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Published on: April 14, 2020
Pressure effect on optical properties and structure stability of LaPO4:Eu(3+) microspheres
Zhi Zhao1, Xianwen Zhang, Jian Zuo
1Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China, Hefei, Anhui 230026, China.
Journal of Nanoscience and Nanotechnology
|December 9, 2010
Summary
Hydrothermal synthesis of LaPO4:Eu(3+) spheres revealed distinct high-pressure structural transformations. Hexagonal urchin-like structures showed greater stability under pressure compared to monoclinic core-shell spheres.
Area of Science:
- Materials Science
- Solid State Chemistry
- Nanomaterials
Background:
- Lanthanum phosphate doped with Europium (LaPO4:Eu(3+)) is a promising phosphor material.
- Understanding its structural and photoluminescent properties under pressure is crucial for applications.
Purpose of the Study:
- To synthesize and characterize two distinct morphologies of LaPO4:Eu(3+) spheres.
- To investigate the high-pressure behavior of these materials using photoluminescence and Raman spectroscopy.
Main Methods:
- Hydrothermal synthesis for LaPO4:Eu(3+) spheres (core-shell and urchin-like).
- High-pressure studies up to 28 GPa using diamond anvil cells.
- Photoluminescence and Raman spectroscopy analysis.
Main Results:
- Both morphologies exhibited similar luminescence at ambient pressure.
- Increased pressure led to decreased emission intensity and red-shifted peaks due to enhanced crystal-field strength and covalency.
- Monoclinic spheres became amorphous, while hexagonal spheres transformed to monoclinic and then amorphous structures at specific pressures.
Conclusions:
- The morphology of LaPO4:Eu(3+) spheres significantly influences their high-pressure structural stability.
- Hexagonal urchin-like structures demonstrate enhanced resilience to pressure-induced amorphization compared to monoclinic core-shell structures.
