Controlling the fluorescence and room-temperature phosphorescence behaviour of carbon nanodots with inorganic crystalline nanocomposites

Other reports describing inorganic and hydrogen bonding-rich hosts for Carbon dots may describe longer lifetimes and higher quantum yields22,31, our method provides a systematic and easy approach to controlling PL properties through the selection of both the cation and anion, and the functionality of the carbon nanodots, yielding specific fluorescence and phosphorescence colours and lifetimes

David C. Green; Mark A. Holden; Mark A. Levenstein; Shuheng Zhang; Benjamin R. G. Johnson; Julia Gala de Pablo; Andrew Ward; Stanley W. Botchway; Fiona C. Meldrum

2019

Scholarcy highlights

  • There is a significant drive to identify alternative materials that exhibit room temperature phosphorescence for technologies including bio-imaging, photodynamic therapy and organic light-emitting diodes
  • A sodium folate solution was heated at 200 °C for 12 h in an autoclave, and subsequent filtration of the resulting orange F-carbon nanodots solution removed any large aggregates
  • Characterisation of the Folic acidderived CNDs using Fourier transform infrared and Raman spectroscopy confirmed the presence of N-heterocycle motifs, which are retained from the folic acid precursor
  • Our synthetic strategy provides a simple method for preparing water-stable, biocompatible afterglow nanoparticles, whose surfaces can be readily modified. These experiments show that PL behaviour in Room temperature phosphorescence F-CND/host nanocomposites can be tuned through judicious selection of the inorganic host
  • Values for τF1 for F-CND aqueous solution and dried F-CND are given on c and d phosphorescence quantum yields, lifetimes and relative intensities are related to host cation Z
  • The condensed host phase forces cations close to the F-CND surface, and heavier atoms interfere with electronic transitions, intersystem crossing within the photoactive carbonyl and N-heterocycles F-CND surface groups
  • Quantum yields of F-carbon nanodots/host nanocomposite solids were estimated by comparing their luminescence intensity with fluorescein/CaCO3 mixtures

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