Fluorescence Quenching Effects of Carbon Shells on Eu₂O₃ Nanoparticles

Area of Science:

• Materials Science
• Nanotechnology
• Photochemistry

Background:

• Fluorescent nanoparticle performance is critically impacted by quenching materials, often introduced as impurities.
• Understanding and mitigating fluorescence quenching is essential for developing high-performance nanomaterials.

Purpose of the Study:

• To investigate the fluorescence quenching effects of carbon shells on europium oxide (Eu2O3) nanoparticles.
• To quantify the impact of varying carbon contamination levels on photoluminescence (PL) and absolute quantum yields (QYs).

Main Methods:

• Synthesis of bare and carbon-grafted Eu2O3 nanoparticles using dextrose as a carbon source.
• Characterization of synthesized nanoparticles via photoluminescence (PL) spectra measurements.
• Determination of absolute quantum yields (QYs) for nanoparticles with different carbon shell thicknesses.
• Grafting of Eu2O3@C nanoparticles with 2,6-pyridinedicarboxylic acid (PDA) to assess potential QY enhancement.

Main Results:

• Increasing amounts of grafted carbon on Eu2O3 nanoparticles led to a noticeable decrease in PL intensity.
• Higher carbon shell concentrations resulted in a significant reduction in absolute quantum yields (QYs).
• The presence of carbon layers acts as an effective fluorescence quencher for Eu2O3 nanoparticles.

Conclusions:

• Carbon contamination during the synthesis of fluorescent nanoparticles has a detrimental effect on their optical properties.
• To achieve high quantum yields and optimal performance, it is crucial to avoid carbon impurities in fluorescent nanoparticle production.
• These findings provide critical insights for the controlled synthesis of high-quality luminescent nanomaterials.