Guangxi Key Laboratory for Relativistic Astrophysics;
Center On Nanoenergy Research;
School of Physical Science and Technology;
Guangxi University;
Nanning 530004;
China;
Beijing Institute of Nanoenergy and Nanosystems;
National Center for Nanoscience and Technology;
Chinese Academy of Sciences;
Beijing 100083;
China;
Magnetic field; Lanthanide ions; Luminescence; Microscopic mechanism;