Aggregation-Induced Emission from Fluorophore鈥換uencher Dyads with Long-Lived Luminescence

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• 作者：Biao Chen ; Xingxing Sun ; Ruffin E. Evans ; Rui Zhou ; James N. Demas ; Carl O. Trindle ; Guoqing Zhang
• 刊名：Journal of Physical Chemistry A
• 出版年：2015
• 出版时间：August 20, 2015
• 年：2015
• 卷：119
• 期：33
• 页码：8854-8859
• 全文大小：375K
• ISSN：1520-5215

文摘

Aggregation-induced emission (AIE) is an important photophysical phenomenon in molecular materials and has found broad applications in optoelectronics, bioimaging, and chemosensing. Currently, the majority of reported AIE-active molecules are based on either propeller-shaped rotamers or donor鈥揳cceptor molecules with strong intramolecular charge-transfer states. Here, we report a new design motif, where a fluorophore is covalently tethered to a quencher, to expand the scope of AIE-active materials. The fluorophore鈥搎uencher dyad (FQD) is nonemissive in solutions due to photoinduced electron-transfer quenching but becomes luminescent in the solid state. The intrinsic emission lifetimes are found to be within the microseconds domain at both room and low temperatures. We performed single-crystal X-ray diffraction measurement for each of the FQDs as well as theoretical calculations to account for the possible origin of the long-lived AIE. These FQDs represent a new class of AIE-active molecules with potential applications in organic optoelectronics.