Persistent luminescence from purely organic materials is basically triggered by light and electricity,w hichl argely confines its practical applications.Apurely organic AIEgen exhibits not only persistent photoluminescence,b ut also transient and persistent room-temperature mechanoluminescence.B ys imply turning on and off aU Vl amp,t ricolor emission switching between blue,w hite,a nd yelloww as 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 af undamental principle for the development of new pML materials,p roviding an important step forward in expanding the application scope of persistent luminescence.

Persistent luminescence … …from purely organic materials was triggered by mechanical force at room temperature for the first time.Intheir Communication on page 6449 ff., B. Xu, G. Shi, and co-workers show that aw hite-light-emitting AIEgen exhibited not only persistent photoluminescence,but also transient and persistent room-temperature mechanoluminescence (ML). By simply turning on and off the exciting UV light, tricolor emission switching between blue,white,and yellow was also achieved.

Persistente Lumineszenz von rein organischen Materialien kann durch mechanische Kraft bei Raumtemperatur ausgelöst werden. B. Xu, G. Shi et al. demonstrieren in ihrer Zuschrift auf S. 6559, dass ein Weißlicht abgebendes AIEgen nicht nur persistente Photolumineszenz zeigt, sondern auch transiente und persistente Raumtemperatur‐Mechanolumineszenz (ML). Einfaches An‐ und Abschalten des Anregungs‐UV‐Lichtes ermöglicht das Schalten zwischen blauem, weißem und gelbem Leuchten.

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