Journal
CHEMICAL SCIENCE
Volume 13, Issue 15, Pages 4406-4412Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d2sc01167k
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Funding
- National Natural Science Foundation of China [21975120, 21875104]
- Open Research Fund Program of Collaborative Innovation Center for Molecular Imaging of Precision Medicine [2020-ZD01, 2020-MS03]
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A new type of full-color-tunable ultralong phosphorescence carbon dots without matrix-assistance have been reported, which have potential applications in information encryption, light detection, and LED devices.
Color-tunable ultralong phosphorescence is urgently desired in optoelectronic applications. Herein, we report a new type of full-color-tunable ultralong phosphorescence carbon dots (CDs) without matrix-assistance by a self-doping method under ambient conditions. The phosphorescence color can be rationally tuned from blue to red by changing the excitation wavelength from 310 to 440 nm. The CDs exhibit an ultralong lifetime of up to 1052.23 ms at 484 nm. From the experimental data, we speculate that the excitation-dependent multi-color phosphorescence is attributed to the presence of multiple emitting centers related to carbonyl units. Given the unique color-tunability of CDs, we demonstrate their potential applications in information encryption, light detection ranging from UV to visible light and LED devices. This finding not only takes a step towards the fundamental design of full-color emissive materials, but also provides a broader scope for the applications of phosphorescent materials.
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