Navigation Links
In new quantum-dot LED design, researchers turn troublesome molecules to their advantage
Date:11/15/2011

Cambridge, Mass. November 15, 2011 By nestling quantum dots in an insulating egg-crate structure, researchers at the Harvard School of Engineering and Applied Sciences (SEAS) have demonstrated a robust new architecture for quantum-dot light-emitting devices (QD-LEDs).

Quantum dots are very tiny crystals that glow with bright, rich colors when stimulated by an electric current. QD-LEDs are expected to find applications in television and computer screens, general light sources, and lasers.

Previous work in the field had been complicated by organic molecules called ligands that dangle from the surface of the quantum dots. The ligands play an essential role in quantum dot formation, but they can cause functional problems later on.

Thanks to an inventive change in technique devised by the Harvard team, the once-troublesome ligands can now be used to build a more versatile QD-LED structure. The new single-layer design, described in the journal Advanced Materials, can withstand the use of chemical treatments to optimize the device's performance for diverse applications.

"With quantum dots, the chemical environment that's optimal for growth is usually not the environment that's optimal for function," says co-principal investigator Venkatesh Narayanamurti, Benjamin Peirce Professor of Technology and Public Policy at SEAS.

The quantum dots, each only 6 nanometers in diameter, are grown in a solution that glows strikingly under a black light.

The solution of quantum dots can be deposited onto the surface of the electrodes using a range of techniques, but according to lead author Edward Likovich (A.B. '06, S.M. '08, Ph.D. '11), who conducted the research as a doctoral candidate in applied physics at SEAS, "That's when it gets complicated."

"The core of the dots is a perfect lattice of semiconductor material, but on the exterior it's a lot messier," he says. "The dots are coated with ligands, long organic chai
'/>"/>

Contact: Caroline Perry
cperry@seas.harvard.edu
617-496-1351
Harvard University
Source:Eurekalert

Page: 1 2 3

Related biology technology :

