Energy and Climate

SAND 2012-0752 P

Research Challenge 6: Beyond Spontaneous Emission

On February 3, 2012, in

This research challenge explores radiative processes that go beyond incoherent emission. For example, although LEDs (based on spontaneously emitted incoherent light) are presently thought of as the source of choice for white light generation. However, coherent light sources have many potential benefits, including ultra-high efficiency, narrow linewidths, improved directionality of light, and the potential to […]

Research Challenge 5: Enhanced Spontaneous Emission

On February 3, 2012, in

Our explorations focus on two nanophotonic approaches for modifying the emission environment: controlling the photonic density of states (photonic crystals) and introducing intense localized electromagnetic fields (surface plasmonics). Both approaches require integration of emitters with dielectric, plasmonic, or photonic crystal cavities, which we accomplish through nanofabrication and epitaxial growth (photonic crystals, fabricated metallic structures), chemical […]

Research Challenge 4: Defect-Carrier Interactions

On February 3, 2012, in

This research challenge aims to develop an in-depth understanding of the electrical, optical and structural properties of defects in InGaN materials and heterostructures. With such understanding, routes to circumventing a key contributor to nonradiative carrier recombination might be realized, helping to overcome the blue-efficiency, RYG-gap, and functional-light . Our study of defects involves unique experimental […]

Research Challenge 1: Nanowires

On February 3, 2012, in

This research challenge explores the synthesis and properties of GaN/InGaN nanowires as a materials architecture for visible light-emission. If nanowire devices could span the entire visible spectrum, the RYG-gap  would be overcome. In addition, such full-spectrum emission would enable chromaticity-tunable light, which could also impact so-called smart (or higher functionality) lighting, another . Among  InGaN […]

Research Challenge 3: Competing Radiative and Nonradiative Processes

On February 1, 2012, in

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 .  Along with this […]

Page 1 of 212