Energy Efficiency

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Unconventional Lasing

Unconventional Lasing in Organic Semiconductors (Watch Video) Speaker: Stephane Kena-Cohen, Imperial College, UK Date: September 14, 2011 Event: Solid-State Lighting Science Workshop in Novel Emitters and Nanostructured Materials Abstract: The high optical gain and versatility afforded by organic semiconductors make them an attractive medium for the realization of coherent light sources. It is clear, however, [...]

By |July 30th, 2012|Comments Off on Unconventional Lasing

Polariton Lasing

Polariton Lasing by Intra-cavity Pumping in the Strong-Coupling Limit and Enhancement of Molecular Fluorescence in Critically Coupled Resonators Speaker: Vladimir Bulovic, Massachusetts Institute of Technology Date: September 14, 2011 Event: Solid-State Lighting Science Workshop in Novel Emitters and Nanostructured Materials Abstract: The strongly coupled states of light and matter in microcavities, known as polaritons, can [...]

By |July 30th, 2012|Comments Off on Polariton Lasing

Spontaneous Coherence and Spin Texture

Spontaneous Coherence and Spin Texture in a Cold Exciton Gas (Watch Video) Speaker: Leonid Butov, University of California, San Diego Date: September 14, 2011 Event: Solid-State Lighting Science Workshop in Novel Emitters and Nanostructured Materials Abstract: An indirect exciton is a bound pair of an electron and a hole confined in spatially separated layers. Indirect [...]

By |July 30th, 2012|Comments Off on Spontaneous Coherence and Spin Texture

Quantum Optics

Quantum Optics with a Single Semiconductor Quantum Dot Speaker: Weng Chow, EFRC Scientist Date: September 14, 2011 Event: Solid-State Lighting Science Workshop in Novel Emitters and Nanostructured Materials Abstract: There is recent interest in strong light-matter interaction in semiconductors and its uses in optoelectronics. Exploring these possibilities requires extending the Jaynes-Cummings model to include many-body [...]

By |July 30th, 2012|Comments Off on Quantum Optics

‘Giant’ Nanocrystal Quantum Dots

  ‘Giant’ Nanocrystal Quantum Dots: A New Class of Optical Nanomaterials for Light Emission Applications (Video Pending) Speaker: Jennifer Hollingsworth, Los Alamos National Laboratory Date: September 14, 2011 Event: Solid-State Lighting Science Workshop in Novel Emitters and Nanostructured Materials

By |July 30th, 2012|Comments Off on ‘Giant’ Nanocrystal Quantum Dots

III-Nitride Nanowires

III-Nitride Nanowires: Novel Emitters for Lighting Speaker: George Wang, EFRC Thrust Leader Date: September 14, 2011 Event: Solid-State Lighting Science Workshop in Novel Emitters and Nanostructured Materials Abstract: 1D nanostructures, such as nanowires and nanorods, based on the III nitride (AlGaInN) materials system have attracted attention as potential nanoscale building blocks in LEDs, lasers, sensors, [...]

By |June 14th, 2012|Comments Off on III-Nitride Nanowires

Research Challenge 6: Beyond Spontaneous Emission

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 [...]

By |February 3rd, 2012|Comments Off on Research Challenge 6: Beyond Spontaneous Emission

Research Challenge 5: Enhanced Spontaneous Emission

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 [...]

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Research Challenge 4: Defect-Carrier Interactions

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 technology challenges. Measured density of an InGaN [...]

By |February 3rd, 2012|Comments Off on Research Challenge 4: Defect-Carrier Interactions

Research Challenge 1: Nanowires

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 technology challenges 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 technology [...]

By |February 3rd, 2012|Comments Off on Research Challenge 1: Nanowires