Preparation and Modified Upconversion Luminescence In NaGd(WO$lt;inf$gt;4$lt;/inf$gt;)$lt;inf$gt;2$lt;/inf$gt;:Yb$lt;sup$gt;3+$lt;/sup$gt;/Tm$lt;sup$gt;3+$lt;/sup$gt; Inverse Opal Photonic Crystals
نویسندگان
چکیده
منابع مشابه
Fragility of photonic band gaps in inverse-opal photonic crystals
Inverse-opal techniques provide a promising routine of fabricating photonic crystals with a full band gap in the visible and infrared regimes. Numerical simulations of band structures of such systems by means of a supercell technique demonstrate that this band gap is extremely fragile to the nonuniformity in crystals. In the presence of disorder such as variations in the radii of air spheres an...
متن کاملAn experimental study of strongly modified emission in inverse opal photonic crystals
We present the first experiments that demonstrate strong angle-independent modification of spontaneous emission spectra from laser dyes in photonic crystals, made of inverse opals in titania. We show that both the fluorescence quantum efficiency and weak disorder play a key role in interpreting the experimental data. We compare the angle-independent emission spectra of dye in photonic crystals ...
متن کاملConformally Back-Filled, Non-close-packed Inverse-Opal Photonic Crystals
Photonic crystals (PCs) offer far greater control over the generation and propagation of light than any other material structures. Their defining characteristics, omnidirectional and directional photonic bandgaps (PBGs), can be manipulated to enable effects such as low losses in optical circuits and control of spontaneous emission. PCs are also creating much excitement because of their ability ...
متن کاملFilling Fraction Dependent Properties of Inverse Opal Metallic Photonic Crystals
Metallic photonic crystals, metal-based structures with periodicities on the scale of the wavelength of light, have attracted considerable attention due to the potential for new properties, including the possibility of a complete photonic bandgap with reduced structural constraints compared to purely dielectric photonic crystals, unique optical absorption, thermally stimulated emission behavior...
متن کاملDirectional fluorescence spectra of laser dye in opal and inverse opal photonic crystals.
We have investigated the fluorescence from R6G dye molecules embedded in fcc photonic crystals with a large range of lattice parameters. Both polystyrene opals and alumina inverse opals are studied, allowing us to compare direct and inverted structures. We observe clear stop bands in the fluorescence spectra, whose center positions, widths, and depths are analyzed and compared to stop bands fro...
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ژورنال
عنوان ژورنال: Journal of Inorganic Materials
سال: 2016
ISSN: 1000-324X
DOI: 10.15541/jim20160104