Ultralong lifetime and efficient room temperature phosphorescent carbon dots through multi-confinement structure design

Yuqiong Sun, Shuting Liu, Luyi Sun (), Shuangshuang Wu, Guangqi Hu, Xiaoliang Pang, Andrew T. Smith, Chaofan Hu, Songshan Zeng, Weixing Wang, Yingliang Liu () and Mingtao Zheng ()
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Yuqiong Sun: South China Agricultural University
Shuting Liu: University of Connecticut
Luyi Sun: University of Connecticut
Shuangshuang Wu: South China Agricultural University
Guangqi Hu: South China Agricultural University
Xiaoliang Pang: South China Agricultural University
Andrew T. Smith: University of Connecticut
Chaofan Hu: South China Agricultural University
Songshan Zeng: University of Connecticut
Weixing Wang: South China University of Technology
Yingliang Liu: South China Agricultural University
Mingtao Zheng: South China Agricultural University

Nature Communications, 2020, vol. 11, issue 1, 1-11

Abstract: Abstract Room temperature phosphorescence materials have inspired extensive attention owing to their great potential in optical applications. However, it is hard to achieve a room temperature phosphorescence material with simultaneous long lifetime and high phosphorescence quantum efficiency. Herein, multi-confined carbon dots were designed and fabricated, enabling room temperature phosphorescence material with simultaneous ultralong lifetime, high phosphorescence quantum efficiency, and excellent stability. The multi-confinement by a highly rigid network, stable covalent bonding, and 3D spatial restriction efficiently rigidified the triplet excited states of carbon dots from non-radiative deactivation. The as-designed multi-confined carbon dots exhibit ultralong lifetime of 5.72 s, phosphorescence quantum efficiency of 26.36%, and exceptional stability against strong oxidants, acids and bases, as well as polar solvents. This work provides design principles and a universal strategy to construct metal-free room temperature phosphorescence materials with ultralong lifetime, high phosphorescence quantum efficiency, and high stability for promising applications, especially under harsh conditions.

Date: 2020
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DOI: 10.1038/s41467-020-19422-4

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