Navigation Links
UGA researchers invent new material for warm-white LEDs
Date:1/18/2013

Athens, Ga. Light emitting diodes, more commonly called LEDs, are known for their energy efficiency and durability, but the bluish, cold light of current white LEDs has precluded their widespread use for indoor lighting.

Now, University of Georgia scientists have fabricated what is thought to be the world's first LED that emits a warm white light using a single light emitting material, or phosphor, with a single emitting center for illumination. The material is described in detail in the current edition of the Nature Publishing Group journal "Light: Science and Applications."

"Right now, white LEDs are mainly used in flashlights and in automotive lamps, but they give off a bluish, cool light that people tend to dislike, especially in indoor lighting," said senior author Zhengwei Pan, an associate professor in the department of physics in the UGA Franklin College of Arts and Sciences and in the College of Engineering. "Our material achieves a warm color temperature while at the same time giving highly accurate color rendition, which is something no single-phosphor-converted LED has ever been shown to do."

Two main variables are used to assess the quality of artificial light, Pan explained. Correlated color temperature measures the coolness or warmth of a light, and temperatures of less than 4,000 kelvins are ideal for indoor lighting. Correlated color temperatures above 5,000 kelvins, on the other hand, give off the bluish color that white LEDs are known for. The other important measure, color rendition, is the ability of a light source to replicate natural light. A value of more than 80 is ideal for indoor lighting, with lower values resulting in colors that don't seem true to life.

The material that Pan and his colleagues fabricated meets both thresholds, with a correlated color temperature of less than 4,000 kelvins and a color rendering index of 85.

Warm white light can commonly be achieved with a blue
'/>"/>

Contact: Zhengwei Pan
panz@uga.edu
706-542-4657
University of Georgia
Source:Eurekalert

Page: 1 2 3

Related biology news :

