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The structural origin of this phenomenon in phosphorescent molecular systems is rarely known and thus the formulation of structure\u2013property relationships remains challenging. Changes in the M\u2013M interactions have been proposed as the main mechanism with d<jats:sup>10<\/jats:sup> coinage metal compounds. Herein, we describe a new mechanism\u2014a mechanically induced reversible formation of a cation\u2013anion exciplex based on Cu\u2013F interactions\u2014that leads to highly efficient mechanochromic phosphorescence and unusual large emission shifts from UV\u2010blue to yellow for Cu<jats:sup>I<\/jats:sup> complexes. The low\u2010energy luminescence is thermo\u2010 and vaporesponsive, thus allowing the generation of white light as well as for recovering the original UV\u2010blue emission.<\/jats:p>","DOI":"10.1002\/anie.201807768","type":"journal-article","created":{"date-parts":[[2018,7,26]],"date-time":"2018-07-26T17:15:07Z","timestamp":1532625307000},"page":"13671-13675","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":120,"title":["Stimulus\u2010Triggered Formation of an Anion\u2013Cation Exciplex in Copper(I) Complexes as a Mechanism for Mechanochromic Phosphorescence"],"prefix":"10.1002","volume":"57","author":[{"given":"Benjamin","family":"Hupp","sequence":"first","affiliation":[{"name":"Institut f\u00fcr Anorganische Chemie Julius-Maximilians-Universit\u00e4t W\u00fcrzburg  Am Hubland 97074 W\u00fcrzburg 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