Brightly Tricolored Mechanochromic Luminescence from a Single‐Luminophore Liquid Crystal: Reversible Writing and Erasing of Images

A glowing image : The photoluminescent colors reddish‐orange, yellow, and green, are generated from a single liquid‐crystalline mixture containing one luminophore (see picture). The colors are easily distinguished by the naked eye and can be reversibly written and erased. Moreover, these luminescent colors can be switched by mechanical and thermal stimuli.