1. National Ergonomics Expo Sees 86% On-Site Exhibitor Renewal Rate for 2009; New Products from Contour Design, Equipois, Goldtouch and Herman Miller Win 2008 NECE Attendees Choice New Product Awards
2. Sanofi Pasteur to Acquire VaxDesign, a U.S. Biotechnology Company
3. Understanding the science of solar-based energy: more researchers are better than one
4. Researchers decode viral process that prepares cells for HIV infection
5. Dartmouth researchers advance cellulosic ethanol production
6. Researchers develop new model for cystic fibrosis
7. Use it or lose it? Researchers investigate the dispensability of our DNA
8. Sigma-Aldrich and the University of Illinois Offer New Boronic Acid Surrogates to Researchers Worldwide Through Licensing Agreement
9. Researchers write protein nanoarrays using a fountain pen and electric fields
10. Researchers show how to stamp nanodevices with rubber molds
11. The Lancets New Online Medical Journal Helps Clinicians and Medical Researchers Find Practice-Changing Evidence Quickly and Easily
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:9/19/2014)... SPRINGS, Florida , September 19, 2014 ... companies release latest developments, patents and results of studies ... GNSZ), Eli Lilly and Company (NYSE: LLY ... Celgene Corporation (NASDAQ: CELG ) and Arena ... GNSZ), a leader in developing prodrug therapeutics for the ...
(Date:9/19/2014)... 2014 , The first grants ... Paediatric Endocrinology (ESPE) Meeting  Investment supports innovative ... in the field of growth  , EMD ... Germany , today announced the first recipients of ... awards were announced during a Satellite Symposium organized by ...
(Date:9/18/2014)... LONDON , Sept. 18, 2014 ... near-patient testing, is performed outside a clinical laboratory. ... hence in administrating appropriate treatments and medication. POCT ... and prevalence of lifestyle diseases such as diabetes, ... and user-friendly. POCT devices are standardized to minimize ...
(Date:9/18/2014)... DUBLIN, Ireland , September 18, ... ,Research and Markets ( http://www.researchandmarkets.com/research/czvg3s/biocompatible ) ... "Biocompatible Materials - Global Strategic ... offering. ,     (Logo: http://photos.prnewswire.com/prnh/20130307/600769) ,This report ... Materials in US$ Million by the ...
Breaking Biology Technology:Biotech Companies Pushing Sector Higher With Recent Therapeutic Advancements & Patent Approvals - Company Wins Summary Judgment For Prodrug Patent 2Biotech Companies Pushing Sector Higher With Recent Therapeutic Advancements & Patent Approvals - Company Wins Summary Judgment For Prodrug Patent 3Biotech Companies Pushing Sector Higher With Recent Therapeutic Advancements & Patent Approvals - Company Wins Summary Judgment For Prodrug Patent 4Biotech Companies Pushing Sector Higher With Recent Therapeutic Advancements & Patent Approvals - Company Wins Summary Judgment For Prodrug Patent 5Biotech Companies Pushing Sector Higher With Recent Therapeutic Advancements & Patent Approvals - Company Wins Summary Judgment For Prodrug Patent 6Biotech Companies Pushing Sector Higher With Recent Therapeutic Advancements & Patent Approvals - Company Wins Summary Judgment For Prodrug Patent 7EMD Serono Awards Grant for Growth Innovation (GGI) for the First Time 2EMD Serono Awards Grant for Growth Innovation (GGI) for the First Time 3POCT Market in China 2014-2018 2Biocompatible Materials - Global Strategic Business Report 2014 2Biocompatible Materials - Global Strategic Business Report 2014 3
... , , CLEVELAND, Sept. 9 ... for ways to drive out costs and inefficiencies. Because it,s proven ... documents that go along with them, many are turning to enterprise ... the roadblock: budgets are tighter than ever, so how do these ...
... , , THE WOODLANDS, Texas, Sept. ... LXRX ), a biopharmaceutical company focused on discovering and developing breakthrough treatments ... Ph.D. , Lexicon,s president and chief executive officer, will present at ... in New York, New York on Tuesday, September 15, 2009 at 1:35 ...
... BRIDGEWATER, England, September 9 Clinical Therapeutics,(, http://www.clinicaltherapeutics.com/ ... announce the addition of Michael G. Spigarelli, MD, ... As section editor for the Pediatric, ... the,Pediatric Research section), Dr. Spigarelli brings a wealth ...
Cached Biology Technology:Hyland Software Provides Grant Assistance to Kick-Start Technology Projects 2Hyland Software Provides Grant Assistance to Kick-Start Technology Projects 3Hyland Software Provides Grant Assistance to Kick-Start Technology Projects 4Lexicon Pharmaceuticals to Present at the Morgan Stanley Global Healthcare Unplugged Conference 2Clinical Therapeutics Announces the Addition of Michael G. Spigarelli, MD, PhD, as Editor for a Refocused Pediatric, Adolescent, & Maternal Therapeutics Section 2
(Date:9/19/2014)... species which over thousands of years has adapted to the ... that makes the cold dangerous for you. , This is ... and the cold provoking substance, called nonylphenol, comes from the ... suspected of being a endocrine disruptor, but when entering the ... ability to protect the cells in its body from cold ...
(Date:9/18/2014)... Boulder, Colo., USA A new GSA Bulletin ... along the lower Rio Puerco and Chaco Wash in ... tree rings from salt cedar and willow, investigators were ... thick or greater. They then combined this data with ... reconstruct the history of these arroyos. , Arroyos are ...
(Date:9/18/2014)... A novel robotic system that can operate inside the ... as part of a biomedical research partnership program at ... of determining if the robot, in conjunction with real-time ... accurate, less costly, and less discomforting for the patient. ... prostate cancer therapies with greater precision. , Developed by ...
Breaking Biology News(10 mins):Environmental pollutants make worms susceptible to cold 2Environmental pollutants make worms susceptible to cold 3Tree rings and arroyos 2Tree rings and arroyos 3Tree rings and arroyos 4Tree rings and arroyos 5Tree rings and arroyos 6Tree rings and arroyos 7Trial begins for MRI-compatible robot designed to improve accuracy of prostate biopsies 2Trial begins for MRI-compatible robot designed to improve accuracy of prostate biopsies 3Trial begins for MRI-compatible robot designed to improve accuracy of prostate biopsies 4Trial begins for MRI-compatible robot designed to improve accuracy of prostate biopsies 5
... the Sundarbans, resulting in as much as 200m of coast ... (11th Jan) in Remote Sensing by scientists from ... development thrives, and global temperature continues to rise, natural protection ... rates. This will inevitably lead to species loss in this ...
... W. Finberg, MD, the Richard M. Haidack Professor of ... University of Massachusetts Medical School, is lead investigator on ... predicting how the influenza virus changes and evolves in ... This approach has promise for becoming a pivotal tool ...
... cells can be grown on biocompatible scaffolds to form ... repair and regeneration of damaged or diseased tissue. However, ... a specific pattern or alignment. An innovative method for ... tissue architectures is described in an article in ...
Cached Biology News:Bengali forests are fading away 2
...
Human Presenilin-2 NTF Affinity Purified Polyclonal Ab...
2'-Fluorine-CTP (2'-F-CTP) is readily incorporated into transcripts by T7 and SP6 R&DNA™ Polymerase and is available separately....
Human Glypican 2 Biotinylated Affinity Purified PAb...
Biology Products: