[EAS]Solid State Lighting

[pjk]

Subject:   Solid State Lighting

With Prof. Jerry Woodall, of Yale's Electrical Engineering Department,
having recently been awarded the National Medal of Technology (by
President Bush at the White House) for his pivotal contributions to
solid-state opto-electronic technology, this seems a particularly apt
item for this list.  --PJK

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from
The NSDL Scout Report for Math, Engineering, and Technology
October 25, 2002
Volume 1, Number 19
http://scout.cs.wisc.edu/nsdl-reports/met/2002/met-021025.html

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Solid-State Lighting

1. Solid-State Lighting [.pdf]
http://www.lrc.rpi.edu/solidstate/index.htm

2. High Brightness LEDs
http://www.compoundsemi.com/hbled/

3. Visible LEDs: The Trend toward High Power Emitters and Remaining Challenges for Solid State Lighting
http://ncem.lbl.gov/team/presentations/Craford/index.htm

4. Energy.gov: Secretarial Speeches
http://www.energy.gov/HQDocs/speeches/2002/junss/13thAnnualEnergyEfficiencyForum.html

5. Vision 2020: The Lighting Technology Roadmap [.pdf]
http://www.eren.doe.gov/buildings/vision2020/

6. Illumination with Solid State Lighting Technology [.pdf]
http://www.lumileds.com/pdfs/techpaperspres/STEIGERWALD.PDF

7. Cool Tungsten Light Bulb in Future?
http://www.lighting.com/index.taf?_UserReference=7AE35DE9B4C882133D9389EA&_sn=content&_pn=story&_op=409

8. Silicon Strategies: Kopin Maintains LED Brightness at Reduced Voltage
http://www.siliconstrategies.com/story/OEG20020729S0003

Solid-state lighting is a revolutionary technology that uses
semiconducting materials to create light while generating almost no
heat. This is extremely energy efficient, but until recently has been
impractical due to the small amount of light emitted. New developments
in light-emitting diodes (LEDs) have reversed this trend, and strong
interest has been shown by the US government and many research bodies.

A good introduction to the technology can be found at the Lighting
Research Center (1). It has a few presentations that demonstrate the
implications of solid-state lighting, as well as highlights of various
research projects. The Compound Semiconductors Web site (2) is a good
news source to learn about current breakthroughs. Abstracts of
tutorials and industry outlooks are provided, which describe pure
white light LEDs and other emerging technologies. Lawrence Berkeley
National Laboratory has a significant research effort in solid state
lighting. This presentation (3), given in August 2002, describes the
lab's motivation for advancing the technology. In a speech given by US
Secretary of Energy Spencer Abraham (4), he emphasizes the importance
of solid-state lighting to reduce electricity usage. He describes the
relationship between LEDs and conventional fluorescent lighting as
similar to that between transistors and vacuum tubes. The Office of
Building Technology offers this roadmap of lighting technology (5).
The report anticipates advances in the industry over the next twenty
years, with specific attention to solid state lighting. Another report
is from the IEEE Journal on Selected Topics in Quantum Electronics
(6). The authors discuss current trends in high-power LED development
and results of the first solid-state lamp that is as intense as Thomas
Edison's twenty watt bulb. A recent accomplishment at Sandia National
Laboratories is outlined in this article from Lighting.com (7). The
"tungsten photonic lattice" is capable of converting heat to visible
light and could improve electrical efficiency by over 50 percent.
Another efficiency-related news story comes from researchers from a
semiconductor company and North Carolina State University (8). Their
product reduces the voltage of a high-brightness LED to less than
three volts, which was a long standing scientific hurdle.