Silika esaslı nadir toprak elementleri katkılı fotonik kristallerin geliştirilmesi

Photonic crystal technology has become very popular today with its increasing application areas. Photonic crystal materials, which consist of regular units arranged in nanoscale, can give highly advanced properties to the structure. The aim of this thesis is to develop silica based photonic crystal structures doped by rare-earth elements. Firstly, the production of polymethylmethacrylate (PMMA) based opal photonic crystals with the three-dimensional regular array was carried out. These structures, which also exhibit photonic crystal properties itself, also serve as templates for inverse opal photonic crystal production. For opal photonic crystal structure, PMMA colloids were produced from methyl methacrylate. Produced colloids were arranged by the fast-sedimentation deposition method. The effects of the production conditions and deposition media on the PMMA based opal photonic crystal coatings were investigated. PMMA opal photonic crystal template produced under the determined optimum conditions was used to produce silica-based inverse opal photonic crystal coatings. The sol-gel infiltration method was applied in order to produce silica based inverse opal photonic crystal structures. Rare earth elements such as Cerium (Ce), Europium (Eu), Samarium (Sm) and Terbium (Tb) were doped into silica-based inverse opal photonic crystal structures. The effect of doping types in the range of 0.5%-2% (in mole) on inverse opal photonic crystal structures was investigated. As a result of these studies, structural colored three dimensional opal and inverse opal photonic crystal coatings were produced successfully. Structural colors of the opal photonic crystal coatings can be controlled by the PMMA colloid size change, while structural colors of silica inverse opal photonic crystal coatings can be controlled by rare earth element doping.