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题名: Supramolecular Structure-Dependent Thermally-Activated Delayed Fluorescence (TADF) Properties of Organic Polymorphs
作者: Zhang, Yuewei1; Ma, Huili2; Wang, Shipan1; Li, Zhiqiang1; Ye, Kaiqi1; Zhang, Jingying1; Liu, Yu1; Peng, Qian3; Wang, Yue1
刊名: JOURNAL OF PHYSICAL CHEMISTRY C
发表日期: 2016-09-08
卷: 120, 期:35, 页:19759-19767
收录类别: SCI
英文摘要: The increasing demand for high-performance organic light-emitting devices (OLEDs) based on thermally-activated delayed fluorescence (TADF) principle urgently requires to establish an efficient preparation strategy of high-performance TADF materials. Although considerable progress has been made in molecular design approaches for TADF materials it stil remains an unaddressed issue how molecular aggregated states or supramolecular structures determine the TADF property of organic solids. Hernia, we present an organic molecule 3-(10H-phenoxazin-10-yl)-9H-xanthen-9-one (3-PXZ-XO) with TADF and polymorph characteristics. Three kinds of 3-PXZ-XO based crystals A, B, and C with different TADF properties were obtained. The three crystals display obviously different emission maxima (lambda(em,max): 535 rim for A, 555 nm for B, and 576 nm for C), photo-luminescence (PL) quantum yields (Phi: 51% for A, 28% for B, and 32% for C), and delayed lifetimes of excited states (tau(TADF): 914 ns for A, 774 ns for B, and 994 ns for C). Single-crystal X-ray, diffraction analyses, revealed that in A, B, and C there are different intermolecular pi center dot center dot center dot pi stacking interaction modes. between the adjacent donor planes or acceptor planes. The different TADF properties of the three polymorphs are mainly attributed to their different supramolecular structures. Appropriate donor...donor and acceptor...acceptor stacking interactions inducing aggregation structures can strongly enhance TADF property of organic solids.
语种: 英语
内容类型: 期刊论文
URI标识: http://ir.iccas.ac.cn/handle/121111/35247
Appears in Collections:有机固体实验室_期刊论文

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作者单位: 1.Jilin Univ, Coll Chem, State Key Lab Supramol Struct & Mat, Changchun 130012, Peoples R China
2.Tsinghua Univ, Dept Chem, Key Lab Organ OptoElect & Mol Engn, Beijing 100084, Peoples R China
3.Chinese Acad Sci, Inst Chem, Key Lab Organ Solids, Beijing 100190, Peoples R China
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