de Clercq Damon M, Collins Miles I, Sloane Nicholas P, Feng Jiale, McCamey Dane R, Tayebjee Murad J Y, Nielsen Michael P, Schmidt Timothy W
School of Chemistry, ARC Centre of Excellence in Exciton Science, UNSW Sydney NSW 2052 Australia
School of Physics, ARC Centre of Excellence in Exciton Science, UNSW Sydney NSW 2052 Australia.
Chem Sci. 2024 Mar 25;15(17):6402-6409. doi: 10.1039/d3sc06774b. eCollection 2024 May 1.
Singlet fission is an exciton multiplication process that allows for the conversion of one singlet exciton into two triplet excitons. Organic semiconductors, such as acenes and their soluble bis(triisopropylsilylethynyl) (TIPS) substituted counterparts, have played a major role in elucidating the understanding of the underlying mechanisms of singlet fission. Despite this, one prominent member of the acene family that has received little experimental attention to date is TIPS-anthracene, even with computational studies suggesting potential high singlet fission yields in the solid state. Here, time-resolved spectroscopic and magneto-photoluminescence measurements were performed on spin-cast films of TIPS-anthracene, showing evidence for singlet fission. A singlet fission yield of 19% (out of 200%) is estimated from transient absorption spectroscopy. Kinetic modeling of the magnetic field effect on photoluminescence suggests that fast rates of triplet dissociation lead to a low magnetic photoluminescence effect and that non-radiative decay of both the S and (TT) states is the cause for the low triplet yield.
单线态裂变是一种激子倍增过程，它能将一个单线态激子转化为两个三线态激子。有机半导体，如并苯及其可溶性双（三异丙基硅乙炔基）（TIPS）取代的类似物，在阐明单线态裂变潜在机制的理解方面发挥了重要作用。尽管如此，并苯家族中一个至今很少受到实验关注的重要成员是TIPS-蒽，即使计算研究表明其在固态下可能具有较高的单线态裂变产率。在此，对TIPS-蒽的旋涂薄膜进行了时间分辨光谱和磁光致发光测量，结果显示了单线态裂变的证据。通过瞬态吸收光谱估计单线态裂变产率为19%（占200%中的比例）。磁场对光致发光影响的动力学模型表明，快速的三线态解离速率导致低磁光致发光效应，并且单重态（S）和（三线态-三线态）（TT）态的非辐射衰变是三线态产率低的原因。
