Diboraanthracene-Doped Polymer Systems for Colour-Tuneable Room-Temperature Organic Afterglow |
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Authors: | Justina Jovai?ait? Sven Kirschner Steponas Rai?ys Gediminas Kreiza Paulius Baronas Saulius Jur??nas Matthias Wagner |
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Institution: | 1. Institute of Photonics and Nanotechnology, Vilnius University, Saul?tekis av. 3, 10257 Vilnius, Lithuania;2. Institut für Anorganische Chemie, Goethe-Universität Frankfurt, Max-von-Laue-Strasse 7, 60438 Frankfurt a. Main, Germany |
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Abstract: | Organic ultralong room temperature phosphorescence (RTP), or organic afterglow, is a unique phenomenon, gaining widespread attention due to its far-reaching application potential and fundamental interest. Here, two laterally expanded 9,10-dimesityl-dihydro-9,10-diboraanthracene (DBA) derivatives are demonstrated as excellent afterglow materials for red and blue-green light emission, which is traced back to persistent thermally activated delayed fluorescence and RTP. The lateral substitution of polycyclic DBA scaffold, together with weak transversal electron-donating mesityl groups, ensures the optimal molecular properties for (reverse) intersystem crossing and long-lived triplet states in a rigid poly(methyl methacrylate) matrix. The achieved afterglow emission quantum yields of up to 3 % and 15 %, afterglow lifetimes up to 0.8 s and 3.2 s and afterglow durations up to 5 s and 25 s (for red and blue-green emitters, respectively) are attributed to the properties of single molecules. |
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Keywords: | Afterglow Doped Polymer Films Information Recording Room Temperature Phosphorescence Thermally Activated Delayed Fluorescence |
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