Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10638262 | Materials Chemistry and Physics | 2005 | 5 Pages |
Abstract
The present paper describes the process of preparing nano-scaled and well-crystallized cerium-doped yttrium aluminum garnet (YAG:Ce) crystalline phosphors synthesized by co-precipitation method with the addition of hexamethyldisilazane (HMDS) as OH-scavenging reagent. Thermal analyzer and X-ray diffractometer measurements showed that pure YAG phase could be got at the temperature of 900 °C lower than that by solid-state method. It was also found that smaller size crystallites (â¼33 nm) were made after the HMDS treatment under the transmission electron microscope (TEM) observation. We inferred that it was achieved by reducing the surface condensing hydroxyl groups and by restricting the grain boundary motion due to second-phase particles pinning. Meanwhile, optical properties of YAG:Ce prepared in the present work were examined and showed that the photoluminescence intensity of the co-precipitated YAG:Ce crystallites plus HMDS treatment was better than those prepared by solid-state reaction or co-precipitation without any further treatment. It was proposed that the existing second-phase particles as well as higher specific surface area of nano-scaled YAG:Ce crystallites enhance the absorption of excitation.
Related Topics
Physical Sciences and Engineering
Materials Science
Electronic, Optical and Magnetic Materials
Authors
Yung-Tang Nien, Yu-Lin Chen, In-Gann Chen, Chii-Shyang Hwang, Yan-Kuin Su, Shoou-Jinn Chang, Fuh-Shyang Juang,