期刊
ADVANCED OPTICAL MATERIALS
卷 10, 期 12, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adom.202200099
关键词
aggregates; near-infrared; polymer site-isolates; room-temperature phosphorescence; visible-light excitable
资金
- National Natural Science Foundation of China [22103077, 21975238, 22003063]
- USTC startup fund [KY2340000139]
Organic room-temperature phosphorescent (RTP) materials play an important role in optical imaging and sensing technologies. However, the excitation requirements and potential photo damage limit their practical applications. In this study, a new design concept using dihydroxy-functionalized naphthalenediimide (NDI) is demonstrated to achieve visible light absorption and near-infrared RTP. The resulting polymer NDI-PLA2/NDI-PCL2 exhibits long lifetimes and offers potential for expanding to other molecular RTP systems.
Organic room-temperature phosphorescent (RTP) materials are useful in optical imaging and sensing technologies. However, most organic phosphors, including red-light emitting dyes, exhibit unusually large Stokes shifts, and require excitation with ultraviolet radiation, the high energy of which can induce substantial photo damage. Here a design concept of using dihydroxy-functionalized naphthalenediimide (NDI, lambda(abs) < 400 nm) is demonstrated to initiate ring-opening polymerizations of L-lactide (PLA) and epsilon-caprolactone (PCL), resulting in a linear polymer NDI-PLA2/NDI-PCL2. With the right combination of substituents, the design simultaneously realizes broadband visible light absorption (lambda(abs) = 450-650 nm) and near-infrared RTP (lambda(RTP) = 700 nm) with millisecond-long lifetimes. Polymer site isolations of the aggregation-prone NDI phosphors may prevent aggregation-caused quenching of RTP common in bulk, by forming various microscopic ground-state aggregates, which exhibit triplet-emitting states lower than that of the individual phosphor. The method can potentially be expanded onto other molecular RTP systems.
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