1. Study by UC Santa Barbara researchers suggests that bacteria communicate by touch
2. UC Santa Barbara researchers discover genetic link between visual pathways of hydras and humans
3. Researchers attempt to solve problems of antibiotic resistance and bee deaths in one
4. UNH researchers find African farmers need better climate change data to improve farming practices
5. Ottawa researchers to lead world-first clinical trial of stem cell therapy for septic shock
6. Researchers uncover molecular pathway through which common yeast becomes fungal pathogen
7. Researchers print live cells with a standard inkjet printer
8. Columbia Engineering and Penn researchers increase speed of single-molecule measurements
9. Researchers reveal how a single gene mutation leads to uncontrolled obesity
10. Researchers discover novel therapy for Crohns disease
11. New paper by Notre Dame researchers describes method for cleaning up nuclear waste
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:4/27/2015)... April 27, 2015  For more than four decades, ... has been the premier worldwide event for the unmanned ... a must-attend event for any local, national, or trade ... emerging commercial markets and current applications of unmanned technologies. ... this projected $48 billion industry, and how it will ...
(Date:4/27/2015)... -- NXT-ID, Inc. (NASDAQ: NXTD ) ("NXT-ID" or ... growing mobile commerce market, announces that its Wocket® Smart ... week of May, 2015 and will be fulfilling all ... Gino Pereira , Chief Executive Officer said, ... Wocket® enters the consumer market. We would like to ...
(Date:4/27/2015)... LAUDERDALE, Fla. , Apr. 27, 2015 ... of access control and security systems is pleased to ... the company as a consultant and member of its ... is widely known as a thought leader in ... Distance Learning Technology Group, and has published studies and ...
Breaking Biology News(10 mins):UNMANNED SYSTEMS 2015: Largest International Conference and Trade Show for the Drone and Unmanned Technology Industry 2UNMANNED SYSTEMS 2015: Largest International Conference and Trade Show for the Drone and Unmanned Technology Industry 3UNMANNED SYSTEMS 2015: Largest International Conference and Trade Show for the Drone and Unmanned Technology Industry 4UNMANNED SYSTEMS 2015: Largest International Conference and Trade Show for the Drone and Unmanned Technology Industry 5Wocket, the Smartest Wallet You Will Ever Own, Announces Shipment to Pre-order Customers 2Wocket, the Smartest Wallet You Will Ever Own, Announces Shipment to Pre-order Customers 3Profile Solutions Names Medicinal Cannabis, Agriculture and Technology Expert Dr. Gerry Bedore to its Scientific Advisory Board 2Profile Solutions Names Medicinal Cannabis, Agriculture and Technology Expert Dr. Gerry Bedore to its Scientific Advisory Board 3Profile Solutions Names Medicinal Cannabis, Agriculture and Technology Expert Dr. Gerry Bedore to its Scientific Advisory Board 4
... learning to swim? Thrashing around, floundering, until suddenly it ... of doggy-paddle propel you away from your parent's arms. ... swimmers. Actually, fish larvae are pretty feeble when it ... Dr Ulrike Müller from Wageningen University studies how fish ...
... breast cancer is the lack of inexpensive, early detection ... Michigan hope to change that by developing a device ... with breast cancer. The team won a Breast Cancer ... reward research proposals that could lead to critical advancements ...
... show that regular use of popular prescription pain relievers may ... percent and may offer similar benefit in the prevention of ... were released today at the annual meeting of the American ... believe this is the first study to show that selective ...
Cached Biology News:Even fish don't swim well when they're young! 2Researchers win money to develop breath test to detect breast cancer 2COX-2 inhibitors significantly reduce risk of cancer 2
(Date:5/1/2015)... RESEARCH TRIANGLE PARK, N.C. , May 1, 2015 ... that Roger Jeffs , Ph.D., President and Co-Chief Executive ... on the company,s business at the Deutsche Bank 40 th ... . The presentation will take place on ... can be accessed via a live webcast on the United ...
(Date:4/30/2015)... 30, 2015   Tamir Biotechnology , a leading ... on its Ebola antiviral therapy program. ... is currently being evaluated and considered by a number ... Ebola. During the first quarter of 2015, the company ... Accelerate The Evaluation of Potential Treatments and Vaccines For ...
(Date:4/30/2015)... Nitto Avecia, a leading biotechnology manufacturer ... and production capability to serve biotechnology pharmaceutical clients. ... fulfillment continues to drive Nitto Avecia to enhance ... , In Fall 2014, Nitto Avecia ... at its Milford, MA facility, which is recognized ...
(Date:4/30/2015)... Cambridge, MA & Budapest, Hungary (PRWEB) April 30, ... the only web-based electronic lab notebook with integrated ... leader in providing chemistry software solutions and consulting ... that led to the development of Labguru’s newest ... a set of deep domain features for biologists, ...
Breaking Biology Technology:Tamir Biotechnology Provides Update on TMR004 Development Against Mutating Ebola 2Tamir Biotechnology Provides Update on TMR004 Development Against Mutating Ebola 3Tamir Biotechnology Provides Update on TMR004 Development Against Mutating Ebola 4Biotechnology Manufacturer Nitto Avecia Expands Capacity to Meet Client Demand 2Labguru Integrates ChemAxon's Marvin JS, to Enhance Functionality for Chemists 2
... , the banking and payments technology subsidiary of ... online loan software to the federally chartered savings institution, ... more than four million customers and over $62 billion ... for its wholesale mortgage operation, ING Mortgage. , ...
... Healthcare has been informed that its stock will continue to ... but the company does not know how long its reprieve will ... to continue the listing of Merge's common stock despite the company's ... its annual report for the fiscal year ended December 31, 2005, ...
... the $15 billion unit of General Electric Company ... (TGen), a not-for-profit research institute based in Phoenix, ... development. , ,The alliance is designed to apply advanced ... a field that applies knowledge from the Human Genome ...
Cached Biology Technology:GE Healthcare partners with genomics institute 2
Protein YIPF6 (YIP1 family member 6). [Source:Uniprot/SWISSPROT;Acc:Q96EC8] Antigen: Recombinant Protein Epitope Signature Tag (PrEST)....
... Serum; U.S. sourced, ideal for ... quality; Low hemoglobin; Endotoxin: < ... of US origin; U.S. sourced, ... an uncompromising quality. Low hemoglobin ...
Chicken polyclonal to ytzF ( Abpromise for all tested applications). Antigen: Full length protein...
Fetal Calf Serum Replacement (Bistec) serum...
Biology Products: