Nerine J. Cherepy
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View article: Systems and methods for fluoride ceramic phosphors for LED lighting
Systems and methods for fluoride ceramic phosphors for LED lighting Open
The present disclosure relates to a lighting component which may comprise a light emitting diode (LED) or laser diode (LD) for generating at least one of blue light or ultraviolet light. A fluoride phosphor matrix may be included, which ma…
View article: Ink-sprayed transparent ceramic multilayer planar waveguides for ribbon lasers
Ink-sprayed transparent ceramic multilayer planar waveguides for ribbon lasers Open
Multilayer transparent ceramic planar waveguides were fabricated using a newly developed particle-loaded ink spraying method, characterized, and lased. Waveguides with five Yb:YAG gain regions and four Lu:YAG index-matched regions were pro…
View article: Phosphor Ceramic Composite for Tunable Warm White Light
Phosphor Ceramic Composite for Tunable Warm White Light Open
Composite phosphor ceramics for warm white LED lighting were fabricated with K2SiF6:Mn4+ (KSF) as both a narrowband red phosphor and a translucent matrix in which yellow-emitting Y3Al5O12:Ce3+ (YAG) particles were dispersed. The emission s…
View article: Workshop on Radiographic Imaging and Applications Research and Development Recommendations for Field Radiography
Workshop on Radiographic Imaging and Applications Research and Development Recommendations for Field Radiography Open
The Workshop on Radiographic Imaging and Applications (WORIA) brought together subject matter experts from industry, academia, US and UK government agencies, and the national laboratories to provide a forum to liaise and share information …
View article: Lutetium oxide-based transparent ceramic scintillators
Lutetium oxide-based transparent ceramic scintillators Open
In one embodiment, a transparent ceramic of sintered nanoparticles includes gadolinium lutetium oxide doped with europium having a chemical composition (Lu.sub.1-xGd.sub.x).sub.2-YEu.sub.YO.sub.3, where X is any value within a range from a…
View article: Plastic scintillator with effective pulse shape discrimination for neutron and gamma detection
Plastic scintillator with effective pulse shape discrimination for neutron and gamma detection Open
In one embodiment, a scintillator material includes a polymer matrix; and a primary dye in the polymer matrix, the primary dye being a fluorescent dye, the primary dye being present in an amount of 5 wt % or more; wherein the scintillator …
View article: Barium iodide and strontium iodide crystals and scintillators implementing the same
Barium iodide and strontium iodide crystals and scintillators implementing the same Open
In one embodiment, a material comprises a crystal comprising strontium iodide providing at least 50,000 photons per MeV, where the strontium iodide material is characterized by a volume not less than 1 cm.sup.3. In another embodiment, a sc…
View article: Phase stable rare earth garnets
Phase stable rare earth garnets Open
A transparent ceramic according to one embodiment includes a rare earth garnet comprising A.sub.hB.sub.iC.sub.jO.sub.12, where h is 3.+-.10%, i is 2.+-.10%, and j is 3.+-.10%. A includes a rare earth element or a mixture of rare earth elem…
View article: Scintillators having the K<sub>2</sub>PtCl<sub>6</sub> crystal structure
Scintillators having the K<sub>2</sub>PtCl<sub>6</sub> crystal structure Open
According to one embodiment, a scintillator includes a host material having the chemical formula: A2BX6, where A includes a monovalent ion, B includes a tetravalent ion, and X includes a halide ion.
