Distinctive optical transitions of tunable multicolor carbon dots

Abstract

Three types of carbon dots (CDs) are synthesized from isomers of phenylenediamine to develop multicolor nanomaterials with low toxicity, high stability, and high quantum yield. The distinctive electronic structures of...

Fluorophore-Dependent Optical Properties of Multicolor Carbon Dots for Bioimaging and Optoelectronic Devices

“…The frontier orbitals and charge distributions of the QXPDAs are distinct due to the different positions of amino groups, leading to characteristic transition energies in the three types (Figure S3). Certainly, the calculated energies of QXPDAs (Figure 1e) are in good agreement with the measured energies (Figure 1c), 26,29 supporting the predominant role of molecular configurations. Notably, the measured energies of CDs are consistently higher than the calculated energies of QXPDAs, which suggests that an aggregated structure of QXPDAs would be the main chromophore in CDs.…”

“…The element composition ratios ([C]/[N]/[O]) are comparable in the three CDs with the dominant fraction of carbon (≥90%). 19,29 Carbon is primarily in the sp 2 -hybridized states (Figure 1b), nitrogen is in the pyridinic and amino states, and oxygen is in the carboxyl and hydroxyl groups. The intensity ratio of the D-band to the Gband of conjugated carbon systems is comparable in the Raman spectra of the three CDs (Figure S1).…”

Synthesis, optical properties and applications of red/near-infrared carbon dots

“…145 Compared to hydrothermal reaction 147,148 and solvothermal reaction, 103,107,120 the solid-state reaction and microwave-assisted reaction may present more advantages regarding the ease of synthesis and environmental-friendless during the large-scale C-dots production. 138,149,150 Fig. 2 (a) UV-vis absorption, PL excitation and emission spectra of the red C-dots synthesized using CA and urea as precursors and DMF as solvent.…”

“…145 Compared to the hydrothermal reaction 147,148 and solvothermal reaction, 103,107,120 the solid-state reaction and microwave-assisted reaction may present more advantages regarding the ease of synthesis and environmental friendless during the large-scale C-dot production. 138,149,150…”

Meter-scale chemiluminescent carbon nanodot films for temperature imaging

“…On the one hand, the OPD, as previously reported, has been demonstrated as a significant precursor and nitrogen dopant for producing CDs with high fluorescence quantum yields and excellent polychromatic emission capability. [31][32][33] On the other hand, OPD with a phenylene skeleton facilitates the formation and polymerization of long aromatic chains, endowing the prepared CDs with lipid-soluble properties and thus allowing them to be compatible with the peroxalate-hydrogen peroxide system, resulting in efficient CL. Nevertheless, using the CA only or some other combinations of CA and nitrogencontaining molecules like ethylenediamine and ethanolamine, most of the CD products are water-soluble and not suitable for the lipophilic peroxalate-based CL systems.…”