文献类型：期刊文献

英文题名：White Light Luminescence from a Homo-conjugated Molecule with Thermally Activated Delayed Fluorescence

作者：Zhou, Ying[1];Li, Yao[2];Zhang, Rong[1];Zhao, Dahui[2];Yan, Qifan[1]

机构：[1]East China Univ Sci & Technol, Sch Chem & Mol Engn, Key Lab Adv Mat, Shanghai 200237, Peoples R China;[2]Peking Univ, Beijing Natl Lab Mol Sci, Ctr Soft Matter Sci & Engn, Key Lab Polymer Chem & Phys,Minist Educ,Coll Chem, Beijing 100871, Peoples R China

年份：2021

卷号：16

期号：14

起止页码：1893

外文期刊名：CHEMISTRY-AN ASIAN JOURNAL

收录：;EI(收录号：20212310471924);WOS:【SCI-EXPANDED(收录号:WOS:000656609200001)】；

基金：The work is financially supported by the National Natural Science Foundation of China (Nos. 21602061, 21925501). The authors thank the High-performance Computing Platform of Peking University for the computational resources.

语种：英文

外文关键词：thermally activated delayed fluorescence (TADF); Homo-conjugated molecule; donor-acceptor systems; luminescence

摘要：Luminophores with tunable emission properties are appealing due to various applications. Among those properties, thermally activated delayed fluorescence (TADF) has been attracting enormous research interests. Herein, we synthesized a 9,9'-spirobifluorene based homo-conjugated molecule 1, which connects a diphenylamino moiety as electron donor and a naphthalimide group as electron acceptor via 2,2'-positions of spirofluorene. Compound 1 displays dual emission behaviour with both blue and orange fluorescence. The one orange fluorescence around 555 nmshows sensitivity to oxygen and a prolonged lifetime of 284 ns in degassed toluene. Such characteristics imply TADF nature for this emission from a charge-transfer excited state. The other emission at 440 nm with blue colour displayed resistance to oxygen quenching and a normal fluorescence lifetime of 1.5 ns. Compared with control molecule, this emission band is assigned as conventional fluorescence from a localized excited state. In addition, dual emission property allows molecule 1 to be modulated to emit white photoluminescence in thin film with a CIE color coordinate of (0.25, 0.33).