余辉
磷光
系统间交叉
光化学
荧光
有机发光二极管
兴奋剂
材料科学
化学
聚合物
单重态
光电子学
纳米技术
原子物理学
激发态
光学
物理
复合材料
图层(电子)
天文
伽马射线暴
作者
Justina Jovaišaitė,Sven Kirschner,Steponas Raišys,Gediminas Kreiza,Paulius Baronas,Saulius Juršėnas,Matthias Wagner
标识
DOI:10.1002/anie.202215071
摘要
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.
科研通智能强力驱动
Strongly Powered by AbleSci AI