Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 60, Issue 22, Pages 12585-12590Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202103086
Keywords
carbon dots; electroluminescence; machine learning; photoluminescence; white-light-emitting diodes
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Funding
- National MCF Energy R&D Program of China [2018YFE0306105]
- National Key R&D Program of China [2020YFA0406101, 2020YFA0406104, 2017YFB0701600, 2017YFA0204800]
- Innovative Research Group Project of the National Natural Science Foundation of China [51821002]
- National Natural Science Foundation of China [51725204, 21771132, 51972216, 52041202]
- Natural Science Foundation of Jiangsu Province [BK20190041]
- Key-Area Research and Development Program of GuangDong Province [2019B010933001]
- Collaborative Innovation Center of Suzhou Nano Science Technology
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- 111 Project
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In this study, carbon dots (CDs) with green and orange emissions were fabricated and used for LED fabrication. Machine learning was utilized to predict and control the correlated color temperature of the white light emission, resulting in warm white and cold white LEDs.
Here, we show the fabrication of the carbon dots (CDs) with green and orange emissions from PTCDA (perylene-3,4,9,10-tetracarboxylic dianhydride). Using these CDs as emitters, the orange (or green) CDs LEDs were fabricated, which show electroluminescence (EL) spectra centered at 560 nm (or 498 nm) with an external quantum efficiency (EQE) of 1.98 % (1.76 %) adhering a luminescence of 626 cd m(-2) (or 519 cd m(-2)). The machine learning was successfully used to predict PL CCT value. With the model, the white photoluminescence (PL) emission with adjustable correlated color temperature (CCT) from 3093 to 11018 K via combining blue, green, and orange CDs was achieved. Then, we obtained the warm white CDs LEDs with CCT of 3107, 4071 and 4548 K, and cold white CDs LEDs with CCT of 5632 (CIE coordinates of (0.33, 0.33), EQE: 1.18 %, luminescence: 598 cd m(-2)) and 6034 K accurately.
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