Navigation Links
Cheap and efficient white light LEDs new design described in AIP's Journal of Applied Physics
Date:4/7/2009

s. When an electric current is sent through the wafers, it liberates electrons from the atoms therein, leaving behind vacancies or "holes." When some of the wandering electrons and holes recombine, they create a parcel of light, or photon. These photons emerge from the side of the wafer as visible light. This turns 20 to 50 percent, or even more, of the input energy into light. LEDs also concentrate a lot of light in a small space.

Producing LEDs that can compete with traditional light bulbs for cost and efficiency is one thing. Making LEDs that consumers want to use to light their homes is quite another. One of the main barriers to the widespread use of LED lights is the light itself. LEDs can easily be manufactured to produce light of a single color -- like red -- with applications such as traffic lights and auto brake lights. Indoor lighting though, requires "natural" white light. This quality is measured by the color-rendering index (CRI), which assigns a value based on the light source's ability to reproduce the true color of the object being lit. For reading light, a CRI value of 70 or more is optimal. LEDs can produce white light by combining a mixture of blue, green, and red light, or by sending colored light through a filter or a thin layer of phosphors -- chemicals that glow with several colors when excited. However, these solutions increase costs. To reach a larger market, scientists would like to make inexpensive LEDs that can produce white light on their own.

The authors of this paper report important advances towards this goal. First, they built LEDs from organic, carbon-based materials, like plastic, rather than from more expensive semiconducting materials such as gallium, which also require more complicated manufacturing processes. Second, they demonstrated, for the first time, an organic white-light LED operating within only a single active layer, rather than several sophisticated layers. Moreover, by putting two of these single-l
'/>"/>

Contact: Jason Bardi
jbardi@aip.org
301-209-3091
American Institute of Physics
Source:Eurekalert  

Page: 1 2 3

Related biology news :

