| Autor: |
Sung-En Lin, Bang-Ying Yu, Jing-Jong Shuye, Wei, Wen-Cheng J. |
| Předmět: |
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| Zdroj: |
Journal of the American Ceramic Society; Dec2008, Vol. 91 Issue 12, p3976-3980, 5p, 6 Black and White Photographs, 1 Chart, 4 Graphs |
| Abstrakt: |
A photonic bandgap (PBG) crystal was established by self-assembly of monodispersed SiO2 submicrometer spheres. SiO2@Y2O5/or Y2SiO5:Eu3+ phosphors were then prepared by coating of Y3+ and Eu3+ at various concentrations on SiO2 PBG crystal templates. After calcination, red emission was obtained. In this study, the photoluminescent properties varied with different SiO2 sizes (periodicity of the PBG crystal), structure (ordered or random arrangement), and different calcination temperatures. Apparent enhancement of emission can be obtained in the phosphor with an ordered PBG crystal character because of the band-edge effect. Transmission electron microscopy cross-sectional images showed a core–shell structure of SiO2@Y2O3/or Y2SiO5:Eu3+ with a uniform 4–10 nm thickness of the crystalline shell layer. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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