Onion-like multicolor thermally activated delayed fluorescent carbon quantum dots for efficient electroluminescent light-emitting diodes

Yuxin Shi, Yang Zhang (), Zhibin Wang, Ting Yuan, Ting Meng, Yunchao Li, Xiaohong Li, Fanglong Yuan (), Zhan’ao Tan () and Louzhen Fan ()
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Yuxin Shi: Beijing Normal University
Yang Zhang: Beijing Normal University
Zhibin Wang: Fujian Normal University
Ting Yuan: Beijing Normal University
Ting Meng: Beijing Normal University
Yunchao Li: Beijing Normal University
Xiaohong Li: Beijing Normal University
Fanglong Yuan: Beijing Normal University
Zhan’ao Tan: Beijing University of Chemical Technology
Louzhen Fan: Beijing Normal University

Nature Communications, 2024, vol. 15, issue 1, 1-11

Abstract: Abstract Carbon quantum dots are emerging as promising nanomaterials for next-generation displays. The elaborate structural design is crucial for achieving thermally activated delayed fluorescence, particularly for improving external quantum efficiency of electroluminescent light-emitting diodes. Here, we report the synthesis of onion-like multicolor thermally activated delayed fluorescence carbon quantum dots with quantum yields of 42.3–61.0%. Structural, spectroscopic characterization and computational studies reveal that onion-like structures assembled from monomer carbon quantum dots of different sizes account for the decreased singlet-triplet energy gap, thereby achieving efficient multicolor thermally activated delayed fluorescence. The devices exhibit maximum luminances of 3785–7550 cd m−2 and maximum external quantum efficiency of 6.0–9.9%. Importantly, owing to the weak van der Waals interactions and adequate solution processability, flexible devices with a maximum luminance of 2554 cd m−2 are realized. These findings facilitate the development of high-performance carbon quantum dots-based electroluminescent light-emitting diodes that are promising for practical applications.

Date: 2024
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DOI: 10.1038/s41467-024-47372-8

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