Energy Efficiency

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Research Challenge 3: Competing Radiative and Nonradiative Processes

This research challenge aims to develop a microscopic understanding of the competing physical processes that determine light-emission efficiency of InGaN materials and heterostructures. With such understanding, new routes to ultra-high light-emission efficiency at all current densities and all across the visible spectrum might be realized, thus overcoming the blue-efficiency and RYG-gap [intlink id="8173" type="page"]technology challenges[/intlink]. [...]

By | February 1st, 2012|Comments Off on Research Challenge 3: Competing Radiative and Nonradiative Processes

Research Challenge 2: Quantum Dots and Phosphors

Phosphor in powder form. (KLuTa2O7: Eu3+) This research challenge is aimed at studying materials architectures suitable for SSL wavelength down-conversion. Particular materials we have focused on in this research challenge are Eu3+-doped phosphors and group II-VI semiconductor quantum dots (QDs). Among the principal criteria for such wavelength down-conversion materials are a high [...]

By | February 1st, 2012|Comments Off on Research Challenge 2: Quantum Dots and Phosphors

Our SSLS EFRC’s Scientific Research Challenges and Publications

The Solid-State Lighting Science (SSLS) Energy Frontier Research Center (EFRC) works to advance the scientific foundation that underlies current and potential-future SSL technology, and to ultimately enable significant advances in the efficiency with which SSL is produced and used. We do this through the seven scientific research challenges:  one is what one might call [...]

By | February 1st, 2012|Comments Off on Our SSLS EFRC’s Scientific Research Challenges and Publications

Solid-State Lighting Technology: Current State of the Art and Grand Challenges

The graphic on the left shows the anatomy of a state-of-the-art white solid-state lamp; and the graphic on the right shows in the black curve the spectral power density of the light that it emits. The lamp is basically a blue LED coated with green and red phosphors. Some of the blue light leaks through [...]

By | February 1st, 2012|Comments Off on Solid-State Lighting Technology: Current State of the Art and Grand Challenges

Vermont and Sandia National Laboratories Announce Energy Research Center

Vermont—a leader in energy efficiency and deployment of so-called smart-grid technology—will become home to a $15 million national energy research project, officials announced Monday. The Center for Energy Transformation and Innovation will be housed at the University of Vermont. The three-year project is a partnership among the state of Vermont, Sandia National Laboratories [...]

By | December 20th, 2011|Energy Efficiency, Grid Integration, Microgrid, Modeling & Analysis, News, Partnership, SMART Grid|Comments Off on Vermont and Sandia National Laboratories Announce Energy Research Center

Nanoscale Effects on Heterojunction Electron Gases in GaN/AlGaN Core/Shell Nanowires

June 22, 2011 [singlepic id=978 w=320 h=240 float=right] In a paper titled “Nanoscale Effects on Heterojunction Electron Gases in GaN/AlGaN Core/Shell Nanowires” published in Nano Letters, Sandia scientist Bryan M. Wong, and EFRC scientists François Léonard, Qiming Li, and George T. Wang, present a theoretical  and computational study of the electronic properties of core/shell nanowires.  They [...]

By | August 15th, 2011|News, Solid-State Lighting|Comments Off on Nanoscale Effects on Heterojunction Electron Gases in GaN/AlGaN Core/Shell Nanowires

Jeff Tsao participates in “Energy Efficiency and the Rebound Effect” Workshop

June 27-28, 2011 [singlepic id=979 w=320 h=240 float=right] The rebound (or take-back) effect) is the term in energy economics used to describe the effectin which increases in energy efficiency do not necessarily lead to simple 1:1 decreases in energy consumption, but instead are “taken back” in the form of higher consumption of the goods and [...]

By | August 15th, 2011|News, Solid-State Lighting|Comments Off on Jeff Tsao participates in “Energy Efficiency and the Rebound Effect” Workshop

Four-color laser white illuminant demonstrating high color-rendering quality

July 4, 2011 [singlepic id=980 w=320 h=240 float=right]Solid-state lighting is currently based on light-emitting diodes (LEDs) and phosphors.  Solid-state lighting based on lasers would offer significant advantages including high potential efficiencies at high current densities. Light emitted from lasers, however, has a much narrower spectral linewidth than light emitted from LEDs or phosphors.  Therefore it [...]

By | August 15th, 2011|News, Solid-State Lighting|Comments Off on Four-color laser white illuminant demonstrating high color-rendering quality

Light Creation Materials

Light Creation Materials Different families of inorganic semiconductor materials can contribute to solid-state white lighting. The primary chemical systems used for LEDs are Group-III nitrides and Group-III phosphides. It is, however, possible that breakthroughs in a different material system, for example ZnO, will be important. AlGaInN Materials LEDs based on gallium nitride (GaN) and ternary [...]

By | July 14th, 2011|Comments Off on Light Creation Materials

Wavelength Conversion Materials

Rare-Earth Phosphors Inorganic phosphors doped with rare-earth metals are used for a variety of applications. A wide array of these phosphors has been developed for use with fluorescent lamps. The first SSL white LEDs have used an yttrium aluminum garnet doped with trivalent cerium (YAG:Ce+3) to convert output from a blue LED into very [...]

By | July 14th, 2011|Comments Off on Wavelength Conversion Materials