View article: Tilted fuel cell apparatus
Tilted fuel cell apparatus Open
Bipolar, tilted embodiments of high temperature, molten electrolyte electrochemical cells capable of directly converting carbon fuel to electrical energy are disclosed herein. The bipolar, tilted configurations minimize the electrical resi…
View article: Fluorescent lighting with aluminum nitride phosphors
Fluorescent lighting with aluminum nitride phosphors Open
A fluorescent lamp includes a glass envelope; at least two electrodes connected to the glass envelope; mercury vapor and an inert gas within the glass envelope; and a phosphor within the glass envelope, wherein the phosphor blend includes …
View article: Transparent ceramic garnet scintillator detector for positron emission tomography
Transparent ceramic garnet scintillator detector for positron emission tomography Open
In one embodiment, a method includes forming a powder having a composition with the formula: AhBiCjO12, where h is 3.+-.10%, i is 2.+-.10%, j is 3.+-.10%, A includes one or more rare earth elements, B includes aluminum and/or gallium, and …
View article: Carbon Fuel Particles Used in Direct Carbon Conversion Fuel Cells
Carbon Fuel Particles Used in Direct Carbon Conversion Fuel Cells Open
A system for preparing particulate carbon fuel and using the particulate carbon fuel in a fuel cell. Carbon particles are finely divided. The finely dividing carbon particles are introduced into the fuel cell. A gas containing oxygen is in…
View article: Plastic scintillators with high loading of one or more metal carboxylates
Plastic scintillators with high loading of one or more metal carboxylates Open
According to one embodiment, a method includes incorporating a metal carboxylate complex into a polymeric matrix to form an optically transparent material. According to another embodiment, a material includes at least one metal carboxylate…
View article: Solution-grown crystals for neutron radiation detectors, and methods of solution growth
Solution-grown crystals for neutron radiation detectors, and methods of solution growth Open
An organic crystal according to one embodiment includes an organic crystal comprising diphenylacetylene and stilbene or a stilbene derivative, the crystal having physical characteristics of formation from solution, the organic crystal exhi…
View article: Fabrication of transparent ceramics using nanoparticles
Fabrication of transparent ceramics using nanoparticles Open
A method of fabrication of a transparent ceramic using nanoparticles synthesized via organic acid complexation-combustion includes providing metal salts, dissolving said metal salts to produce an aqueous salt solution, adding an organic ch…
View article: Fuel cell apparatus and method thereof
Fuel cell apparatus and method thereof Open
Highly efficient carbon fuels, exemplary embodiments of a high temperature, molten electrolyte electrochemical cell are capable of directly converting ash-free carbon fuel to electrical energy. Ash-free, turbostratic carbon particles perfo…
View article: Fabrication of engineered dopant profiles in Er/Lu:YAG transparent laser ceramics via additive manufacturing
Fabrication of engineered dopant profiles in Er/Lu:YAG transparent laser ceramics via additive manufacturing Open
Transparent ceramic Er:YAG laser rods were fabricated via the direct ink write (DIW) method with engineered doping profiles featuring an Er-doped core with endcaps and core-clad structures. Laser rods up to 11 cm in length were produced wh…
View article: An automated fast neutron computed tomography instrument with on-line focusing for non-destructive evaluation
An automated fast neutron computed tomography instrument with on-line focusing for non-destructive evaluation Open
A fast neutron tomography imaging instrument has been designed, built, and tested at The Ohio State University 500 kW Research Reactor on a fast neutron beamline with a peak neutron flux ≈5.4 × 107 n·cm−2·s−1 at 1.6 MeV median neutron ener…
View article: Fused x-ray and fast neutron CT reconstruction for imaging large and dense objects
Fused x-ray and fast neutron CT reconstruction for imaging large and dense objects Open
Megavolt x-ray computed tomography (CT) is a powerful tool for three-dimensional characterization. However, its utility is limited for large objects composed of high-atomic number (Z) materials, where x rays fail to penetrate. Information …
View article: Additively manufactured transparent ceramic thin disk gain medium
Additively manufactured transparent ceramic thin disk gain medium Open
A novel type of Yb:YAG transparent ceramic thin disk laser amplifier is demonstrated, based on fabricating a composite gain element with a paraboloidal interface between gain and no-gain regions and employing side-pumping of the thin disk.…
View article: Silicon Photomultipliers Coupled to Scintillators With the Emission Maximum at 550 nm
Silicon Photomultipliers Coupled to Scintillators With the Emission Maximum at 550 nm Open
A majority of the silicon photomultipliers (SiPMs) are sensitive to blue and near-ultraviolet (NUV) photons that are not optimized for scintillators with the emission maximum at wavelengths longer than 500 nm. The red–green–blue (RGB) SiPM…
View article: Beta Radiation Hardness of GYGAG(Ce) Transparent Ceramic Scintillators
Beta Radiation Hardness of GYGAG(Ce) Transparent Ceramic Scintillators Open
GYGAG(Ce) transparent ceramic garnet scintillators were irradiated with electrons from 0.5 to 2 MeV with fluences from 1016e– /cm2 to 1019e– /cm2, corresponding to doses from 0.3 to 310 Gigarad. Absorption spectra were measured before and …
View article: Quantifying spatial resolution in a fast neutron radiography system
Quantifying spatial resolution in a fast neutron radiography system Open
Neutron imaging is a powerful nondestructive examination modality that has been employed in various applications. Fast neutrons provide advantages over lower energy neutrons, such as examining thicker samples and inducing negligible activa…
View article: Neutron Transmission Imaging with a Portable D-T Neutron Generator
Neutron Transmission Imaging with a Portable D-T Neutron Generator Open
Fast-neutron transmission imaging provides complementary information to x-ray transmission imaging. While fast neutron imaging resolution is generally below x-ray imaging, 14-MeV neutrons have an advantage over portable x-ray systems. Neut…
View article: Material jet printing of transparent ceramic Yb:YAG planar waveguides
Material jet printing of transparent ceramic Yb:YAG planar waveguides Open
A new, to the best of our knowledge, 3D additive manufacturing technique utilizing particle-loaded ink jet printing to fabricate transparent ceramic Yb:YAG planar waveguides for laser gain media was demonstrated. Rheological optimization o…