Recent Advances in Mechanochromic Luminescence of Organic Crystalline Compounds

Mechanochromic luminescence (MCL) refers to a reversible color change of the solid-state emission induced by mechanical stimulus such as grinding, shearing, and compressing. A growing number of MCL materials has recently been reported owing to the wealth of their potential applications in advanced optoelectronic technologies. This review highlights recent progress on the development of organic crystalline compounds that exhibit various MCL behaviors, which include self-recovery of the original color, bathochromically and hypsochromically shifted emission from the same luminophore, two-step emissioncolor switching, and multi-stimuli-responsive emission. In addition, the creation of polymorphic and pseudopolymorphic crystals and the construction of two-component systems as promising strategies to control and improve MCL properties of organic crystals are discussed.

Automated summary

Mechanochromic luminescence (MCL) refers to reversible color changes in solid-state emission caused by mechanical stimulus. Recent research has focused on the development of organic crystalline compounds with various MCL behaviors, including self-recovery, emission shifts, color switching, and multi-stimuli-responsive emission. Strategies like creating polymorphic crystals and two-component systems are discussed for controlling and improving MCL properties in organic crystals.