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General Info
Contact Information:
Voice
(505) 844-7092
Fax
(505) 844-4045
Cell (505) 480-4267
Email: jytsao@sandia.gov.
Brief BioJeff is currently a Principal Member of
Technical Staff at Sandia National Laboratories, where his work involves
integrated science, technology and economic modeling in Solid-State Lighting
and other areas. He is also exploring embedded-network
models of the evolution of social knowledge – an emerging approach to the
field of “evolutionary epistemology.”
During 2000-2001 Jeff served as
vice-president of R&D at E2O Communications, Inc., a U.S.-based pre-IPO
fiber communications components company.
During 1993-2000, he served as manager of various technical groups at
Sandia National Laboratories in the area of compound semiconductor materials
and devices. In 1998, he took a
sabbatical at the
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Evolutionary
epistemology
Galileo’s
Stream: A Framework for Understanding Knowledge Production (Jeff Tsao,
Kevin Boyack, Mike Coltrin, Jessica Turnley, Wil Gauster) (SAND 2006-7622J) (Research
Policy 37, 330-352) (March 2008) This paper introduces a new framework for understanding
knowledge production in which:
knowledge is produced in stages (along a research to development
continuum) and in three discrete categories (science and understanding, tools
and technology, and societal use and behavior); and knowledge in the various
stages and categories is produced both non-interactively and interactively.
energy
The World’s
Appetite for Light: A Simple Empirical
Expression Spanning Three Centuries and Six Continents (Jeff Tsao, Paul
Waide) (SAND 2007-4791J) (May 2008 revision, submitted to The Energy Journal) A simple empirical
expression, in which consumption of artificial light depends linearly on the
ratio between gross domestic product and cost of light, is found to be
consistent with historical and contemporary data spanning three centuries,
six continents, and seven orders of magnitude. The implication is that, in recent
centuries, the income and price elasticities of demand for artificial light
have been roughly unity. Given that
lighting accounts for 6.5% of world energy consumption and is poised at the brink
of a technology revolution, these elasticities are of great current interest for
forecasting future energy consumption and informing public policy. Some
Simple Physics of Global Warming (Jeff Tsao) (March 2008) (SAND 2008-2255P)
and notes These viewgraphs are
based on a tutorial lecture given for a high school physics class at the Basic Research
Needs in Solid-State Lighting (Julie Phillips, Paul Burrows, Chairs) (October
2006) This report is based on a
U.S. Department of Energy Office of Basic Energy Science’s Workshop on
Solid-State Lighting (SSL), May 22–24, 2006, chaired by Julie Phillips and
Paul Burrows. It examines the gap
separating current state-of-the-art SSL technology from an energy efficient,
high-quality, and economical SSL technology suitable for general
illumination; and identifies the most significant fundamental scientific
challenges and research directions that would enable that gap to be bridged. Solar FAQs (Jeff Tsao,
Nate Lewis, George Crabtree) (SAND 2006-2818P) and related informal talk (SAND 2006-2821P) (April 2006) This white paper asks and
answers a series of questions regarding the potential of the sun to supply
energy to the world. The questions are
drawn in large part from the U.S. Department of Energy Office of Basic Energy
Science’s recent report on Basic Research Needs in Solar Energy
Utilization. The answers are given in
a format suitable for a lay technical audience, and are supplemented by
detailed calculations and comprehensive references. Basic Research Needs in Solar
Energy Utilization (Nate Lewis, George Crabtree, Chairs) (October 2005) This report is based on a
U.S. Department of Energy Office of Basic Energy Science’s Workshop on Solar
Energy Utilization, April 18–21, 2005, chaired by Nate Lewis and George
Crabtree. It examines the challenges
and opportunities for the development of solar energy as a competitive energy
source and identifies the technical barriers to large-scale implementation of
solar energy and the basic research directions showing promise to overcome
them. semiconductor
materials and devices
The
World of Compound Semiconductors This is a book started in
2002, worked on for about a year, then abandoned. Its intent was to have been to provide an integrated
guide to the science, technology and applications of the compound III-V
semiconductors. Its unique aspect was
to have been its emphasis and organization around an objective database (linked file is in procite format) of the most
highly-cited journal articles and Optically-pumped
long-wavelength vertical-cavity surface-emitting laser with high modulation
bandwidth (MV Ramana Murty, D Xu, CC Lin, CL Shieh, JY Tsao, J Cheng,
Appl Phys Lett 86, 061108, 2006) Electrically
pumped long-wavelength VCSEL with air gap DBR and methods of fabrication
(CL Shieh, JY Tsao, US Patent 6,696,308, February 24 2004) Segmented-mirror
VCSEL (JY Tsao, CL Shieh, PD Dapkus, J Yang, US Patent 6,594,294, July 15
2003) Semiconductor
Epitaxy: Science, Technology and Applications 40MB (July-November 1998) (SAND
2007-1800P) This series of twelve
lectures was given over four months at the Materials
Fundamentals of Molecular Beam Epitaxy (Academic Press, 1993) and figures (SAND 2007-1801P) This book gathers
together the basic materials science principles that apply to MBE, and treats
in great depth its most important aspects. Throughout, it makes use of
thermodynamic and statistical calculations based on intuitive and physically
motivated semi-empirical models. |
Solid-State
Lighting
Ultra-Efficient Solid-State Lighting: Performance Frontier,
Progress, Challenges (Jeff Tsao) (Nov 2008) (SAND 2008-7752P) and notes This talk was given at
the 21st Annual Meeting of the IEEE Lasers & Electro-Optics
Society in 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.
International trends in solid state
lighting: analyses of the article and patent literature (
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