A novel D-A-D-A-D type molecule based on substituted dihydroindolo [3, 2-b] carbazole with large two-photon absorption cross section and excellent aggregation-induced enhanced emission property

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• 作者：Guojian Tian^a ; Ning Xiang^a ; Haitao Zhou^a ; Yiru Li^a ; Bo Li^b ; Qiaochun Wang^a ; Jianhua Su^a ; ^{bbsjh@ecust.edu.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Dihydroindolo [3 ; 2-b] carbazole ; Two-photon absorption ; Aggregation-induced enhanced emission ; Quantum efficiency
• 刊名：Tetrahedron
• 出版年：2016
• 出版时间：14 January 2016
• 年：2016
• 卷：72
• 期：2
• 页码：298-303
• 全文大小：932 K

文摘

Two novel D-A-D-A-D type molecules T1 and T2 based on substituted dihydroindolo [3, 2-b] carbazole with large two-photon absorption (2PA) cross section and excellent aggregation-induced enhanced emission (AIEE) property have been synthesized and characterized. Both compounds emit weakly fluorescent in THF, while a significant AIEE property is observed in water/THF (v/v 50%/50%) for T1 and water/THF (v/v 90%/10%) for T2 with a sharp increase in fluorescence intensity. The solid fluorescence of T1 and T2 is located at 575 nm and 588 nm, and their quantum efficiencies are determined to be 3.2% and 5.8%, respectively. The corresponding 2PA cross section values for T1 and T2 at 800 nm are 867 GM and 1300 GM by the open-aperture Z-scan technique. These excellent performances of both compounds make them as attractive alternatives for biophotonic and optoelectronic applications.