Citation: Yuan Liu, Boyang Wang, Yaxin Li, Weidong Li, Siyu Lu. Understanding excitonic behavior and electroluminescence light emitting diode application of carbon dots[J]. Chinese Chemical Letters, ;2025, 36(2): 110426. doi: 10.1016/j.cclet.2024.110426 shu

Understanding excitonic behavior and electroluminescence light emitting diode application of carbon dots

Yuan Liu ^a ,
Boyang Wang ^b ,
Yaxin Li ^a ,
Weidong Li ^{c, *,} ,
Siyu Lu ^{b, *,}

a.
School of Chemistry and Chemical Engineering, Henan University of Technology, Zhengzhou 450001, China
b.
College of Chemistry, Zhengzhou University, Zhengzhou 450001, China
c.
College of Material Engineering, Henan International Joint Laboratory of Rare Earth Composite Materials, Henan University of Engineering, Zhengzhou 451191, China

liweidong@haue.edu.cn

sylu2013@zzu.edu.cn

Received Date: 11 June 2024
Revised Date: 3 September 2024
Accepted Date: 6 September 2024
Available Online: 7 September 2024

Figures(4)

Carbon dots (CDs), due to their low cost, high stability, and high luminous efficiency, have emerged as an excellent material for the emissive layer in next-generation electroluminescent light-emitting diodes (ELEDs). However, improving the efficiency of fluorescent CDs-based ELEDs remains challenging, primarily because it is difficult to utilize triplet excitons in the electroluminescence process. Therefore, enhancing the exciton utilization efficiency of CDs during electroluminescence is crucial. Based on this, we exploited the characteristic large exciton binding energy commonly found in CDs to develop exciton-emitting CDs. These CDs facilitate the radiative recombination of excitons during electroluminescence, thereby improving the electroluminescent efficiency. By rationally selecting precursors, we developed high quantum efficiency CDs and subsequently constructed CDs-based ELEDs. The blue-light device exhibited an external quantum efficiency of over 4%. This study introduces a novel design concept for CDs, providing a new strategy for developing high-performance blue ELEDs based on CDs.
- Carbon dots,
- Electroluminescence,
- Controllable preparation,
- Exciton emission,
- Light-emitting diodes
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