One-step synthesis of orange-red emissive carbon dots: photophysical insight into their excitation wavelength-independent and dependent luminescence

A low-temperature method was developed to synthesize orange-red luminescence phosphor-doped carbon dots (CDs) without complicated purification procedures. These CDs showed excitation wavelength-independent narrow emission (photo-luminescence quantum yield, Φ f ∼ 12 to 22%) with single exponential ti...

Full description

Saved in:
Bibliographic Details
Published in:Physical chemistry chemical physics : PCCP 2024-06, Vol.26 (22), p.1639-16319
Main Authors: Prakash, Swayam, Patra, Bamadeb, Sahu, Saugata, Mishra, Ashok Kumar
Format: Article
Language:English
Subjects:
Carbon dots
Chromophores
Decay
Emission spectra
Excitation
Fluorescence
Illumination
Low temperature
Luminescence
Medical imaging
Phosphors
Photoluminescence
Polymer films
Polymethyl methacrylate
Solvents
Temperature dependence
Triethylamine
Citations: Items that this one cites
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:A low-temperature method was developed to synthesize orange-red luminescence phosphor-doped carbon dots (CDs) without complicated purification procedures. These CDs showed excitation wavelength-independent narrow emission (photo-luminescence quantum yield, Φ f ∼ 12 to 22%) with single exponential time-resolved decay in weakly polar/non-polar solvents, indicating the presence of one kind of chromophore. In contrast, the same CDs showed excitation wavelength-dependent broad emission ( Φ f ∼ 1 to 8%) with multi-exponential fluorescence decay in polar solvents. These CDs exhibited poor solubility in polar solvents, resulting in CD aggregates contributed by excitation wavelength-dependent weak luminescence. The CDs embedded in polymethyl methacrylate (PMMA) polymer film displayed bright orange-red fluorescence under UV 365 nm illumination, indicating their potential application in solid-state luminescence. Further, an analytical method was developed for the naked-eye detection of trifluoracetic acid (red emission) and triethylamine (green emission) under UV 365 nm illumination with reversible two switch-mode luminescence. Additionally, this efficient orange-red luminescence of CDs was utilized for possible bioimaging applications with negligible cytotoxicity in 3T3 mouse fibroblast cells. Photophysical insight into the excitation wavelength-independent and dependent luminescence of CDs in different solvent polarity and in solid state.
ISSN:1463-9076
1463-9084
DOI:10.1039/d4cp00919c