Photoluminescence and microstructure investigation of SiO2@Y:Eu photonic bandgap crystals
Journal
Journal of the American Ceramic Society
Journal Volume
91
Journal Issue
12
Pages
3976-3980
Date Issued
2008
Author(s)
Abstract
A photonic bandgap (PBG) crystal was established by self‐assembly of monodispersed SiO 2 submicrometer spheres. SiO 2 @Y 2 O 5 /or Y 2 SiO 5 :Eu 3+ phosphors were then prepared by coating of Y 3+ and Eu 3+ at various concentrations on SiO 2 PBG crystal templates. After calcination, red emission was obtained. In this study, the photoluminescent properties varied with different SiO 2 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 SiO 2 @Y 2 O 3 /or Y 2 SiO 5 :Eu 3+ with a uniform 4–10 nm thickness of the crystalline shell layer.
Type
journal article