Navigation Links
Argonne researcher studies what makes quantum dots blink
Date:10/5/2007

In order to learn more about the origins of quantum dot blinking, researchers from the U.S. Department of Energy's Argonne National Laboratory, the University of Chicago and the California Institute of Technology have developed a method to characterize it on faster time scales than have previously been accessed.

Nanocrystals of semiconductor material, also known as quantum dots, are being intensively investigated for applications such as light-emitting diodes, solid-state lighting, lasers, and solar cells. They are also already being applied as fluorescent labels for biological imaging, providing several advantages over the molecular dyes typically used, including a wider range of emitted colors and much greater stability.

Quantum dots have great promise as light-emitting materials, because the wavelength, or color, of light that the quantum dots give off can be very widely tuned simply by changing the size of the nanoparticles. If a single dot is observed under a microscope, it can be seen to randomly switch between bright and dark states. This flickering, or blinking, behavior has been widely studied, and it has been found that a single dot can blink off for times that can vary between microseconds and several minutes. The causes of the blinking, though, remain the subject of intense study.

The methods developed by Matt Pelton of Argonne's Center for Nanoscale Materials and his team of collaborators has revealed a previously unobserved change in the blinking behavior on time scales less than a few microseconds. This observation is consistent with the predictions of a model for quantum-dot blinking previously developed by Nobel Laureate Rudolph Marcus, contributor to this research, and his co-workers. In this model, the blinking is controlled by the random fluctuation of energy levels in the quantum dot relative to the energies of trap states on the surface of the nanocrystal or in the nearby environment.

The results of
'/>"/>

Contact: Sylvia Carson
scarson@anl.gov
630-252-5510
DOE/Argonne National Laboratory
Source:Eurekalert

Page: 1 2

Related biology technology :

