1. Centre for Advanced Optoelectronic Functional Materials Research and Key Laboratory for UV Light-Emitting Materials and Technology of Ministry of Education
2. Northeast Normal University
3. Changchun 130024
4. China
5. State Key Laboratory of Metastable Materials Science and Technology
6. Departamento de Física de la Materia Condensada
7. Universidad del País Vasco-Euskal Herriko Unibertsitatea
8. UPV/EHU
9. 48080 Bilbao
10. Spain