| Autor: |
Kuo-Min Lin, Chih-Cheng Lin, Yuan-Yao Li |
| Rok vydání: |
2007 |
| Předmět: |
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| Zdroj: |
Journal of Luminescence. 126:795-799 |
| ISSN: |
0022-2313 |
| DOI: |
10.1016/j.jlumin.2006.11.014 |
| Popis: |
The sol–gel method using GdCl 3 and EuCl 3 was used to prepare Eu 3 + -doped Gd 2 O 3 nanopowders with particle sizes ranging from 50 to 200 nm. This preparation was followed by a calcination process at 800 – 1100 ∘ C . The effects which the Eu/Gd composition ratio and calcination temperature had on the phosphor structure and its luminescent properties were then investigated. Phosphor structure was examined by X-ray diffraction, field emission scanning electron microscopy, and transmission electron microscopy. The results confirm that the material consists of Gd 2 O 3 : Eu 3 + particles exhibiting good crystallinity. Photoluminescence and cathodoluminescence measurements of the Gd 2 O 3 : Eu 3 + particles show red emission at the 612 nm ( D 0 5 → F 2 7 ) wavelength. The optimal molar concentration for obtaining the highest PL intensity for Gd 2 O 3 : Eu 3 + was 7% of Eu 3 + (calcinated at 1000 ∘ C for 2 h). |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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