Persistent luminescence from purely organic materials is basically triggered by light and electricity, which largely confines its practical applications. A purely organic AIEgen exhibits not only persistent photoluminescence, but also transient and persistent room‐temperature mechanoluminescence. By simply turning on and off a UV lamp, tricolor emission switching between blue, white, and yellow was achieved. The data from single‐crystal structure analysis and theoretical calculation suggest that mechanism of the observed persistent mechanoluminescence (pML) is correlated with the strong spin–orbit coupling of the bromine atom, as well as the formation of H‐aggregates and restriction of intramolecular motions in noncentrosymmetric crystal structure. These results outline a fundamental principle for the development of new pML materials, providing an important step forward in expanding the application scope of persistent luminescence. Phosphorescence triggered by force: An organic white‐light‐emitting aggregation‐induced emission luminogen (AIEgen) with fluorescence–phosphorescence dual‐emission exhibits transient and persistent mechanoluminescence at room temperature. By simply turning a UV lamp on and off, the luminophore shows tricolor emission switching between blue, white, and yellow, which is promising for anticounterfeiting applications.