Energy and Climate

Energy & Climate News

Sandia Develops a Synthesis of Quantum Dots that Increases the Quantum Yield to 95.5%

White light-emitting diodes (LEDs) based on blue indium-gallium-nitride (InGaN) LEDs that excite yellow-green-emitting yttrium-aluminum-garnet: cerium phosphors (YAG:Ce, a nonhygroscopic, chemically inert inorganic scintillator) have a cold white emission that can be made warmer with the addition of a red-emitting component. Unfortunately, red emitters that satisfy all criteria for use in solid-state lighting (SSL) applications are [...]

Phonon Scattering by Crystallographically Coherent Domain Walls

Sandia staff members Jon Ihlefeld (in the Elec­tronic, Optical, & Nanostructured Materials Dept.) and Stephen Lee (in the Semiconductor Material and Device Sciences Dept.) in collaboration with professors Patrick Hopkins (Univ. of Virginia), Bryan Huey (Univ. of Connecticut), and Darrell Schlom (Cornell Univ.) recently published “Effects of coherent ferroelastic domain walls on the thermal conductivity [...]

Epitaxial Growth of La2O3 on Gallium Nitride and Measuring Band Offsets

Sandians Jon Ihlefeld (in the Electronic, Optical, & Nanostructured Materials Dept.), Mike Brumbach (in the Materials Characterization and Performance Dept.), and Stan Atcitty (in the Energy Storage Technology and Systems Dept.) recently published the article “Band offsets of La2O3 on (0001) GaN grown by reactive molecular-beam epitaxy” in Applied Physics Letters outlining research to prepare [...]

Sandia Invents Versatile High-Temperature Seebeck and Electrical Conductivity Instrument

Sandia post­doc Harlan Brown-Shaklee (in the Electronic, Optical, and Nanostructured Materials Dept.) and staff members Jon Ihlefeld (also in the Electronic, Optical, and Nanostructured Materials Dept.) and Peter Sharma (in the Materials Physics Dept.) have built a high-temperature Seebeck and electrical conductivity measurement instrument that can operate over broad atmosphere and temperature conditions. The Seebeck [...]

Paper Describing Lessons Learned from Fukushima Receives “Outstanding Paper Award”

Jeff Cardoni (in the Severe Accident Analysis Dept.) presented the paper “MELCOR Simulations of the Severe Accident at the Fukushima 1F3 Reactor” at the 2012 ANS Winter Meeting and Nuclear Technology Expo, which held an embedded topical meeting called “International Meeting on Severe Accident Assessment and Management: Lessons Learned From Fukushima Daiichi.” on November 11–15, [...]

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