Solvatochromism Unravels the Emission Mechanism of Carbon Nanodots

Marco Cannas, Fabrizio Messina, Alice Sciortino, Alice Sciortino, Emanuele Marino, Bart Van Dam, Peter Schall

Risultato della ricerca: Articlepeer review

104 Citazioni (Scopus)

Abstract

High quantum yield, photoluminescence tunability, and sensitivity to theenvironment are hallmarks that make carbon nanodots interesting for fundamental research andapplications. Yet, the underlying electronic transitions behind their bright photoluminescenceare strongly debated. Despite carbon-dot interactions with their environment should providevaluable insight into the emitting transitions, they have hardly been studied. Here, we investigatethese interactions in a wide range of solvents to elucidate the nature of the electronic transitions.We find remarkable and systematic dependence of the emission energy and kinetics on thecharacteristics of the solvent, with strong response of the photoexcited dots to hydrogenbonding. These findings suggest that the fluorescence originates from the radiativerecombination of a photoexcited electron migrated to surface groups with holes left in thevalence band of the crystalline core. Furthermore, the results demonstrate the fluorescencetunability to inherently derive from dot-to-dot polydispersity, independent of solventinteractions.
Lingua originaleEnglish
pagine (da-a)3419-3423
Numero di pagine5
RivistaTHE JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume7
Stato di pubblicazionePublished - 2016

All Science Journal Classification (ASJC) codes

  • ???subjectarea.asjc.2500.2500???
  • Physical and Theoretical Chemistry

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