Crystallization, phase transition and optical properties of the rare-earth doped nanophosphors synthesized by chemical deposition.

Journal Article · Sun Jun 01 00:00:00 EDT 2003 · Nanotechnology

DOI:https://doi.org/10.1088/0957-4484/14/6/320· OSTI ID:961281

Chen, X Y; Yang, L; Cook, R E; Skanthakumar, S; Shi, D; Liu, G K

The structural and electronic properties of Eu{sup 3+}-doped Y{sub 2}O{sub 3} films coated on spherical alumina nanoparticles are studied using transmission electron microscope, x-ray diffraction, and laser spectroscopic techniques. It is observed that the coated films crystallize at temperatures higher than 600{sup o}C and may be completely converted into a cubic Y{sub 2}O{sub 3} nanocrystalline layer at 750{sup o}C. At 900{sup o}C, phase transition occurs between the outer coating layer and the inner core, and different types of crystalline nanophase can be obtained. In the materials that we prepared and studied, all possible crystallographic phases, including two of solid-state laser media, YAlO{sub 3} (YAP), and Y{sub 3}Al{sub 5}O{sub 12} (YAG), may be formed in the pseudo-binary Al{sub 2}O{sub 3}-Y{sub 2}O{sub 3} nanosystem by controlling thermal annealing procedures from 600 to 900{sup o}C, a temperature region far below the conventional solid-state reaction temperature. The spectroscopic properties of Eu{sup 3+} in all the nanophases are characterized in comparison with those of their bulk counterparts.

• Research Organization: Argonne National Lab. (ANL), Argonne, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: DE-AC02-06CH11357
• OSTI ID: 961281
• Report Number(s): ANL/CHM/JA-46176; TRN: US201011%%554
• Journal Information: Nanotechnology, Vol. 14, Issue 6 ; Jun. 2003
• Country of Publication: United States
• Language: ENGLISH

Related Subjects

36 MATERIALS SCIENCE
77 NANOSCIENCE AND NANOTECHNOLOGY
ALUMINIUM OXIDES
ANNEALING
COATINGS
CRYSTALLIZATION
DEPOSITION
DOPED MATERIALS
ELECTRON MICROSCOPES
EUROPIUM IONS
FILMS
LASER SPECTROSCOPY
LASERS
LAYERS
MATERIALS
NANOSTRUCTURES
OPTICAL PROPERTIES
PHASE TRANSFORMATIONS
SOLID STATE LASERS
SYNTHESIS
TEMPERATURE DEPENDENCE
TRANSMISSION
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION
YTTRIUM OXIDES