LEDs for Photons, Physiology and Food
(PM Pattison, JY Tsao, GC Brainard and B Bugbee) Nature 563, 493-500 (2018) (SAND2018-13453 J)
Perspectives article on the future of LED lighting: not just more energy efficient, but vastly better able to control the color, intensity and distribution of light, enabling light to be used both as a signal for specific physiological responses in humans and plants as well as an efficient fuel for fresh food production.
LED Lighting Efficacy: Status and Directions
(PM Pattison, M Hansen, JY Tsao) (SAND2018-7339 J)
Review article in special March-April 2018 issue of Comptes Rendus Physique on “LEDs: The New Revolution in Lighting,” edited by Claude Weisbuch, Erich Spitz and Aurelien David.
The New World of Engineered SSL: Past & Present, but mostly Future (5 SSL Grand Challenges)
(JY Tsao) (SAND2017-12137C)
Plenary talk given at the OSA Light Energy Environment Boulder CO November 8, 2017.
Roland Haitz: Twenty Years of Mentorship, Collaboration and Inspiration
(JY Tsao) (SAND2015-7782S) Unpublished (2015)
Memorial tribute to Roland Haitz, one of the great pioneers and visionaries of solid-state lighting technology.
The Blue LED Nobel Prize: Historical context, current scientific understanding, human benefit
(JY Tsao, J Han, RH Haitz, PM Pattison) (SAND2015-4440J) Ann. Phys. 527, A53-A61 (2015)
Expert opinion for special issue containing the Blue LED Nobel Prize Lectures.
Toward Smart and Ultra-Efficient Solid-State Lighting
(JY Tsao, MH Crawford, ME Coltrin, AJ Fischer, DD Koleske, GS Subramania, GT Wang, JJ Wierer, RF Karlicek) (SAND 2014-3937J) Advanced Optical Materials 2, 809-836 (2014)
Review of the current status of solid-state lighting relative to its ultimate potential to be “smart” and ultra-efficient.
Comparison between blue lasers and light-emitting diodes for future solid-state lighting
(Jon Wierer, Jeff Tsao, Dmitry Sizov) Laser & Photonics Reviews (August, 2013) (SAND2013-1956)
This article compares LEDs and LDs (laser diodes) for future SSL: their current state-of-the-art input-power-density-dependent power conversion efficiencies; potential improvements both in their peak power-conversion efficiencies and in the input power densities at which those efficiencies peak; and their economics for practical SSL.
Four-color laser white illuminant demonstrating high color-rendering quality
(Sasha Neumann, Jon Wierer, Wendy Davis, Yoshi Ohno, Steve Brueck, Jeff Tsao) Optics Express 19, A982-990 (2011) SAND2011-2743J.
This work tests the common belief that white light produced by a set of lasers of different colors would not be of high enough quality for general illumination.
Solid-state lighting: ‘The case’ 10 years after and future prospects
(Roland Haitz, Jeff Tsao) (SAND 2010-4208J) Physica Status Solidi A 208, 17-29 (2011).
Ten years ago, a white paper titled “The Case for a National Research Program on Semiconductor Lighting” outlined the promise and potential of semiconductor light-emitting diodes (LEDs) for general illumination. Since then, investments in the now-renamed field of solid-state lighting (SSL) have accelerated and considerable progress has been made, not always in the directions envisioned at the time. In this paper, two of the original four authors comment on the white paper’s hits and misses, while making the original white paper available archivally as supplemental online material. Finally, we make new predictions for the coming 10-20 years.
Solid-state lighting: Sandia’s Energy Frontier Research Center (EFRC) for Solid-State Lighting Science
Overview talk given at Sandia April 13, 2011. (Jeff Tsao) (SAND2011-5968C) Audio here. PDF of slides and notes just below.
(Lighting and) Solid-State Lighting: Science, Technology, Economic Perspectives
(Jeff Tsao) (SAND2010-1090C) Talk given August 1, 2010 at SPIE Optics + Photonics in San Diego. Video here. Slides just below.
Solid-State Lighting: An Integrated Human Factors, Technology and Economic Perspective
(Jeff Tsao, Mike Coltrin, Mary Crawford, Jerry Simmons) (July 2010) (SAND 2009-5551J) (Proceedings of the IEEE 98, 1162-1179)
In this article, we present a high-level overview of solid-state lighting, with an emphasis on white lighting suitable for general illumination. We characterize in detail solid-state lighting’s past and potential-future evolution using various performance and cost metrics, with special attention paid to inter-relationships between these metrics imposed by human factors, technology and economic considerations.
Solid-State Lighting: The III-V Epi “Killer App”
(Jeff Tsao) (May 2010) (SAND 2010-4049C) and video
This talk was given at the International Conference on Metal-organic Vapor Phase Epitaxy (ICMOVPE) May 24 2010 in Lake Tahoe, NV.
The Next Semiconductor Revolution: This Time It’s Lighting!
(Jeff Tsao) (Mar 2010) (SAND 2010-1957P) and video
This tutorial talk for students and the general public was given at the Albuquerque Academy March 31 2010 in Albuquerque NM.
(Lighting and) Solid-State Lighting: Science, Technology, Economic Perspectives
(Jeff Tsao) (Jan 2010) (SAND 2010-1090C) and video
This talk was given at Photonics West Jan 26 2010 in San Francisco, CA.
Research challenges to ultra-efficient inorganic solid-state lighting
(Julie Phillips, Mike Coltrin, Mary Craford, Art Fischer, Mike Krames, Regina Mueller-Mach, Gerd Mueller, Yoshi Ohno, Lauren Rohwer, Jerry Simmons, Jeff Tsao) (SAND 2007-5470J) and figures (Laser and Photonics Reviews 1, 307-333 (November 2007)
This review article discusses approaches to inorganic solid-state lighting that could conceivably achieve ultra-high (70% or greater) efficiency, and the significant research questions and challenges that would need to be addressed if one or more of these approaches were to be realized.
(Kevin Boyack, Jeff Tsao, Ann Miksovic, Mark Huey) (SAND2008-4564) (2009)
This report analyzes a comprehensive dataset of English-language articles and U.S. patents published or issued in the knowledge domain of electroluminescent materials and phenomena. A number of analyses were performed, including: identification of knowledge sub-domains of historical and recent importance, and trends over time of the contributions of various nations and continents to the knowledge domain and its sub-domains.
Solid-State Lighting: a Case Study in Science and Technology Evolution
(Jeff Tsao) (July 2006) (SAND 2006-4047A)
This talk was given at the 2006 China International Forum on Solid-State Lighting (CIFSSL) in Shenzhen, China.
Technology Footprinting and Solid-State Lighting
(Jeff Tsao, Kevin Boyack, Mark Huey, Ann Miksovic, June 2006) (SAND 2006-7621P)
This work was sponsored by the U.S. Department of Energy Office of Energy Efficiency and Renewable Energy Building Technologies Program. This set of viewgraphs explores the development of a tool that might be called “technology footprinting,” and the preliminary application of that tool to solid-state lighting.
Solid-State Lighting: the Potential and the Challenges
(Jeff Tsao) (August 11-12 2005) (SAND 2005-4894A)
These two lectures were given in two half-days at the Institute of Materials Research and Engineering (IMRE) in Singapore.
Evolution of Solid-State Lighting: Market Pull and Technology Push
(Jeff Tsao) (April 2005) (SAND 2008-2251C) and notes
This talk was given at the 2005 China International Forum on Solid-State Lighting (CIFSSL) in Xiamen, China.
Solid-State Lighting: Lamps, Chips and Materials for Tomorrow
(Jeff Tsao) (IEEE Circuits and Devices Magazine Vol 20 Issue 3 pp 28-37, May-June 2004) (SAND 2003-3018J)
The aims of this article were twofold. First, a brief overview of conventional and SSL lighting technologies was given. Second, a description was given of some of the simplest but most important lamp, chip, and materials design choices that would need to be made if SSL technology is to fulfill its promise for general illumination.
(SAND 2004-2365, May 2004)
This SAND report was the final report on Sandia’s Grand Challenge LDRD SSL Project This project is considered one of Sandia’s most successful GCLDRDs. This report reviews not only technical highlights, but also the genesis of the idea for SSL, the initiation of the SSL GCLDRD, and the goals, scope, success metrics, and evolution of the SSL GCLDRD over the course of its life.
(Jeff Tsao) (Laser Focus World Vol 39 Issue 5 pp S11-S14, May 2003) (SAND 2003-0556J)
A summary of the 2002 SSL roadmap, with a special emphasis on energy savings projections.
Light Emitting Diodes (LEDs) for General Illumination
(Jeff Tsao, Ed.) (November 2002) (SAND 2002-3408P)
This report was the first comprehensive SSL technology roadmap, and provided quantitative enumeration of key technology targets, prioritization of research challenges, and key decisions related to competing approaches. It also discussed lighting systems issues necessary to achieve mass penetration of LEDs in the marketplace.
Solid-State Lighting: Illumination through Semiconductor Science Website
A website, actively maintained from December 2001 through September 2006, whose intent was “to gather together information relevant to solid-state lighting, and to help stimulate the development of the science and technology foundation necessary to enable the promise and potential of solid-state lighting.”
The Case for a National Research Program on Semiconductor Lighting
(Roland Haitz, Fred Kish, Jeff Tsao, Jeff Nelson, July 2000) (SAND 2000-1612)
This white paper was the first to discuss the vast technological and energy-savings potential of solid-state lighting technology.
“Light for the 21st Century” Year 2000 Report of Results
(The Japan Research and Development Center of Metals, 2000, translated by Kirill V. Sereda and Jeff Y. Tsao)
This was the first national program aimed at the development of compound semiconductors for high efficiency optoelectronic conversion for general illumination purposes.