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

The synthesis of lanthanide doped up-converting nanoparticles (UCNPs), whose morphological, structural, and luminescence properties are well suited for applications in optoelectronics, forensics, security, or biomedicine, is of tremendous significance. The most commonly used synthesis method compris...

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Bibliographic Details
Published in:The Journal of chemical physics 2020-08, Vol.153 (8), p.084706-084706
Main Authors: Dinic, Ivana, Vukovic, Marina, Nikolic, Marko, Tan, Zhenquan, Milosevic, Olivera, Mancic, Lidija
Format: Article
Language:English
Subjects:
Biocompatibility
Chelating agents
Chelation
Citric acid
Conversion
Crystallization
Erbium
Fluorides
Hexagonal phase
Infrared radiation
Luminescence
Luminous intensity
Nanoparticles
Optical properties
Optoelectronics
Organometallic compounds
Photons
Physics
Sodium
Sodium citrate
Synthesis
X ray powder diffraction
Ytterbium
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Summary:The synthesis of lanthanide doped up-converting nanoparticles (UCNPs), whose morphological, structural, and luminescence properties are well suited for applications in optoelectronics, forensics, security, or biomedicine, is of tremendous significance. The most commonly used synthesis method comprises decomposition of organometallic compounds in an oxygen-free environment and subsequent infliction of a biocompatible layer on the particle surface. In this work, hydroxyl–carboxyl (—OH/—COOH) type of chelating agents (citric acid and sodium citrate) are used in situ for the solvothermal synthesis of hydrophilic NaY0.5Gd0.3F4:Yb,Er UCNPs from rare earth nitrate salts and different fluoride sources (NaF, NH4F, and NH4HF2). X-ray powder diffraction showed crystallization of cubic and hexagonal NaY0.5Gd0.3F4:Yb,Er phases in nano- and micro-sized particles, respectively. The content of the hexagonal phase prevails in the samples obtained when Na-citrate is used, while the size and shape of the synthesized mesocrystals are affected by the choice of fluoride source used for precipitation. All particles are functionalized with citrate ligands and emit intense green light at 519 nm and 539 nm (2H11/2, 4S3/2 → 4I15/2) under near infrared light. The intensity of this emission is distressed by the change in the origin of phonon energy of the host matrix revealed by the change in the number of the excitation photons absorbed per emitted photon.
ISSN:0021-9606
1089-7690
DOI:10.1063/5.0016559