Department of Chemistry and Molecular Biology, University of Gothenburg, Kemigården 4, 412 96, Gothenburg, Sweden.
Nat Commun. 2018 Jun 11;9(1):2273. doi: 10.1038/s41467-018-04736-1.
Strong coupling between light and matter leads to the spontaneous formation of hybrid light-matter states, having different energies than the uncoupled states. This opens up for new ways of modifying the energy landscape of molecules without changing their atoms or structure. Heavy metal-free organic light emitting diodes (OLED) use reversed intersystem crossing (RISC) to harvest light from excited triplet states. This is a slow process, thus increasing the rate of RISC could potentially enhance OLED performance. Here we demonstrate selective coupling of the excited singlet state of Erythrosine B without perturbing the energy level of a nearby triplet state. The coupling reduces the triplet-singlet energy gap, leading to a four-time enhancement of the triplet decay rate, most likely due to an enhanced rate of RISC. Furthermore, we anticipate that strong coupling can be used to create energy-inverted molecular systems having a singlet ground and lowest excited state.
强耦合将光与物质联系在一起，导致混合光物质状态的自发形成，其能量与非耦合状态不同。这为在不改变分子原子或结构的情况下修改分子的能量景观提供了新的方法。不含重金属的有机发光二极管（OLED）使用反向系间窜越（RISC）从激发的三重态中收集光。这是一个缓慢的过程，因此增加 RISC 的速率可能会提高 OLED 的性能。在这里，我们证明了 Erythrosine B 的激发单线态的选择性耦合，而不会干扰附近三重态的能级。这种耦合降低了三重态-单线态的能隙，导致三重态衰减速率提高了四倍，这很可能是由于 RISC 速率的提高。此外，我们预计强耦合可以用于创建具有单线态基态和最低激发态的能量反转分子系统。
