Xu Zhixin, Du Panpan, Zhu Qi, Li Xiaodong, Sun Xudong, Li Ji-Guang
Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), School of Materials Science and Engineering, Northeastern University, Shenyang, Liaoning 110819, China.
Research Center for Functional Materials, National Institute for Materials Science, Namiki 1-1, Tsukuba, Ibaraki 305-0044, Japan.
Dalton Trans. 2021 Dec 7;50(47):17703-17715. doi: 10.1039/d1dt03642d.
Systematic crystallization of KLn(MoO) double molybdate micro/nanocrystals was achieved in this work for the family of lanthanide elements (excluding Pm) and Y hydrothermal reaction under the optimized conditions of pH = 7, Mo/Ln molar ratio = 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 KLaEu(MoO) (KLM:Eu) and KYEu(MoO) (KYM:Eu) red phosphors, and detailed spectral analysis found that the layered structure of orthorhombic KYM allows Eu to have a high quenching content of ∼70 at% ( = 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 D and D energy levels of Eu.
