Uni-directional multi-state fluorochromic scaffolds are valuable photofunctional molecules and yet scarce.We report a general approach for their design,i.e.,mechanodonor-acceptor coupling(MDAC).A photochromic molecule is a mechanodonor,due to its capability to convert photonic energy into mechanical force.Upon proper coupling,it can be used to drive a mechanochromic molecule for uni-directional multi-state fluorochromism.The embodiment of this approach is a rhodamine-dithienylethylene hydride(RDH),which has been successfully employed in super-resolution localization microscopy