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Carbon Nanodots With Nearly Unity Fluorescent Efficiency Realized via Localized Excitons

69 Pages Posted: 31 Aug 2021 Publication Status: Review Complete

See all articles by Qing Lou

Qing Lou

Zhengzhou University - Key Laboratory of Materials Physics, Ministry of Education

Chunyao Niu

Zhengzhou University - Key Laboratory of Materials Physics, Ministry of Education

Jianyong Wei

Zhengzhou University - Key Laboratory of Materials Physics, Ministry of Education

Zhuangfei Zhang

Zhengzhou University - Key Laboratory of Materials Physics, Ministry of Education

Weixia Shen

Zhengzhou University - Key Laboratory of Materials Physics, Ministry of Education

Chenglong Shen

Zhengzhou University - Key Laboratory of Materials Physics, Ministry of Education

Chaochao Qin

Henan Normal University - Henan Key Laboratory of Infrared Materials and Spectrum Measures and Applications

Guangsong Zheng

Zhengzhou University - Key Laboratory of Materials Physics, Ministry of Education

Kaikai Liu

Zhengzhou University - Key Laboratory of Materials Physics, Ministry of Education

Jinhao Zang

Zhengzhou University - Key Laboratory of Materials Physics, Ministry of Education

Lin Dong

Zhengzhou University - Key Laboratory of Materials Physics, Ministry of Education

Chong-Xin Shan

Zhengzhou University - Key Laboratory of Materials Physics, Ministry of Education

More...

Abstract

Carbon nanodots (CDs) have emerged as an alternative option for traditional nanocrystals due to their excellent optical properties and low toxicity. Nevertheless, high emission efficiency has been a long-lasting pursuit for CDs. Herein, CDs with near-unity emission efficiency have been prepared via atomic condensation of doped pyrrolic nitrogen, which can highly localize the excited states thus lead to the formation of bound excitons and the symmetry break of the π–electron conjugation. The short radiative lifetimes (< 8 ns) and diffusion lengths (< 50 nm) of the CDs imply excitons can be efficiently localized by radiative recombination centers for a defect-insensitive emission of CDs. By incorporating the CDs into polystyrene, flexible light-converting films with high solid state quantum efficiency of 84% and good resistance to water, heating, and UV light have been obtained. With the CD-polymer films as light conversion layer, CD based white light-emitting diodes (WLEDs) with a luminous efficiency of 140 lm W–1 and flat panel illumination system with lighting sizes of more than 100 cm2 have been achieved, matching state-of-the-art nanocrystal-based LEDs. These results pave the way towards carbon-based luminescent materials for solid state lighting technology.

Keywords: Carbon nanodot, Localized exciton, Symmetry breaking, Light-emitting diode

Suggested Citation

Lou, Qing and Niu, Chunyao and Wei, Jianyong and Zhang, Zhuangfei and Shen, Weixia and Shen, Chenglong and Qin, Chaochao and Zheng, Guangsong and Liu, Kaikai and Zang, Jinhao and Dong, Lin and Shan, Chong-Xin, Carbon Nanodots With Nearly Unity Fluorescent Efficiency Realized via Localized Excitons. Available at SSRN: https://ssrn.com/abstract=3915001 or http://dx.doi.org/10.2139/ssrn.3915001
This version of the paper has not been formally peer reviewed.

Qing Lou

Zhengzhou University - Key Laboratory of Materials Physics, Ministry of Education

100 Science Avenue
Zhengzhou, CO Henan 450001
China

Chunyao Niu

Zhengzhou University - Key Laboratory of Materials Physics, Ministry of Education

100 Science Avenue
Zhengzhou, CO 450001
China

Jianyong Wei

Zhengzhou University - Key Laboratory of Materials Physics, Ministry of Education ( email )

Zhengzhou
China

Zhuangfei Zhang

Zhengzhou University - Key Laboratory of Materials Physics, Ministry of Education

100 Science Avenue
Zhengzhou, CO 450001
China

Weixia Shen

Zhengzhou University - Key Laboratory of Materials Physics, Ministry of Education

100 Science Avenue
Zhengzhou, CO 450001
China

Chenglong Shen

Zhengzhou University - Key Laboratory of Materials Physics, Ministry of Education

100 Science Avenue
Zhengzhou, CO 450001
China

Chaochao Qin

Henan Normal University - Henan Key Laboratory of Infrared Materials and Spectrum Measures and Applications

Henan
China

Guangsong Zheng

Zhengzhou University - Key Laboratory of Materials Physics, Ministry of Education

100 Science Avenue
Zhengzhou, CO 450001
China

Kaikai Liu

Zhengzhou University - Key Laboratory of Materials Physics, Ministry of Education

100 Science Avenue
Zhengzhou, CO 450001
China

Jinhao Zang

Zhengzhou University - Key Laboratory of Materials Physics, Ministry of Education

100 Science Avenue
Zhengzhou, CO 450001
China

Lin Dong

Zhengzhou University - Key Laboratory of Materials Physics, Ministry of Education ( email )

Zhengzhou
China

Chong-Xin Shan (Contact Author)

Zhengzhou University - Key Laboratory of Materials Physics, Ministry of Education ( email )

Zhengzhou
China

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