文献类型：期刊文献

英文题名：Large cyano- and triazine-substituted D-π-A-π-D structures as efficient AIEE solid emitters with large two-photon absorption cross sections

作者：Huang, Wei[1,2];Tang, Fansheng[1,2];Li, Bo[3];Su, Jianhua[1,2];Tian, He[1,2]

机构：[1]E China Univ Sci & Technol, Key Lab Adv Mat, Shanghai 200237, Peoples R China;[2]E China Univ Sci & Technol, Inst Fine Chem, Shanghai 200237, Peoples R China;[3]E China Univ Sci & Technol, Minist Educ, Key Lab Polar Mat & Devices, Shanghai 200241, Peoples R China

年份：2014

卷号：2

期号：6

起止页码：1141

外文期刊名：JOURNAL OF MATERIALS CHEMISTRY C

收录：;EI(收录号：20140517240231);WOS:【SCI-EXPANDED(收录号:WOS:000329993300021)】；

基金：This work was supported by NSFC/China and the National Basic Research 973 Program.

语种：英文

外文关键词：Photons - Charge transfer - Organic polymers - Quantum efficiency - Two photon processes - Synthesis (chemical)

摘要：A series of new large pi-conjugated molecules including diphenylamine and carbazole have been synthesized and characterized (3a-c). All compounds display aggregation-induced emission enhancement (AIEE) characteristics: exhibiting weak fluorescence in pure THF, while a significant AIEE effect is observed in mixtures with a water fraction (f(w)) of 90% with a sharp increase in fluorescence intensity. Combining intramolecular charge transfer (ICT) characteristics and AIEE features, 3a-c are intense solid emitters (589 nm, 546 nm and 556 nm, respectively) with high quantum efficiencies of 18.1%, 27.4% and 14.9%, respectively. Their two-photon absorption (2PA) properties have been investigated using the open-aperture Z-scan technique, and the values of the 2PA cross section at 800 nm for 3a-c are 1363 GM, 413 GM and 5782 GM, respectively. Their excellent 2PA properties and solid quantum efficiencies pave the way for their potential use in biophotonic and optoelectronic applications.