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:1/23/2015)... 2015 Biofertilizers stimulate microbial activities in ... and phosphorous through the activities in the soil or ... due to the stress on reducing environmental pollution and ... report defines and segments the bio fertilizers market with ...
(Date:1/22/2015)... Md. (PRWEB) January 22, 2015 ... its new UV-1280 multipurpose UV-visible spectrophotometer. Offering wavelength ... high-quality instrument is ideal for applications in a ... life science. , The user-friendly UV-1280 enables intuitive ...
(Date:1/22/2015)... (PRWEB) January 21, 2015 Cambridge Semantics, the ... technology, today announced that 2014 was a record-breaking year across ... capabilities of the Anzo Smart Data Platform and our Smart ... utilize insights from diverse data which led to record growth ...
(Date:1/22/2015)... 22, 2015 Pipette.com has added the ... their comprehensive portfolio of Eppendorf products. , The Eppendorf ... a Centrifuge 5424/5424 R and receive the following:, ... Research plus or Eppendorf Reference 2 , ...
Breaking Biology Technology:Biofertilizers Market Expected to Reach $1,649.7 Million by 2019 - New Report By MarketsandMarkets 2Biofertilizers Market Expected to Reach $1,649.7 Million by 2019 - New Report By MarketsandMarkets 3Biofertilizers Market Expected to Reach $1,649.7 Million by 2019 - New Report By MarketsandMarkets 4Shimadzu’s New Monitored Single-Beam UV-Vis Spectrophotometer Offers Comprehensive Measurement Options in a Compact Body 2Cambridge Semantics Announces Record Results for 2014 2Eppendorf Announces Promotional Bundle Which Includes: Eppendorf Centrifuge 5424, 3-Pack of Pipettes, and Tips - Available Now at Pipette.com 2
... WASHINGTON, Oct. 1 Today a promising young,scholar ... Mexico, accepted,the Manuel Velasco-Suarez Award in Bioethics for ... field of bioethics in Latin America during,the 27th ... Naftolin, a trustee of the Pan American Health ...
... Quarter 2007 Earnings Conference Call Thursday, November 8, 2007, ... 5:00 p.m. U.S. EST, FRAZER, Pa., Oct. 1 ... for 5:00 p.m. EST on Thursday, November 8, 2007. ... November 8, 2007 Schedule, 4:30 p.m. EST Q3 2007 results ...
... Oct. 1 A highly sensitive, easy-to-use,test that ... as the Best New Veterinary Product for Diagnostics ... time PCR test was selected for its,excellence and ... the global community of animal sciences practitioners and,professionals. ...
Cached Biology Technology:Prestigious Bioethics Award for Scholar from Mexico 2BoVir(R) Named Best New Veterinary Diagnostics Product in International Animal Pharm Awards 2BoVir(R) Named Best New Veterinary Diagnostics Product in International Animal Pharm Awards 3
(Date:12/11/2014)... , Dec. 10, 2014  That blood pressure plays a ... while. Hypertension – the medical term for high blood pressure ... 1800s, and the inflatable cuff that,s used in measuring blood ... mean there,s nothing new about hypertension, its triggers and its ...
(Date:12/10/2014)... 2014 You,ve been here before: you desperately need to sign ... key or the answer to your secret question. What,s your dog,s ... Hoyos Labs , a digital infrastructure security company, launches ... frustration that comes with usernames, passwords and PINs – 1U ...
(Date:12/10/2014)... WINSTON-SALEM, N.C. , Dec. 9, 2014  Wake Forest Baptist ... building for its School of Medicine. Funding for this $50 ... that will be publicly launched next summer. ... 60 series R.J. Reynolds Tobacco Company complex, adjacent to 525@vine ...
Breaking Biology News(10 mins):Research points to need for new approaches to treatment of high blood pressure 2Research points to need for new approaches to treatment of high blood pressure 3Research points to need for new approaches to treatment of high blood pressure 4The Password is Finally Dead: Launch of 1U Mobile App Eliminates Need for All Usernames and Passwords 2The Password is Finally Dead: Launch of 1U Mobile App Eliminates Need for All Usernames and Passwords 3Wake Forest Baptist to Build New Medical Education Facility In Wake Forest Innovation Quarter 2Wake Forest Baptist to Build New Medical Education Facility In Wake Forest Innovation Quarter 3Wake Forest Baptist to Build New Medical Education Facility In Wake Forest Innovation Quarter 4
... field of schizophrenia research has come alive with many ... introduction of chlorpromazine to the current day, all treatments ... had, at their core, a single treatment mechanism, the ... of clozapine in the 1980s suggested a potential that ...
... Loss of a small portion of chromosome 16, known ... from the University of Chicago Medical Center, the University ... Institute in an article, published Dec. 21, 2007, online ... this genetic "microdeletion" occurred in only four out of ...
... Dr. McWhorter Joins Olive, Edwards & Cooper with Technical, Products ... ... Edwards & Cooper,announced the addition of Dr. David McWhorter as a ... expand into the,homeland security marketplace. His immediate focus will be ensuring ...
Cached Biology News:New treatment mechanisms for schizophrenia 2New treatment mechanisms for schizophrenia 3Recurrent genetic deletion linked to autism 2Chemist Brings SAFETY Act Expertise to Homeland Security Firm 2
BD FastImmune EDTA Solution. Applications: Flow Cytometry Storage Temperature: Refrigerate(2 to 8C)...
Autoclavable, variable volumefitted w./ an anti-drip safety valve; borosilicate glass barrelprotected with transparentpolypropylene sleeve; spring-lock cursor design ensuresfine adjustment for exact ...
...
... Detection Platform combines robust chemistry with ... sensitive, specific, and cost-effective detection method ... Platform offers exceptional performance with specificity ... high signal/background ratio, and an expanded ...
Biology Products: