1. Xiamen Key Laboratory of Optoelectronic Materials and Advanced Manufacturing Institute of Luminescent Materials and Information Displays College of Materials Science and Engineering Huaqiao University Xiamen 361021 China
2. Faculty of Applied Sciences Department of Radiation Science and Technology Delft University of Technology Mekelweg 15 2629JB Delft The Netherlands
3. School of Physics and Optoelectronics Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques Guangdong Engineering Technology Research and Development Center of Special Optical Fiber Materials and Devices The State Key Laboratory of Luminescent Materials and Devices South China University of Technology Guangzhou 510640 China