^aFujian Engineering Research Center for Solid-State Lighting, Department of Electronic Science, School of Electronic Science and Engineering, Xiamen University, Xiamen 361005, China

^bCollege of Physics and New Energy, Xuzhou University of Technology, Xuzhou 221018, China

^cState Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China

^dCollege of Physical Science and Technology, Xiamen University, Xiamen 361005, China

^eInnovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province (IKKEM), Xiamen 361102, China