Jia Hong, Zhou Yiping, Wang Xiaoyan, Zhang Weiying, Feng Xun, Li Zhiang, Fu Hongzhi, Zhao Jianguo, Liu Zhongli, Liu Xiaofeng
College of Physics and Electronic Information & Henan Key Laboratory of Electromagnetic Transformation and Detection, Luoyang Normal University Luoyang 471934 China
School of Materials Science and Engineering, Zhejiang University Hangzhou 310027 China.
RSC Adv. 2018 Nov 14;8(67):38410-38415. doi: 10.1039/c8ra07137c.
Sodium iron fluoride (NaFeF) is a colorless ferromagnetic fluoride with a monoclinic crystal structure (space group 21/), and it is expected to be an ideal platform for exploring magneto-optical interactions. In the present work, Eu doped NaFeF micro-powders were synthesized by a hydrothermal method, and the structures were examined by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The optical properties were examined using UV-Vis spectra and fluorescence spectra, and the results show that the emission spectra can be finely tuned by the hydrothermal reaction temperature and doping concentration of Eu ions. We found that NaFeF doped with 5% Eu synthesized at 196 °C exhibited the optimal red emission under excitation at 395 nm. The magnetization of NaFeF:5% Eu decreased rapidly from about 7.85 emu g at 5 K to 0.4 emu g at 60 K, then slowly decreased with temperature increase from 60 K to 300 K. This Eu doped NaFeF powder is expected to find potential applications in the field of magneto-optical modulation and relevant devices.
氟化铁钠（NaFeF）是一种具有单斜晶体结构（空间群21/）的无色铁磁氟化物，有望成为探索磁光相互作用的理想平台。在本工作中，采用水热法合成了铕掺杂的NaFeF微粉，并通过X射线衍射（XRD）和扫描电子显微镜（SEM）对其结构进行了研究。利用紫外可见光谱和荧光光谱对光学性质进行了研究，结果表明，发射光谱可通过水热反应温度和铕离子掺杂浓度进行精细调节。我们发现，在196℃合成的掺杂5%铕的NaFeF在395nm激发下表现出最佳的红色发射。NaFeF:5% Eu的磁化强度在5K时从约7.85emu g迅速降至60K时的0.4emu g，然后随着温度从60K升高到300K而缓慢下降。这种铕掺杂的NaFeF粉末有望在磁光调制及相关器件领域找到潜在应用。
