The invention provides a manganese-based complex, and belongs to the field of complex materials and crystalline materials. A chemical formula of the manganese-based complex is {[Mn0.5(AIPA)(H2O)]}8, and AIPA is 5-aminoisophthalic acid. In the complex structure of the manganese-based complex, organic phosphors and metal ions (manganese) can fix the organic phosphors in the rigid skeleton of the complex by a coordination force, the intramolecular movement of the phosphors are prevented, thermal vibrations necessary for triplet non-radiation attenuating are limited, while enhancing the spin-orbitcoupling of a system, and promoting inter-system turbulence and triplet generation, thereby achieving long-life room temperature phosphorescence and effective exciton migration, the manganese-based complex provided has a long triplet lifetime, the exciton lifetime and migration distances are prolonged, thereby improving the photoelectric conversion efficiency, and the method has an important practical application value.