In:
Chemistry – An Asian Journal, Wiley, Vol. 16, No. 24 ( 2021-12-13), p. 4155-4164
Kurzfassung:
Fluorescent carbon nanodots (CDs) have been highlighted as promising semiconducting materials due to their outstanding chemical and optical properties. However, the intrinsic heterogeneity of CDs has impeded a clear understanding of the mechanisms behind their photophysical properties. In this study, as‐prepared CDs are fractionated via chromatography to reduce their structural and chemical heterogeneity and analyzed through ensemble and single‐particle spectroscopies. Many single particles reveal fluorescence intensity fluctuations between two or more discrete levels with bi‐exponential decays. While the intrinsic τ 1 components are uniform among single particles, the τ 2 components from molecule‐like emissions spans a wider range of lifetimes, reflecting the inhomogeneity of the surface states. Furthermore, it is concluded that the relative population and chemical states of surface functional groups in CDs have a significant impact on emissive states, brightness, blinking, stability, and lifetime distribution of photoluminescence.
Materialart:
Online-Ressource
ISSN:
1861-4728
,
1861-471X
DOI:
10.1002/asia.202101087
Sprache:
Englisch
Verlag:
Wiley
Publikationsdatum:
2021
ZDB Id:
2233006-9