Oh Inhwan, Lee Hosoowi, Kim Tae Wu, Kim Chang Woo, Jun Sunhong, Kim Changwon, Choi Eun Hyuk, Rhee Young Min, Kim Jeongho, Jang Woo-Dong, Ihee Hyotcherl
Department of Chemistry Korea Advanced Institute of Science and Technology (KAIST) Daejeon 34141 Republic of Korea.
Center for Nanomaterials and Chemical Reactions Institute for Basic Science (IBS) Daejeon 34141 Republic of Korea.
Adv Sci (Weinh). 2020 Aug 19;7(20):2001623. doi: 10.1002/advs.202001623. eCollection 2020 Oct.
Multichromophore systems (MCSs) are envisioned as building blocks of molecular optoelectronic devices. While it is important to understand the characteristics of energy transfer in MCSs, the effect of multiple donors on energy transfer has not been understood completely, mainly due to the lack of a platform to investigate such an effect systematically. Here, a systematic study on how the number of donors ( ) and interchromophore distances affect the efficiency of energy transfer ( ) is presented. Specifically, is calculated for a series of model MCSs using simulations, a series of multiporphyrin dendrimers with systematic variation of and interdonor distances is synthesized, and s of those dendrimers using transient absorption spectroscopy are measured. The simulations predict in the multiporphyrin dendrimers well. In particular, it is found that is enhanced by donor-to-donor energy transfer only when structural heterogeneity exists in an MCS, and the relationships between the enhancement and the structural parameters of the MCS are revealed.
多发色团体系（MCSs）被视作分子光电器件的构建模块。虽然了解MCSs中能量转移的特性很重要，但多个供体对能量转移的影响尚未完全明晰，主要原因是缺乏一个系统研究这种影响的平台。在此，本文展示了一项关于供体数量（ ）和发色团间距离如何影响能量转移效率（ ）的系统研究。具体而言，通过模拟计算了一系列模型MCSs的 ，合成了一系列供体数量和供体间距离有系统变化的多卟啉树枝状大分子，并使用瞬态吸收光谱法测量了这些树枝状大分子的 。模拟结果很好地预测了多卟啉树枝状大分子中的 。特别地，发现只有当MCS中存在结构异质性时，供体间的能量转移才会提高 ，并且揭示了 提高与MCS结构参数之间的关系。
