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Synthesis of Core-shell Lanthanide-doped Upconversion Nanocrystals for Cellular Applications

Synthesis of Core-shell Lanthanide-doped Upconversion Nanocrystals for Cellular Applications

Published on: November 10, 2017

Up-converting nanoparticles synthesis using hydroxyl-carboxyl chelating agents: Fluoride source effect.

Ivana Dinic¹, Marina Vukovic¹, Marko Nikolic²

¹Innovative Centre Faculty of Chemistry Belgrade, University of Belgrade, Belgrade, Serbia.

The Journal of Chemical Physics

|September 3, 2020

Summary

This summary is machine-generated.

This study synthesizes hydrophilic lanthanide-doped up-converting nanoparticles (UCNPs) using citrate-based chelating agents. The resulting UCNPs exhibit intense green luminescence, suitable for various advanced applications.

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Area of Science:

Materials Science
Nanotechnology
Luminescence

Background:

Lanthanide-doped up-converting nanoparticles (UCNPs) are crucial for applications in optoelectronics, forensics, security, and biomedicine.
Conventional UCNP synthesis often involves organometallic decomposition and post-synthesis surface modification.

Purpose of the Study:

To develop a one-step solvothermal synthesis of hydrophilic NaY0.5Gd0.3F4:Yb,Er UCNPs.
To investigate the role of hydroxyl-carboxyl chelating agents (citric acid, sodium citrate) and fluoride sources on UCNP properties.

Main Methods:

Solvothermal synthesis of NaY0.5Gd0.3F4:Yb,Er UCNPs using rare earth nitrate salts, citrate-based chelating agents, and various fluoride sources (NaF, NH4F, NH4HF2).
Characterization using X-ray powder diffraction (XRD) to determine crystal phases and particle sizes.
Photoluminescence spectroscopy to analyze up-conversion emission properties.

Main Results:

Successfully synthesized hydrophilic NaY0.5Gd0.3F4:Yb,Er UCNPs with both cubic and hexagonal crystal phases.
Sodium citrate favored the hexagonal phase, while the fluoride source influenced particle size and morphology.
Synthesized UCNPs functionalized with citrate ligands emitted intense green light (519 nm and 539 nm) under near-infrared excitation.

Conclusions:

Citrate-based in-situ solvothermal synthesis is an effective method for producing hydrophilic lanthanide-doped up-converting nanoparticles.
The choice of chelating agent and fluoride source allows tuning of UCNP crystal structure, morphology, and luminescence properties.
These citrate-functionalized UCNPs show promise for diverse applications requiring efficient up-conversion luminescence.