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However, their mechanical rigidity and brittleness impede the applications in flexible and wearable optoelectronic devices. Here, photoluminescence (PL) emission from 2,6\u2010diphenylanthracene (DPA) single crystals is studied under tensile strain, which shows PL enhancement by more than two times with a strain of \u22481.42%. Such a tension induced PL enhancement is reversible, exhibiting no clear optical degradations during 100 cycles of bending and recovery processes. Theoretical calculations reveal that the deformation of molecular structure under strain induces a decrease of the dihedral between anthracene and benzene moieties in DPA molecules. Further, the increased molecular conjugation enhances the molecular oscillator strength, leading to the brightened PL emission. Meanwhile, with the decreased dihedral, the molecular vibrations in DPA crystals are suppressed, which can reduce the non\u2010radiative decay rate. In contrast, no tension induced PL enhancement is observed in polycrystalline DPA thin films as the strain can be released via the grain boundaries. This study highlights the superior optical performance of DPA single crystals under strain field, which will provide new possibilities for DPA\u2010based flexible devices.<\/jats:p>","DOI":"10.1002\/smll.202403035","type":"journal-article","created":{"date-parts":[[2024,7,19]],"date-time":"2024-07-19T04:17:57Z","timestamp":1721362677000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Tension Induced Photoluminescence Enhancement in an Organic Single Crystal"],"prefix":"10.1002","volume":"20","author":[{"given":"Chunjiao","family":"Wang","sequence":"first","affiliation":[{"name":"Institute of Functional Nano &amp; Soft Materials (FUNSOM) Soochow University  Suzhou Jiangsu 215123 P. R. 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