of the materials. Using the intensity ratio of the Nd³⁺: ⁴F_7/2 → ⁴I_9/2 and Yb³⁺: ²F_5/2 → ²F_7/2 transitions for optical thermometry, the PiG-Yb₂W₃O₁₂ and PiG-Yb₂Mo₃O₁₂ composites achieve maximum relative sensing sensitivities of approximately 4.52 and 3.88%K⁻¹, respectively, surpassing those of their pristine phosphor counterparts. These findings provide valuable insights for enhancing the performance of Ln³⁺-doped A₂M₃O₁₂-type NTE materials.

中文翻译：

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Nd3+ 掺杂 Yb2M3O12 （M = Mo， W） 荧光粉和玻璃荧光粉复合材料中的抗热猝灭发光和耐水性


镧系元素 （Ln³⁺） 掺杂的 A₂M₃O₁₂ 负热膨胀 （NTE） 材料因其抗热淬火的能力而受到越来越多的关注。然而，有几个问题限制了它们的实际应用，例如高吸湿性和对 M 位阳离子对发光热响应的影响了解不足。在此，我们合成并表征了 9mol% Nd³⁺：Yb₂Mo_3（1-x）W_3xO₁₂ 荧光粉及其相应的荧光粉玻璃 （PiG） 复合材料。结果表明，与 Yb₂Mo₃O₁₂ 相比，Yb₂W₃O₁₂ 表现出优异的 NTE 特性，这归因于 W-O 键的吸引力较弱。在 980nm 激发下，Nd³⁺：⁴F → ⁴I_9/2 （j = 7/2， 5/2， 3/2） 发射随着温度的升高而显著增强，尤其是在 Nd³⁺：Yb₂W₃O₁₂ 中，这与其较高的声子能量和增强的 NTE 相关。将 Yb₂M₃O₁₂ （M = Mo， W） 粉末掺入硅酸盐玻璃基体中，可有效提高材料的耐水性。使用用于光学测温的 Nd³⁺：⁴F_7/2 → ⁴I_9/2 和 Yb³⁺：²F_5/2 → ²F_7/2 转变的强度比，PiG-Yb₂W₃O₁₂ 和 PiG-Yb₂Mo₃O₁₂ 复合材料实现了大约 4.52% 和 3.88%^K-1 的最大相对传感灵敏度，分别超过了原始荧光粉的同类产品。 这些发现为提高 Ln³⁺ 掺杂 A₂M₃O₁₂ 型 NTE 材料的性能提供了有价值的见解。