Large cyano- and triazine-substituted D–π–A–π–D structures as efficient AIEE solid emitters with large two-photon absorption cross sections
Large cyano- and triazine-substituted D–π–A–π–D structures as efficient AIEE solid emitters with large two-photon absorption cross sections
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DOI：
10.1039/c3tc31913j
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发表时间：
2014-01
影响因子：
6.4
通讯作者：
Wei Huang;F. Tang;Bo Li;Jianhua Su;H. Tian
中科院分区：
文献类型：
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作者：
Wei Huang;F. Tang;Bo Li;Jianhua Su;H. Tian
一系列新的大π共轭分子包括二苯胺和咔唑已被合成和表征（3a-c）。所有化合物均表现出聚集诱导发射增强 (AIEE) 特性：在纯 THF 中表现出弱荧光，而在水含量 (fw) 为 90% 的混合物中观察到显着的 AIEE 效应，且荧光强度急剧增加。结合分子内电荷转移（ICT）特性和 AIEE 特性，3a-c 是强固体发射体（分别为 589 nm、546 nm 和 556 nm），量子效率分别为 18.1%、27.4% 和 14.9%。使用开孔 Z 扫描技术研究了它们的双光子吸收 (2PA) 特性，3a-c 在 800 nm 处的 2PA 截面值分别为 1363 GM、413 GM 和 5782 GM。它们优异的 2PA 特性和固体量子效率为其在生物光子和光电应用中的潜在应用铺平了道路。
A series of new large π-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 (fw) 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.