1. State Key Laboratory of Physical Chemistry of Solid Surface, Fujian Key Laboratory of Surface and Interface Engineering for High Performance Materials, and College of Materials, Xiamen University, Simingnan-Road 422, Xiamen 361005, China
2. Baotou Research Institute of Rare Earths, Huanghe-Avenue 36, Baotou 014060, China
3. College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
4. iRay Technology Company Limited, Jinhai-Road 1000, Shanghai 201206, China
5. iRay Technology (Taicang) Limited, Xinggang-Road 33, Taicang 215434, China