Abstract:
Electric sintering of precursor materials to prepare phosphor ceramics is described herein. The phosphor ceramics prepared by electric sintering may be incorporated into devices such as light-emitting devices, lasers, or for other purposes.
Abstract:
Described herein are medical elements for reducing intra-patient microbial contamination. The elements include an acoustically transmissive matrix and an antimicrobial element.
Abstract:
A laminated composite includes a wavelength-converting layer and a non-emissive blocking layer, wherein the emissive layer includes a garnet host material and an emissive guest material, and the non-emissive blocking layer includes a non-emissive blocking material. The metallic element constituting the non-emissive blocking material has an ionic radius which is less than about 80% of an ionic radius of an A cation element when the garnet or garnet-like host material is expressed as Α 3 Β 5 O 12 and/or an element constituting the emissive guest material, and the non-emissive blocking layer is substantially free of the emissive guest material migrated through an interface between the emissive layer and the non-emissive blocking layer.
Abstract:
Electric sintering of precursor materials to prepare phosphor ceramics is described herein. The phosphor ceramics are prepared by applying an electric current, such as a pulse electric current, to the precursor compositions. The sintering is carried out under pressure to produce dense phosphor ceramics which may be incorporated into devices such as light-emitting devices, lasers, or used for other purposes.
Abstract:
Disclosed herein are emissive ceramic materials having a dopant concentration gradient along a thickness of a yttrium aluminum garnet (YAG) region. The dopant concentration gradient may include a maximum dopant concentration, a half-maximum dopant concentration, and a slope at or near the half-maximum dopant concentration. The emissive ceramics may, in some embodiments, exhibit high internal quantum efficiencies (IQE). The emissive ceramics may, in some embodiments, include porous regions. Also disclosed herein are methods of make the emissive ceramic by sintering an assembly having doped and non-doped layers.
Abstract:
Embodiments of the present invention relate to semiconducting carbon-containing devices and methods of making thereof. The semi-conducting carbon containing devices comprise an n-type semiconducting layer and a p-type semiconducting layer, both of which are positioned over a substrate. The n-type semiconducting layer can be formed by pyrolyzing a carbon- and nitrogen-containing polymer, and the p-type semiconducting layer can be formed by pyrolyzing an aromatic- and aliphatic-group-containing polymer. In some embodiments, the devices are solar cell devices.
Abstract:
Some phosphor powders can be difficult to form into ceramic compacts because they are difficult to sinter. As described herein, phosphor powders that can degrade under conventional sintering temperatures can be sintered by heating the powder at a lower temperature, such as less than 800°C, while the powder is under greater than atmospheric pressure, such as at least 0.05 GPa. Phosphor ceramic compacts prepared by this method, and light-emitting devices incorporating these phosphor ceramic compacts, are also described.
Abstract:
Wavelength converting elements are described herein that include a polymer and a 4, 7-benzotriazole chromophore. Solar water heaters are described herein that incorporate wavelength converting layers to improve their efficiency.