title: Polymerization-enhanced intersystem crossing: new strategy to achieve long-lived excitons.
abstract: For a singlet-triplet coupled molecular system, the efficiency of forward and reverse intersystem crossing processes can be enhanced by reducing the energy gap between the singlet and triplet excited states (ΔEST ), thus prolonging the exciton lifetimes. This has been proven beneficial for many emerging applications such as molecular luminescence, optoelectronics, and photonics. Here, a strategy is proposed to create small ΔEST by polymerizing fluorescent dye molecules, the efficacy of which is justified by density functional theory calculations and ultrafast spectroscopy. Thus, singlet-triplet exciton communication through polymerization-enhanced intersystem crossing is also proposed.
authors.affiliation: CAS Key Laboratory of Soft Matter Chemistry, Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei, 230026, China.
authors.forename: Xingxing
authors.initials: X
authors.lastname: Sun
authors.forename: Xijun
authors.initials: X
authors.lastname: Wang
authors.forename: Xinyang
authors.initials: X
authors.lastname: Li
authors.forename: Jing
authors.initials: J
authors.lastname: Ge
authors.forename: Qun
authors.initials: Q
authors.lastname: Zhang
authors.forename: Jun
authors.initials: J
authors.lastname: Jiang
authors.forename: Guoqing
authors.initials: G
authors.lastname: Zhang
mesh_terms: D049449:Luminescence; D015394:Molecular Structure; D058105:Polymerization; D013057:Spectrum Analysis
keywords: exciton splitting; intersystem crossing; luminescence; polymerization; ultrafast spectroscopy