Journal
JOURNAL OF MATERIALS CHEMISTRY C
Volume 4, Issue 38, Pages 9027-9035Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6tc02853e
Keywords
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Funding
- Natural Science Foundation of Zhejiang Province for Distinguished Young Scholars [LR15E020001]
- National Natural Science Foundation of China [21271170, 51372172, 61372025, 51572065]
- 151 talent's projects in the second level of Zhejiang Province
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Currently, the excitation-wavelength-dependent photoluminescence of traditional carbon dots does not constitute true tuning and their absorptions show gradual attenuation in the visible region. Herein, we report a facile strategy to realize intense visible absorption and full-color emissions of nitrogen doped carbon dots via the control of surface nitriding. The quantum yields of the carbon dots in aqueous solution reached 49.2%, 30.6% and 30.3% for blue, yellow and red emissions, respectively. Structural characterizations and spectroscopic analyses verify that three diverse emitting states, i.e., sp(2) carbon core, C = O and C = N related surface defects, are responsible for the multi-state absorptions and tunable emissions of the carbon dots. The ability to truly tune luminescence into the red wavelength region with strong visible absorption enables these carbon dots to improve the correlated color temperature and color rendering index of traditional phosphor-converted white light-emitting diodes.
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