Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 12, Issue 37, Pages 8939-8946Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.1c02475
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Funding
- National Natural Science Foundation of China [21771172]
- Research Equipment Development Project of the Chinese Academy of Sciences [YJKYYQZ20200005]
- Youth Innovation Promotion Association, CAS [2013150]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB20000000]
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A simple strategy for developing full-color carbon quantum dots (CQDs) was proposed, resulting in the synthesis of blue, green, yellow-green, and orange-red CQDs doped with heteroatoms. The study also explored how luminescence can be tuned and improved in CQDs. Furthermore, a high-efficiency white light-emitting diode was successfully fabricated with high color rendering index.
Proposing a simple strategy for developing full-color carbon quantum dots (CQDs) and exploring how the luminescence can be tuned and improved is attractive and encouraging. Herein, blue, green, yellow-green, and orange-red CQDs doped with heteroatoms were synthesized in one pot and separated by column chromatography, with emission peaks of 435 nm, 495 nm [photoluminescence quantum yield (PLQY) of 88.9%], 525 nm, and 595 nm (full width at half-maximum of 31 nm), respectively. The abundant C-O/C-O-C electron donor groups greatly improve the PLQY of green CQDs, and the expended effective conjugated domains (particle size, doped chlorine, and conjugated nitrogen) of CQDs boost the red-shifts of emission spectra. Energy transfer (ET) in a concentrated mixed solution of CQDs was discovered, and possible ET mechanisms are proposed. Furthermore, a high-efficiency white lightemitting diode with Commission Internationale de L'Eclairage coordinates of (0.361, 0.369), a correlated color temperature of 4534 K, and a high color rendering index of 90.8 was fabricated.
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