期刊
ACS APPLIED MATERIALS & INTERFACES
卷 13, 期 36, 页码 43241-43246出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c11029
关键词
carbon dots; phosphorescence; triplet state; intersystem crossing; coordination
资金
- Natural Science Foundation of Anhui Province [1908085MB41]
- Natural Science Foundation of Anhui Province for Distinguished Young Scholars [2008085J11]
- Natural Science Foundation of Education Department of Anhui Province [KJ2019A0011]
- Innovative Training Program for College Students [202010360038]
By introducing nitrogen heterocycles and coordinating with metal ions, room-temperature phosphorescent carbon dots have been successfully developed for applications in information encryption and anti-counterfeiting.
Room-temperature phosphorescent carbon dots (RTP-CDs) may be used in anti-counterfeiting, information encryption, and optoelectronic devices, but modulating their triplet-state energy is still challenging. Here, a type of RTP-CDs was developed via hydrothermal polymerization-carbonization of azamacrocycle and poly(acrylic acid). The introduction of nitrogen heterocycle promotes the intersystem crossing from the singlet state to the triplet state, and the functional groups of CDs can form interdot hydrogen bonds to protect the triplet state. In addition, the uncarbonized heterocycle groups in the CDs provide coordination sites for metal ions. In this case, the excited triplet-state energy of CDs is quenched by paramagnetic ions (Co2+ and Cu2+) or transfers to luminescent ions (Tb3+ and Eu3+). Furthermore, the modulation of the triplet state by metal ion binding was demonstrated in information encryption and anticounterfeiting applications.
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