期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 60, 期 30, 页码 16343-16348出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202103361
关键词
fluorescence; quantum dots; WLEDs
资金
- National Natural Science Foundation of China [NSFC 21573019, 21872010]
- Fundamental Research Funds for the Central Universities [2020NTST11]
This study presents a gram-scale synthesis of red/green/blue solid-state fluorescent carbon quantum rings with high quantum yields, offering a potential alternative to REE-free phosphor-converted white LEDs. These R/G/B-SBF-CQRs-based LEDs emit warm white light with low CCT, high CRI, and high luminous efficiency, comparable to REE-phosphor-based LEDs.
The negative impact of rare-earth elements (REEs) on the environment, limited supply and high cost prompt the need for REE-free phosphor-converted white light-emitting diodes (LEDs). Here, we report the gram-scale synthesis of red/green/blue solid-state bandgap fluorescent carbon quantum rings (R/G/B-SBF-CQRs) with high quantum yields up to 30-46 %. This was achieved using cyano-group-bearing p-phenyldiacetonitrile as precursor and forming carbon quantum rings of different diameters through the linkage of curved carbon quantum ribbons of different lengths. The results show the role of cyano groups in inducing the curvature of the carbon quantum ribbons for CQR formation and emission of stable solid-state bandgap fluorescence. R/G/B-SBF-CQRs-phosphor-based LEDs emitted warm white light with low CCT (3576 K), high CRI (96.6), and high luminous efficiency (48.7 lm W-1), comparable to REE-phosphor-based LEDs.
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