Double Laser Analysis of Emissive Biracials and Development of "Organic Radical Light-Emitting Diode"

准确评价TMM双自由基的荧光性能是有机自由基发光二极管发展的必然课题之一。然而，传统的方法是不适用的，因为TMM双自由基是短寿命的中间体。本工作采用双激光闪光光解和多种方法制备TMM双自由基，研究了TMM双自由基的荧光性质。虽然光诱导电子转移反应是无效的，由于单一的电子转移猝灭的激发TMM与敏化剂，我们成功地评估了荧光性质的TMM双自由基通过利用分子内或分子间的能量转移反应。另外，通过本研究，我们发现了亚甲基环丙烷衍生物的“激发态C-C键断裂-发射”现象。

Accurate evaluation of fluorescence properties of the trimethylenemethane (TMM) biradicals is one of the inevitable subjects to develop the organic radical light-emitting diode. However, conventional method is not applicable because the TMM biradicals are short-lived intermediates. In this work, we studied fluorescence properties of the TMM biradicals by employing double laser flash photolysis and various methods to generate the TMM biradicals. Although photoinduced electron-transfer reaction is not effective owing to single electron-transfer quenching of the excited TMM with sensitizer, we successfully evaluated the fluorescence properties of the TMM biradicals by utilizing intra- or intermolecular energy-transfer reaction. In addition, through this study, we discovered an "excited state C-C bond cleavage-emission" phenomenon of methylenecyclopropane derivatives.