Angewandte Chemie International Edition | VOL. 62
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Diboraanthracene‐Doped Polymer Systems for Colour‐Tuneable Room‐Temperature Organic Afterglow

Publication Date Dec 14, 2022

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.

Concepts

Room Temperature Phosphorescence Blue-green Light Emission Long-lived Triplet States Organic Afterglow Afterglow Durations Rigid Poly Blue-green Emission Methyl Methacrylate Red Light Emission Organic Phosphorescence

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