Polyol-mediated C-dot formation showing efficient Tb³⁺/Eu³⁺ emission

Abstract

C-dots (3-5 nm in diameter) obtained by most simple heating of polyols (glycerol, diethylene glycol and PEG 400) show intense blue and green emission (50% quantum yield). Upon modification with TbCl3/EuCl3, energy transfer from the C-dots to the rare-earth metal results in line-type Tb(3+) (green)/Eu(3+) (red) emission with quantum yields up to 85%.

Microwave-Assisted Polyol Synthesis of Water Dispersible Red-Emitting Eu3+-Modified Carbon Dots

“…Recently, we could present lanthanide-modified C-dots and their PL for the first time [13,14]. Thus, Eu 3+ - and Tb 3+ -modified C-dots were prepared via the polyol method [15] by in situ thermal decomposition of the solvent (e.g., polyethylene glycol 400/PEG400) and showed excellent quantum yields for line-type red (75%) and green (85%) emission [13].…”

Cyto-toxicity, biocompatibility and cellular response of carbon dots–plasmonic based nano-hybrids for bioimaging

“…Moreover, the bonding between the carbon layers is limited to weak van der Waals interactions; the shi of XRD patterns is most obvious for (hkl) indices of the (001) type. 74 Liang and co-workers reported that the weakness in the reection intensity, and larger in inter-planer spacing than that of graphite (3.36Å) is attributed to the existence of more functional groups. This indicates increasing in the amorphous nature attributed to the introduction of more oxygen containing groups.…”

“…2(b) display a weak broad reection at position of around 2q 22.59 , suggesting the latticespacing distance (d hkl ) of 3.93Å, which reveals to (002) crystallographic reection of the hexagonal bulk-graphite. 23,25,60,73,74 The reason for the low intensity and broadness for XRD patterns of the as-prepared C-dots, in addition their shi to lower 2q angle about $22.59 compared to bulk-graphite around 26.543 are attributable to the small crystallite size as well as resulting stress and strain effects. Moreover, the bonding between the carbon layers is limited to weak van der Waals interactions; the shi of XRD patterns is most obvious for (hkl) indices of the (001) type.…”

“…This indicates increasing in the amorphous nature attributed to the introduction of more oxygen containing groups. 23,60,73,74 2.2. Inuence of plasmonic coupling on the PLE properties of carbon dots (C-dots)…”

Carbon Dots with Tunable Photoluminescence Properties

“…[26,27] For synthesizing the carbon dots used for the glucose biosensor, a typical process is as following: in a 20 mL vial, 100 mmol ethylene glycol, 0.5 mmol L-histidine and 0.5 mmol citric acid were added and mixed well. Then the vial was put in a home microwave oven and heated for 20 minutes.…”