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Highly Efficient Aggregation-Induced Red-Emissive Organic Thermally Activated Delayed Fluorescence Materials with Prolonged Fluorescence Lifetime for Time-Resolved Luminescence Bioimaging
- Highly Efficient Aggregation-Induced Red-Emissive Organic Thermally Activated Delayed Fluorescence Materials with Prolonged Fluorescence Lifetime for Time-Resolved Luminescence Bioimaging
- Qi, Sujie; Kim, Sangin; Nguyen, Van-Nghia; Kim, Youngmee; Niu, Guangle; Kim, Gyoungmi; Kim, Sung-Jin; Park, Sungnam; Yoon, Juyoung
- Ewha Authors
- 김성진; 김영미; 윤주영
- SCOPUS Author ID
- 김성진; 김영미; 윤주영
- Issue Date
- Journal Title
- ACS APPLIED MATERIALS & INTERFACES
- ACS APPLIED MATERIALS & INTERFACES vol. 12, no. 46, pp. 51293 - 51301
- thermally activated delayed fluorescence (TADF); aggregation-induced emission; red emission; fluorescence imaging; time-resolved luminescence imaging
- AMER CHEMICAL SOC
- SCIE; SCOPUS
- Document Type
- Organic thermally activated delayed fluorescence (TADF) materials are emerging as potential candidates for time-resolved fluorescence imaging in biological systems. However, the development of purely organic TADF materials with bright aggregated-state emissions in the red/near-infrared (NIR) region remains challenging. Here, we report three donor-acceptor-type TADF molecules as promising candidates for time-resolved fluorescence imaging, which are engineered by direct connection of electron-donating moieties (phenoxazine or phenothiazine) and an electron-acceptor 1,8-naphthalimide (NI). Theoretically and experimentally, we elucidate that three TADF materials possessed remarkably small Delta E-ST to promote the occurrence of reverse intersystem crossing (RISC). Moreover, they all exhibit aggregation-induced red emissions and long delayed fluorescence lifetimes without the influence of molecular oxygen. More importantly, these long-lived and biocompatible TADF materials, especially the phenoxazine-substituted NI fluorophores, show great potential for high-contrast fluorescence lifetime imaging in living cells. This study provides further a molecular design strategy for purely organic TADF materials and expands the versatile biological application of long-lived fluorescence research in time-resolved luminescence imaging.
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