KLn(MoO4)2 micro/nanocrystals (Ln = La-Lu, Y): systematic hydrothermal crystallization, structure, and the performance of doped Eu3+ for optical thermometry.
KLn(MoO4)2 micro/nanocrystals (Ln = La-Lu, Y): systematic hydrothermal crystallization, structure, and the performance of doped Eu3+ for optical thermometry.
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DOI：
10.1039/d1dt03642d
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发表时间：
2021-11
影响因子：
4
通讯作者：
Zhixin Xu;Panpan Du;Q. Zhu;Xiaodong Li;Xudong Sun;Ji-guang Li
中科院分区：
文献类型：
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作者：
Zhixin Xu;Panpan Du;Q. Zhu;Xiaodong Li;Xudong Sun;Ji-guang Li
该工作在pH=7、Mo/Ln摩尔比R=5和200℃的优化条件下，通过水热反应实现了镧系元素（不含Pm）和Y族KLn（MoO4）2双钼酸盐微/纳米晶体的系统结晶，清楚地揭示了镧系元素收缩对相偏好、微晶形貌（尺寸/形状）和晶体结构的内在影响。延伸合成还制备了KLa1-xEux(MoO4)2 (KLM:xEu)和KY1-yEuy(MoO4)2 (KYM:yEu)红色荧光粉，详细的光谱分析发现，斜方KYM的层状结构使得Eu3+具有~70 at% (y = 0.7)的高猝灭含量以及更高的发光量子效率和热稳定性。应用还表明，KYM:0.7Eu 最佳荧光粉具有利用 Eu3+ 热耦合 5D0 和 5D1 能级进行光学温度传感的潜力。
Systematic crystallization of KLn(MoO4)2 double molybdate micro/nanocrystals was achieved in this work for the family of lanthanide elements (excluding Pm) and Y via hydrothermal reaction under the optimized conditions of pH = 7, Mo/Ln molar ratio R = 5 and 200 °C, with which the intrinsic influence of lanthanide contraction on phase preference, crystallite morphology (size/shape) and crystal structure was clearly revealed. Extended synthesis also produced KLa1-xEux(MoO4)2 (KLM:xEu) and KY1-yEuy(MoO4)2 (KYM:yEu) red phosphors, and detailed spectral analysis found that the layered structure of orthorhombic KYM allows Eu3+ to have a high quenching content of ∼70 at% (y = 0.7) and higher quantum efficiency and thermal stability of luminescence. Application also indicated that the KYM:0.7Eu optimal phosphor has the potential for optical temperature sensing with the thermally coupled 5D0 and 5D1 energy levels of Eu3+.