1. NimbleGen researcher to lead $415K DNA project
2. Tapping hidden assets: Wisconsin researchers who can create jobs
3. Genomics researcher Hood joins NimbleGen board
4. Researcher wants to commercialize adult stem cell discovery
5. National Academies induct five UW researchers
6. Wisconsin researchers defend stem cell company
7. Departure of nanotech researcher stings UW
8. Medical College researcher working to make genetic-based medicine a reality
9. NimbleGen partners with leading researchers
10. Medical College researchers win federal grants
11. Researchers say scientific reporting needs more perspective, less hype
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:9/16/2014)... a deicing film for radar domes have now refined ... glass. , The new work by Rice chemist ... from windshields to skyscrapers free of ice and fog ... , The technology was introduced this month in the ... . , The material is made of graphene ...
(Date:9/16/2014)... CIRTEC Medical Systems’ Board of Directors has ... CIRTEC. , “I am delighted to be joining ... Brian Highley. “The company has made great strides improving ... over the past two years. The goal now is ... expand the services Cirtec offers its medical device customers.” ...
(Date:9/16/2014)... 16, 2014 Convoy Therapeutics, Inc., ... effective products to treat patients directly at the ... proprietary SPACE™ Technology Platform announced today that John ... present at the White Hat Life Science Investor ... Regency Phoenix. In addition, interested individuals can ...
(Date:9/16/2014)... NEW ORLEANS , Sept. 16, 2014 ... Austin, Texas -based cybersecurity company focused on ... 2FA ONE, will support the ability to generate a ... As a pioneer of user-based RFID authentication, ... used for physical access, for many years. RFID authentication ...
Breaking Biology Technology:Nanoribbon film keeps glass ice-free 2Convoy Therapeutics to Present at WhiteHat Investor Conference September 18, 2014 2Convoy Therapeutics to Present at WhiteHat Investor Conference September 18, 2014 32FA, Inc. Announces RFID-based One-Time Password (OTP) Authentication 2
... New England Biolabs has expanded its line of PCR ... Hot Start DNA Polymerases. Optimized blends of Taq ... offer robust amplification across a wide range of templates, including ... Deep Vent increases the fidelity and robustness of Taq ...
... PARK, N.C., Feb. 14, 2011 India,s premier ... Neurological Society of India & Congress of Neurological ... December.  The event was a convergence of leading ... from across the globe to discuss advances made ...
... Va., Feb. 14, 2011 Technology Catalysts International (TCI), ... research on trends and development in drug delivery have ... drugs with limited patent life, a different pathway for ... product a competitive edge in a crowded pharmaceutical field. ...
Cached Biology Technology:New England Biolabs Introduces OneTaq™ DNA Polymerase, a Robust Solution for Routine and Difficult PCR 2Max Neeman International Initiates Advisory Committee to Advance and Improve the Conduct of Complex Neurological Trials in India 2Parenteral Depots Offer $8 Billion of Reformulation Opportunities and a Strong Competitive Edge in Crowded Pharmaceutical Space 2
(Date:9/17/2014)... MSSA could be curbed by coating hospital surfaces ... of shark skin, according to research published in ... Infection Control . , The study modelled how ... disease bacteria through touching, sneezes or spillages. The ... formulated to resemble shark skin. The study showed ...
(Date:9/16/2014)... 2014)More than $100 trillion in cumulative public and ... dioxide (CO2)a 40 percent reduction of urban passenger ... world expands public transportation, walking and cycling in ... the University of California, Davis, and the Institute ... Further, an estimated 1.4 million early deaths could ...
(Date:9/16/2014)... viruses that make us sick can take up residence ... sneeze, cough or other troublesome symptom, according to new ... Louis. , On average, healthy individuals carry about ... report online in BioMed Central Biology . The ... diversity of viruses in healthy people. , The ...
Breaking Biology News(10 mins):Sharks' skin has teeth in the fight against hospital superbugs 2Global shift away from cars saves US$100 trillion, eliminates 1,700 MT of CO2 pollution 2Global shift away from cars saves US$100 trillion, eliminates 1,700 MT of CO2 pollution 3Global shift away from cars saves US$100 trillion, eliminates 1,700 MT of CO2 pollution 4Global shift away from cars saves US$100 trillion, eliminates 1,700 MT of CO2 pollution 5Healthy humans make nice homes for viruses 2Healthy humans make nice homes for viruses 3
... While newly published research confirms that under laboratory circumstances prion-protein ... this is unlikely to occur in real life. In addition, ... do take up these disease-associated proteins are different from the ... will be published in the Journal of Pathology. , Since ...
... & Science University researchers gather a princely sum of ... , Scientists in the OHSU School of Medicine's ... to report a new approach using eggs of the ... Xenopus laevis, to understand how the Fanconi anemia proteins ...
... mixing of pasta metaphors, Pacific Northwest National Laboratory ... biological molecules lasagna-like around spaghetti-like carbon nanotubes. ... of applications, from ultra-precise blood-sugar monitoring to infectious-agent ... at the Department of Energy campus' W.R. Wiley ...
Cached Biology News:New evidence questions the simple link between prion proteins and madcow disease 2New evidence questions the simple link between prion proteins and madcow disease 3Clawed frog helps Fanconi anemia research make leaps 2Clawed frog helps Fanconi anemia research make leaps 3A biosensor layered like lasagna 2
Thermo Forma provides an array of accessory Racks for the Cryo/CryoPlus 16" Diameter storage system. To maximise inventory capacity a Jumbo Arrowhead configuration is recommended. You may choose betw...
... shakers combine high durability and capacity with ... heavy-duty mechanism prevents vibration, allowing the unit ... Every other part, from the large rubber ... machined aluminum platform is designed to last ...
The Holten Horizontal series of laminar airflow work benches offers comfort and ease of use....
... Forma Incubated Orbital Shakers combine ... temperature performance and ease of use. ... vibration, allowing the unit to run ... loads. The unit's class-leading temperature range ...
Biology Products: