Journal
CHEMICAL SCIENCE
Volume 9, Issue 10, Pages 2705-2710Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7sc04820c
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Funding
- National Science Foundation of China [21788102, 81501591, 81701744]
- National Basic Research Program of China (973 Program) [2013CB834701, 2013CB834702]
- Science and Technology Plan of Shenzhen [JCYJ20160229205601482]
- Research Grants Council of Hong Kong [16308016, 16305015, C2014-15G, A-HKUST605/16, N_HKUST604/14]
- Innovation and Technology Commission [ITC-CNERC14SC01, ITCPD/17-9]
- Major State Basic Research Development Program of China (973 Program) [2015CB755500]
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Reported here is a successful strategy for the design of ultrabright red luminogens with aggregationinduced emission (AIE) features, donor-acceptor structures, and intense charge transfer effects. These luminogens show no aggregation caused emission quenching in the solid state and have high quantum efficiency. They can be fabricated into AIE dots by a simple nanoprecipitation procedure. The AIE dots exhibit high brightness, a large Stokes shift, good biocompatibility, satisfactory photostability, and a high two-photon absorption cross section. The AIE dots can be utilized as highly efficient fluorescent probes for in vivo deep-tissue imaging by a two-photon technique, which outperforms the one-photon technique under the same experimental conditions, in terms of penetration depth and image contrast. This is the first report of using highly emissive AIE dots for the accurate measurement of capillary diameters in mouse ears. Such a strategy sheds light on the development of efficient solid state red/NIR emitters for biological applications.
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