Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, Singapore, 117585, Singapore.
PCFM Lab, GDHPPC Lab, Guangdong Engineering Technology, Research Center for High-performance Organic and Polymer Photoelectric, Functional Films, State Key Laboratory of OEMT, School of Chemistry, Sun Yat-sen University, Guangzhou, 510275, China.
Angew Chem Int Ed Engl. 2017 Sep 25;56(40):12160-12164. doi: 10.1002/anie.201705945. Epub 2017 Aug 23.
Persistent room-temperature phosphorescence (RTP) in pure organic materials has attracted great attention because of their unique optical properties. The design of organic materials with bright red persistent RTP remains challenging. Herein, we report a new design strategy for realizing high brightness and long lifetime of red-emissive RTP molecules, which is based on introducing an alkoxy spacer between the hybrid units in the molecule. The spacer offers easy Br-H bond formation during crystallization, which also facilitates intermolecular electron coupling to favor persistent RTP. As the majority of RTP compounds have to be confined in a rigid environment to quench nonradiative relaxation pathways for bright phosphorescence emission, nanocrystallization is used to not only rigidify the molecules but also offer the desirable size and water-dispersity for biomedical applications.
纯有机材料中的室温磷光（RTP）持续引起了极大的关注，因为它们具有独特的光学性质。设计具有明亮红色持续 RTP 的有机材料仍然具有挑战性。在此，我们报告了一种新的设计策略，用于实现高亮度和长寿命的红色发射 RTP 分子，该策略基于在分子中的杂化单元之间引入烷氧基间隔基。该间隔基在结晶过程中易于形成 Br-H 键，这也有利于有利于 RTP 的分子间电子偶联。由于大多数 RTP 化合物必须被限制在刚性环境中以猝灭非辐射弛豫途径以实现明亮的磷光发射，因此纳米结晶不仅用于使分子刚性化，而且还提供用于生物医学应用的理想尺寸和水分散性。