1. Cheap love costs the Earth
2. Caltech scientists develop barcode chip for cheap, fast blood tests
3. TGen investigators devise faster, cheaper way of analyzing the human genome
4. New cheaper method for mapping disease genes
5. Substantial improvement in essential cheap solar cell process
6. Pharmaceutical breakthrough may make a range of drugs cheaper and more available
7. Iowa State researchers look for smaller, cheaper, 1-dose vaccines
8. Cheaper drugs now closer to realization with new DropArray technology
9. The power of multiples: Connecting wind farms can make a more reliable - and cheaper - power source
10. Twinkle after-effect can help retinal patients detect vision loss quickly and cheaply
11. Nanotech could make solar energy as easy and cheap as growing grass
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Cheap and efficient white light LEDs new design described in AIP's Journal of Applied Physics
(Date:12/19/2014)... VIEW, Calif. , Dec. 18, 2014  23andMe, ... publication of a study that pinpoints fine-scale differences in ... United States . Since immigrants first ... the United States has served as a ... illuminates how American history and the ongoing mixing of ...
(Date:12/17/2014)... 2014  HITLAB SM announced today its ... to confirm its adherence to current U.S. Food ... HITLAB to conduct regulated smart device and smart ... patient safety and research quality. "HITLAB ... and delivery with innovative technology," said Laura ...
(Date:12/15/2014)... , Dec. 12, 2014 Research and Markets ... addition of the "Global Facial Recognition Market ... http://photos.prnewswire.com/prnh/20130307/600769 Facial ... of individuals. Facial recognition system measures the overall ... jaw edges, mouth, and the distance between eyes. ...
Breaking Biology News(10 mins):23andMe Study Sketches Genetic Portrait of the United States 223andMe Study Sketches Genetic Portrait of the United States 323andMe Study Sketches Genetic Portrait of the United States 4HITLAB Completes GCP Audit for FDA Smart Device & App Compliance 2Global Facial Recognition Market 2015-2019: Key Vendors are 3M Cogent, Cognitec Systems, NEC and Safran Group 2Global Facial Recognition Market 2015-2019: Key Vendors are 3M Cogent, Cognitec Systems, NEC and Safran Group 3
... research was to gather information on the effects of climate ... characteristics of plankton in the estuaries. The author of ... Impact of climate variability on the pelagic ecosystem of two ... time series analysis. He has studied the estuaries from Bilbao ...
... 27, 2009, Rockville, Md. Counterfeit and adulterated food ... detect them emerged as key themes of the Annual ... Convention. Held in Toronto, Canada, more than 300 people ... event. Experts from all countries need to grapple with ...
... The College of Engineering and Science at Louisiana Tech ... Foundation,s ADVANCE program in the amount of $736,500 to ... Success for Women in Engineering and Science." The ... approaches to increasing the representation and advancement of women ...
Cached Biology News:University of Basque Country research study on effects of climate on plankton in the estuaries 2Global public health the focus of scientific conference 2Louisiana Tech University receives grant to advance women in engineering, science 2
(Date:12/24/2014)... 24, 2014   BioLife Solutions , Inc. (NASDAQ: ... marketer of proprietary clinical grade hypothermic storage ... thermal shipping products for cells and tissues  ("BioLife" ... its 2015 Annual Meeting of Stockholders on May 4, ... date for the Annual Meeting represents a change of ...
(Date:12/24/2014)... (PRWEB) December 23, 2014 GMO corn ... biotechnology company, Syngenta, are in the process of being ... The consolidated case is In Re: Syngenta AG MIR ... District Court for the District of Kansas. , Management ... been handed over to U.S. District Judge John W. ...
(Date:12/24/2014)... SoundConnect’s 2015 ... introduce cutting edge communication technology, provide continued ... platform upgrades. This webinar series demonstrates online ... their quest to leverage web conferencing’s most ... SoundConnect’s Marketing Manager, Seanna Baumgartner, “Our webinars ...
(Date:12/24/2014)... Long Island, New York (PRWEB) December 23, 2014 ... , and the Long Island Affiliate of ITRA Global, the ... economy’s slow but steady recovery. This is evidenced by ... and the strong stock market. Low energy costs have ... low. The only negative is the housing market remaining ...
Breaking Biology Technology:BioLife Solutions Sets Date for Annual Meeting of Stockholders 2Carey Danis & Lowe Reports on Syngenta GMO Corn Transfer Order 2SoundConnect Launches Leading Edge Business Communications Webinar Series 2SoundConnect Launches Leading Edge Business Communications Webinar Series 3ITRA Global Reports Long Island Is Out of Sync With The National Office Market 2ITRA Global Reports Long Island Is Out of Sync With The National Office Market 3
... Recent changes with Google , Yahoo , ... location for their ads. , ,In recent months, ... marketers to target specific ad positions within search results; ... and Yahoo announced a partnership with eBay. While the ...
... article, we looked at the leading pharmaceutical companies in the ... for the first time surpassed $600 billion in annual revenues. ... market is the medical device market. , ... device market are not available, it has to have surpassed ...
... Since its inception, Venture Investors has emphasized ... and it now has amassed enough capital to invest ... capital firm announced it has raised $69 million from ... Stage Fund IV Limited Partnership, and already is in ...
Cached Biology Technology:Location, location, location: Spots to consider for online ads 2Location, location, location: Spots to consider for online ads 3Location, location, location: Spots to consider for online ads 4Midwest retains dominant role in 2005 world medical device market 2Midwest retains dominant role in 2005 world medical device market 3Midwest retains dominant role in 2005 world medical device market 4Midwest retains dominant role in 2005 world medical device market 5Midwest retains dominant role in 2005 world medical device market 6Midwest retains dominant role in 2005 world medical device market 7Venture Investors looks to fund 20 companies 2Venture Investors looks to fund 20 companies 3
Anti-rat Dipeptidyl Peptidase IV (DPP IV), CD26, Clone 5E8, Monoclonal Antibody...
JAB1 Immunogen: Synthetic peptide, conjugated to KLH, corresponding to residues S(201) E Y Q T I P L N K I E D F G V(216) of human JAB1. The sequence is identical in mouse and rat. Storage: -...
... The FastPlax Antibody is used to ... on the surface of infected cells as ... the basis of the FastPlax Titer Kit, ... just 25-48 hours. The FastPlax ...
synaptotagmin XIV-like [Source:RefSeq_peptide;Acc:NP_114120] Antigen: Recombinant Protein Epitope Signature Tag (PrEST)....
Biology Products: