Ap henothiazine derivative of FCO-CzS with changeable mechanoluminescence is reported, which,u pon continuous mechanical stimulus,s hows mechanoluminescent emission from blue to white and yellow.Careful analysis of the experimental results,c oupled with the well-understood photoluminescence theory,s how that the molecular conformation transition of the phenothiazine group from quasi-axial to quasi-equatorial is responsible for this dynamic mechanoluminescence effect.