1. China‐Germany Research Center for Photonic Materials and DevicesState Key Laboratory of Luminescent Materials and DevicesGuangdong Provincial Key Laboratory of Fiber Laser Materials and Applied TechniquesSchool of Materials Science and EngineeringSouth China University of Technology Guangzhou 510640 China
2. Otto Schott Institute of Materials ResearchAbbe Center of PhotonicsUniversity of Jena 07743 Jena Germany
3. Key Laboratory of Processing and Testing Technology of Glass & Functional CeramicsQilu University of Technology 250353 Jinan China
4. Department of Chemistry and BioscienceAalborg University Fibigerstraede, 16 ,9220 Aalborg Denmark