Guangdong Provincial Key Laboratory of, Optical Information Materials and Technology &, Institute of Electronic Paper Displays, South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou, 510006, P. R. China.
School of Chemistry and Materials Science, Nanjing Normal University, Nanjing, 210023, P. R. China.
Chemistry. 2023 May 22;29(29):e202203947. doi: 10.1002/chem.202203947. Epub 2023 Apr 5.
Singlet fission (SF) has been proven to be an effective strategy to overcome the Shockley-Queisser limit of photovoltaics. However, the materials suitable for SF are relatively rare due to the strict requirements for the occurrence of this process. In the present study, we report the first preparation of two heteroatoms (O and S)-doped polycyclic aromatic hydrocarbons (PAHs) molecules with (β, β) connected furan/thiophene ring. The optical and physiochemical properties of both compounds are investigated by a variety of spectroscopies, including UV-vis absorption, photoluminescence and cyclic voltammetry. In addition, their ultrafast excited state dynamics are studied by femtosecond transient absorption. Experimental data showed that the singlet fission efficiency was improved by 2 times when replacing oxygen with sulfur atom, which could provide some guidelines in designing singlet fission materials with better efficiency.
单线态裂变 (SF) 已被证明是克服光伏的肖克利-奎塞尔限制的有效策略。然而，由于该过程发生的严格要求，适合 SF 的材料相对较少。在本研究中，我们报告了首例具有（β，β）连接的呋喃/噻吩环的两种杂原子（O 和 S）掺杂多环芳烃（PAHs）分子的制备。通过多种光谱学方法，包括紫外-可见吸收、光致发光和循环伏安法，研究了两种化合物的光学和物理化学性质。此外，通过飞秒瞬态吸收研究了它们的超快激发态动力学。实验数据表明，用硫原子取代氧原子可将单线态裂变效率提高 2 倍，这可为设计具有更好效率的单线态裂变材料提供一些指导。
