A novel covalently linked tetracene tetramer was synthesized for the first time. Intramolecular singlet fission (iSF) can be conducted efficiently within this tetramer with the triplet state quantum yield as high as 128% and a lifetime >100 μs in solution. This is the highest iSF yield achieved so far in a tetracene compound in solution, and it is also the only case with a triplet quantum yield exceeding
首次合成了一种新型的共价连接的并四聚物。分子内单线态裂变(iSF)可以在该四聚体中高效进行,三线态量子产率高达128%,溶液中的寿命> 100μs。这是迄今为止在溶液中
并四苯化合物中获得的最高iSF产率,也是三重态量子产率超过100%的唯一情况。在该四聚体中通过iSF形成的三重态的出乎意料的长寿命有利于iSF在太阳能电池中的应用。与具有相似分子结构的并四聚体三聚体相比,这显着提高了iSF效率,这可以归因于该分子中单重态激子的增强的离域作用。