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Updated: Jun 20, 2026
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Synthesis of Core-shell Lanthanide-doped Upconversion Nanocrystals for Cellular Applications
Published on: November 10, 2017
Shape, size, and phase-controlled rare-Earth fluoride nanocrystals with optical up-conversion properties
Fan Zhang1, Jing Li, Jiong Shan
1Department of Chemistry, Fudan University, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials and Laboratory of Advanced Materials, Shanghai, PR China.
Chemistry (Weinheim an Der Bergstrasse, Germany)
|September 10, 2009
Summary
Researchers synthesized high-quality rare-earth fluoride nanocrystals and nanoarrays using a hydrothermal method. They precisely controlled synthesis conditions to tune phase, shape, and size, achieving multicolor up-conversion fluorescence.
Area of Science:
- Materials Science
- Nanotechnology
- Inorganic Chemistry
Background:
- Rare-earth fluorides (NaMF4) are crucial for optical applications.
- Controlling the synthesis of NaMF4 nanocrystals and nanoarrays is challenging.
- Understanding growth mechanisms is key to tailoring properties.
Purpose of the Study:
- To develop a facile hydrothermal method for synthesizing alpha- and beta-NaMF4 nanocrystals and nanoarrays.
- To investigate the influence of synthetic parameters on phase, morphology, and size.
- To achieve multicolor up-conversion fluorescence in doped NaMF4 materials.
Main Methods:
- Hydrothermal synthesis using oleic acid as a stabilizing agent.
- Controlled variation of temperature, time, and reactant concentrations.
- Characterization of phase, morphology, and size of synthesized materials.
Main Results:
- Successful synthesis of alpha-NaMF4 nanocrystals and beta-NaMF4 nanoarrays with tunable properties.
- Phase transformation from cubic (alpha) to hexagonal (beta) NaMF4 controlled by hydrothermal conditions.
- Diverse morphologies of beta-NaMF4 nanoarrays achieved, including tubes, rods, and disks.
- Variable crystal sizes from 5 nm to several micrometers.
- Demonstration of multicolor up-conversion fluorescence (green, red, blue) in doped NaMF4 materials.
Conclusions:
- The hydrothermal method provides precise control over rare-earth fluoride synthesis.
- Growth mechanisms involving diffusion control and interface effects explain nanocrystal formation.
- Tunable morphology and size are achievable through careful adjustment of reaction parameters.
- Synthesized NaMF4 materials exhibit promising up-conversion fluorescence properties for optical applications.
