Afterglow Carbon Dots: From Fundamentals to Applications

We describe a toolbox for activating the afterglow luminescence of carbon dots with an emphasis on the methods with the ability to tune their afterglow lifetime and color output

Chenxi Peng; Xue Chen; Meiling Chen; Shenci Lu; Yu Wang; Suli Wu; Xiaowang Liu; Wei Huang

2021

Scholarcy highlights

  • Afterglow is an interesting optical phenomenon in which a substance releases accumulated energy in the form of photons after removal of the excitation source
  • This review has summarized the recent advances in the field of afterglow carbon dots ranging from physical fundamentals, afterglow activation strategy, and emergent afterglow luminescence properties to multiple applications
  • Owing to their intriguing optical properties and widespread potential applications, afterglow CDs should continue to be a focus of a growing body of research in materials science and optoelectronics
  • Cross-linked polymer chains immobilized on the surface of CDs that seem to be essential to the afterglow luminescence of CDs are invisible in conventional TEM inspection
  • Two encouraging reports suggest that enhancing synthetic temperatures may be applicable to the synthesis of CDs with red afterglow luminescence via exquisite control of their surface oxidation states
  • In 2019, Jiang and coworkers first reported the aggregation-induced yellow room temperature phosphorescence from CDs which were prepared via the hydrothermal treatment of trimellitic acid at 260°C for 12 h. In their study, they have reported that blue fluorescence was only observed from a THF dispersion of the CDs, whereas yellow RTP appeared when the water content in the mixture was higher than 80%)
  • Utilization of preformed mesoporous SiO2 nanoparticles to load with CDs followed by growth of a protective SiO2 shell may provide a much-needed solution to address this challenge(v)Exploring efficient synthetic and purification strategies for afterglow CDs
  • These results suggest the success of creating three primary long-lived red, green, and blue emissions under excitation at a single excitation wavelength, allowing the feasibility of fine-tuning the afterglow color output of the covert pattern via the use of a mixture of the afterglow carbon dots. Notably, the development of stimulus-responsive afterglow CDs is attractive for anticounterfeiting due to their improved capability in data encoding

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