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New technology can expand LED lighting, cutting energy use and greenhouse gas emissions
http://www.acs.org/content/acs/en/pressroom/newsreleases/2015/august/white-leds.html[font face=Serif]FOR IMMEDIATE RELEASE | Wed Aug 19 12:44:00 EDT 2015
[font size=5]New technology can expand LED lighting, cutting energy use and greenhouse gas emissions[/font]
[font size=4]Note to journalists: Please report that this research will be presented at a meeting of the American Chemical Society.
A press conference on this topic will be held Wednesday, Aug. 19, at 9 a.m. Eastern time in the Boston Convention & Exhibition Center. Reporters may check-in at Room 153B in person, or watch live on YouTube http://bit.ly/ACSLiveBoston . To ask questions online, sign in with a Google account.[/font]
[font size=3]BOSTON, Aug. 19, 2015 — Highly efficient, light-emitting diodes (LEDs) could slash the world’s electricity consumption. They are already sold in stores, but more widespread adoption of the technology has been hindered by high costs due to limited availability of raw materials and difficulties in achieving acceptable light quality. But researchers will report today that they have overcome these obstacles and have developed a less expensive, more sustainable white LED.
…
To achieve the common, soft white light that consumers expect, current LED technologies typically use a single semiconductor chip to produce light, usually blue, and then rely on a yellow-emitting “phosphor” coating to shift the color to white. That’s because LEDs do not emit a white light. The phosphor is made from materials, such as cerium-doped yttrium aluminum garnet, that are composed of rare-earth elements. These elements are expensive and in limited supply, since they are primarily available only from mining operations outside the U.S. Additionally, the light output of these phosphors tends to be harsh, “cold” colors.
Li’s team is developing hybrid phosphor-based technologies that are much more sustainable, efficient and low-cost. They combine common, earth-abundant metals with organic luminescent molecules to produce phosphors that emit a controllable white light from LEDs. By varying the metal and organic components, the researchers can systematically tune the color of the phosphors to regions of the visible light spectrum that are most acceptable to the human eye, Hu and Li note. The team is continuing to experiment and develop other rare-earth-free LED phosphors based on different metals and organic compounds.
…
Experiments with some materials have shown that the team’s technology can cut LED costs by as much as 90 percent from current methods that rely on rare-earth elements. They have several granted and pending U.S. patents and are exploring manufacturing possibilities.
…[/font][/font]
[font size=5]New technology can expand LED lighting, cutting energy use and greenhouse gas emissions[/font]
[font size=4]Note to journalists: Please report that this research will be presented at a meeting of the American Chemical Society.
A press conference on this topic will be held Wednesday, Aug. 19, at 9 a.m. Eastern time in the Boston Convention & Exhibition Center. Reporters may check-in at Room 153B in person, or watch live on YouTube http://bit.ly/ACSLiveBoston . To ask questions online, sign in with a Google account.[/font]
[font size=3]BOSTON, Aug. 19, 2015 — Highly efficient, light-emitting diodes (LEDs) could slash the world’s electricity consumption. They are already sold in stores, but more widespread adoption of the technology has been hindered by high costs due to limited availability of raw materials and difficulties in achieving acceptable light quality. But researchers will report today that they have overcome these obstacles and have developed a less expensive, more sustainable white LED.
…
To achieve the common, soft white light that consumers expect, current LED technologies typically use a single semiconductor chip to produce light, usually blue, and then rely on a yellow-emitting “phosphor” coating to shift the color to white. That’s because LEDs do not emit a white light. The phosphor is made from materials, such as cerium-doped yttrium aluminum garnet, that are composed of rare-earth elements. These elements are expensive and in limited supply, since they are primarily available only from mining operations outside the U.S. Additionally, the light output of these phosphors tends to be harsh, “cold” colors.
Li’s team is developing hybrid phosphor-based technologies that are much more sustainable, efficient and low-cost. They combine common, earth-abundant metals with organic luminescent molecules to produce phosphors that emit a controllable white light from LEDs. By varying the metal and organic components, the researchers can systematically tune the color of the phosphors to regions of the visible light spectrum that are most acceptable to the human eye, Hu and Li note. The team is continuing to experiment and develop other rare-earth-free LED phosphors based on different metals and organic compounds.
…
Experiments with some materials have shown that the team’s technology can cut LED costs by as much as 90 percent from current methods that rely on rare-earth elements. They have several granted and pending U.S. patents and are exploring manufacturing possibilities.
…[/font][/font]
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