State Key Laboratory of Structural Chemistry;
Fujian Institute of Research on the Structure of Matter;
Chinese Academy of Sciences;
Fuzhou 350002;
China;
Fujian Science&Technology Innovation Laboratory for Optoelectronic Information of China;
Fuzhou 350108;
China;
School of Physical Science and Technology;
ShanghaiTech University;
Shanghai 201210;
China;
2D perovskite; Mn^(2+)doped; energy transfer; perovskite LED;