Abstract
Oxygen vacancies represented by F and F2 centers were detected in faceted Al2O3 nanoparticles with the size less than 10 nm by a photoluminescence method. Al2O3 nanoparticles with such intrinsic defects were synthesized by evaporation of α-Al2O3 in flowing helium using a continuous wave CO2 laser. The XRD analysis showed that the crystal structure of Al2O3 nanoparticles is represented mostly by the low-temperature γ- and/or η-Al2O3 phases. The luminescence maxima of F and F2 centers in the Al2O3 nanoparticles were found to be 3.07 and 2.47 eV. These values are close to the luminescence maxima of F and F2 centers in bulk α-Al2O3.
Original language | English |
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Pages (from-to) | 757-763 |
Number of pages | 7 |
Journal | Optical Materials |
Volume | 75 |
DOIs | |
Publication status | Published - 1 Jan 2018 |
Keywords
- AlO nanoparticles
- Laser evaporation
- Oxygen vacancies
- Photoluminescence
- DEFECTS
- ALUMINA SINGLE-CRYSTALS
- OXIDE
- OPTICAL-PROPERTIES
- IONS
- ALPHA-AL2O3
- ANODIC ALUMINA
- NANOPARTICLES
- LUMINESCENCE
- Al2O3 nanoparticles
- ELECTRONIC EXCITATIONS