Institute of Optoelectronics Technology,and Key Laboratory of Luminescence and Optical Information,Beijing Jiantong University,Beijing 100044;
Departamento de Física,Instituto Superior de Engenharia do Porto,Rua Dr. Ant6nio Bernardino de Ahneida 431,4200-072 Porto,Portugal;
Centro de Ffsica,Universidade do Minho,Campus de Azurem,4800-058 Guimarāes,Portugal;
Institute of Optoelectronics Technology,and Key Laboratory of Luminescence and Optical Information,Beijing Jiantong University,Beijing 100044;
Departamento de Física,Instituto Superior de Engenharia do Porto,Rua Dr. Ant6nio Bernardino de Ahneida 431,4200-072 Porto,Portugal;
Centro de Ffsica,Universidade do Minho,Campus de Azurem,4800-058 Guimarāes,Portugal;
Centro de Ffsica,Universidade do Minho,Campus de Azurem,4800-058 Guimarāes,Portugal;
Thin Film Center,University of Paisley,Paisley PAl 2BE,Scotland;
Institute of Optoelectronics Technology,and Key Laboratory of Luminescence and Optical Information,Beijing Jiantong University,Beijing 100044;