ZnO-infiltrated opal: influence of the stop-zone on the UV spontaneous emission

Photoluminescence from ZnO–SiO2 opals with different sphere diameters and thicknesses

“…It is noticed that both ZnO-A and ZnO-B exhibit an increase of the UV/Vis ratio compared with pure ZnO nanocrystals film. Recently, Emelchenko et al [18] reported that the use of SiO 2 opals and an incomplete filling of pores by ZnO nanocrystals increase the edge excitonic emission at room temperature. Fig.…”

Infiltration of silica colloidal crystals with molten salts and semiconductors under capillary forces

“…The solution-based techniques are used for infiltration of pores of both bulk opals [7,8,14] and opal films [11][12][13]15]. These techniques can result in ∼90% opal pore filling [3,16], however, multiple infiltrations [8], up to several dozens of infiltration runs [14], are needed.…”

Emission studies on ZnO-inverse photonic crystals derived from self-assembly

“…There are a number of techniques by which 3D photonic crystals can be fabricated, among which the self-assembly technique is the simplest and the least expensive [4]. In earlier works, a high index contrast in self-assembled polymeric photonic crystals was achieved by infiltrating the direct 3D photonic crystals with a higher index material such as silica, ZnO, titania, silicon and germanium by different techniques [5][6][7][8] and the polymer template was subsequently removed to get the inverse photonic crystal.…”