@article{7e7247c4e8ee4632b1cf1e1510d50c82,
title = "Non-Blinking Luminescence from Charged Single Graphene Quantum Dots",
abstract = "Photoluminescence blinking behavior from single quantum dots under steady illumination is an important but controversial topic. Its occurrence has impeded the use of single quantum dots in bioimaging. Different mechanisms have been proposed to account for it, although controversial, the most important of which is the non-radiative Auger recombination mechanism whereby photocharging of quantum dots can lead to the blinking phenomenon. Here, the singly charged trion, which maintains photon emission, including radiative recombination and non-radiative Auger recombination, leads to fluorescence non-blinking which is observed in photocharged single graphene quantum dots (GQDs). This phenomenon can be explained in terms of different energy levels in the GQDs, caused by various oxygen-containing functional groups in the single GQDs. The suppressed blinking is due to the filling of trap sites owing to a Coulomb blockade. These results provide a profound understanding of the special optical properties of GQDs, affording a reference for further in-depth research.",
keywords = "Auger recombination, charged trions, graphene quantum dots, non-blinking, single quantum dots",
author = "Wei Fu and Jiefu Yin and Huaqiang Cao and Zhongfu Zhou and Junying Zhang and Jingjing Fu and Warner, {Jamie H.} and Cheng Wang and Xiaofang Jia and Greaves, {G. Neville} and Cheetham, {Anthony K.}",
note = "Funding Information: W.F. and J.Y. contributed equally to this work. The authors thank Prof. Yen Wei and Prof. Huizhong Kou at Tsinghua University for helping to measure fluorescence, UV–vis absorption spectra, and Fourier transform infrared spectra, Prof. Xiaoyong Wang at Nanjing University, School of Physics for helping to measure the second‐order photon correlation functions g() measurement and PL intensity time traces, Associate Prof. Zhuan Wang at Institute of Physics, CAS for carrying TA measurement. The authors also thank Prof. Xinfeng Liu at National Center for Nanoscience and Technology for the discussion about TA. This work was funded by financial support from the National Natural Science Foundation of China (22171158), the Engineering Research Center of Advanced Rare Earth Materials, (Ministry of Education, China), Department of Chemistry, Tsinghua University (Beijing 100084, China), the Tribology Science Fund of State Key Laboratory of Tribology (SKL TKF20B18), the National Key R&D Program of China (2016YFA0200200), and the National Program on Key Basic Research Project (973 program, 2013CB933804). A.K.C. thanks the Ras Al Khaimah, Centre for Advanced Materials for finanical support. (2) τ Funding Information: W.F. and J.Y. contributed equally to this work. The authors thank Prof. Yen Wei and Prof. Huizhong Kou at Tsinghua University for helping to measure fluorescence, UV–vis absorption spectra, and Fourier transform infrared spectra, Prof. Xiaoyong Wang at Nanjing University, School of Physics for helping to measure the second-order photon correlation functions g(2)(τ) measurement and PL intensity time traces, Associate Prof. Zhuan Wang at Institute of Physics, CAS for carrying TA measurement. The authors also thank Prof. Xinfeng Liu at National Center for Nanoscience and Technology for the discussion about TA. This work was funded by financial support from the National Natural Science Foundation of China (22171158), the Engineering Research Center of Advanced Rare Earth Materials, (Ministry of Education, China), Department of Chemistry, Tsinghua University (Beijing 100084, China), the Tribology Science Fund of State Key Laboratory of Tribology (SKL TKF20B18), the National Key R&D Program of China (2016YFA0200200), and the National Program on Key Basic Research Project (973 program, 2013CB933804). A.K.C. thanks the Ras Al Khaimah, Centre for Advanced Materials for finanical support. Note: Reference 4 was corrected on October 5, 2023, after initial publication online. Publisher Copyright: {\textcopyright} 2023 Wiley-VCH GmbH.",
year = "2023",
month = oct,
day = "5",
doi = "10.1002/adma.202304074",
language = "English",
volume = "35",
journal = "Advanced Materials",
issn = "0935-9648",
publisher = "Wiley",
number = "40",
}