[Pt(bpy)(DPMACS2)]2Cl2•3H2O (1•3H2O) (bpy = 2,2'-bipyridine, DPMACS2 = di(4-pyridylmethyl)aminedithiocarbamate) was synthesized and characterized by X-ray diffraction studies, and its crystal structure displayed intermolecular Pt(II)···Pt(II) contacts of 3.471 and 5.065 Å. Upon excitation, 1•3H2O showed broad luminescence at 538 nm, which was red-shifted and enhanced to 560 nm while cooling to 77 K. To this end, the B3LYP/LanL2DZ calculation results were performed to clearly explain their excited-state origin. Moreover, complex 1•3H2O displayed a dramatic mechanochromic shift from 538 to 608 nm while grinding, and the above red-shift was also observed while exposed to air within 1 day, suggestive of the simultaneous mechanochromic and solvent-induced luminescence. It is noted that the luminescence almost reverted to the original luminescence at 535-542 nm upon immersion in various solvents for the ground samples of complex 1•3H2O. In addition, the luminescence for the acetone-immersed ground samples returned to 608 nm in 1 min. The possible interactions between halogenated solvents and the free pyridyl groups in DPMACS2, which were not expected for acetone, have been proposed to be responsible for such a dramatic difference in this study.