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:7/29/2015)... July 29, 2015 /PRNewswire/ - BioAmber Inc. (NYSE: BIOA ... Company,s Chief Financial Officer has resigned.  The Company has ... Officer who retired in December 2014, as full time ... permanent successor.     Andy Ashworth began ... ensure a smooth transition.  Andy was the Company,s CFO ...
(Date:7/29/2015)... 2015 Research and ... of the "Global Biosimilars Market, 2015 - ... The Global Biosimilars Market, 2015 - 2025, report ... biosimilars market. With the blockbuster biologics losing patent ... biosimilars are being viewed as viable substitutes to ...
(Date:7/29/2015)... July 29, 2015  Pfenex Inc. (NYSE MKT: PFNX) ... will be released on Thursday, August 13, 2015, before ... Pfenex management will host a conference call to discuss ... press release outlining the financial results and business update ... Please call 1-866-376-8058 (US) or 1-412-542-4131 (international) and ...
(Date:7/29/2015)... 2015 /PRNewswire/ - Aeterna Zentaris Inc. (NASDAQ: AEZS ... an optimized Erk inhibitor molecule for development, thus ... a new class of potential cancer therapies. ... target for therapeutic intervention in cancer. Recently approved ... for B-Raf and Mek inhibitors. Erk inhibitors may ...
Breaking Biology Technology:BioAmber Announces Change in Chief Financial Officer 2BioAmber Announces Change in Chief Financial Officer 3Global Biosimilars Market to 2025: Monoclonal Antibodies (mAbs), Insulin, Interferons, G-CSF/ GM-CSF, Erythropoietins and Others 2Global Biosimilars Market to 2025: Monoclonal Antibodies (mAbs), Insulin, Interferons, G-CSF/ GM-CSF, Erythropoietins and Others 3Pfenex To Report Second Quarter 2015 Results and Provide Business Update on Thursday, August 13, 2015 2Aeterna Zentaris Announces Optimized Erk Inhibitor Compounds For Further Development 2Aeterna Zentaris Announces Optimized Erk Inhibitor Compounds For Further Development 3
... on Form 20-F/A -- HONG KONG, Oct. 20 /PRNewswire-Asia-FirstCall/ -- ... ... if (typeof(lpUnit)==,undefined,) var lpUnit=,PRN,; --> ... { var s = ,; var first_result; // Results are keyed by longUrl, so we need to grab the ...
... Silence Therapeutics plc (AIM: SLN) ("Silence" or the "Company") ... a new patent that provides broad protection on novel ... the "Zamore Design Rules."  European patent number 1 633 ... and Specificity of RNAi" was published today in the ...
... The Cold Triple Axis spectrometer, a new addition to ... a complementary tool to other neutron scattering instruments at ... uses "cold" neutrons from the HFIR cold source to ... slower than their "thermal" neutron counterparts, and thus perfect ...
Cached Biology Technology:China Cord Blood Corporation Files Its Annual Report on Form 20-F/A 2China Cord Blood Corporation Files Its Annual Report on Form 20-F/A 3China Cord Blood Corporation Files Its Annual Report on Form 20-F/A 4China Cord Blood Corporation Files Its Annual Report on Form 20-F/A 5China Cord Blood Corporation Files Its Annual Report on Form 20-F/A 6China Cord Blood Corporation Files Its Annual Report on Form 20-F/A 7China Cord Blood Corporation Files Its Annual Report on Form 20-F/A 8Silence Therapeutics Receives Comprehensive Protection for RNAi Structural Modification Technology in Single European Patent 2Silence Therapeutics Receives Comprehensive Protection for RNAi Structural Modification Technology in Single European Patent 3ORNL's research reactor revamps veteran neutron scattering tool 2
(Date:7/20/2015)... 20, 2015  Acuity Market Intelligence,s latest research ... of Commerce and Privacy" forecasts that between 2014 ... will be downloaded to smart mobile devices by ... market is projected to generate more than $67.9 ... seven-year forecast period.    "Biometrics is ...
(Date:7/13/2015)... 13, 2015 NXT-ID, Inc. (NASDAQ: NXTD ... company focused on the growing mobile commerce market, ... 62/188684 for BEHAVIORAL-DIRECTED AUTHENTIATION METHOD AND ... and secure method to make payments.  With this ... introduced with its groundbreaking voice-direct payment patent application, ...
(Date:7/9/2015)... , July 07, 2015 ... announced the addition of the "Biometrics for ... Forecasts 2015-2020" report to their offering. ... major contributor to this growth and the forecast ... billion in revenue for companies involved in delivering ...
Breaking Biology News(10 mins):Biometrics on Smart Mobile Devices to Redefine Digital Identity with 12.9 Billion Biometric App Downloads between 2014 and 2020 2NXT-ID Patents Behavior-Directed Payments 2NXT-ID Patents Behavior-Directed Payments 3NXT-ID Patents Behavior-Directed Payments 4Global Banking Biometrics Market 2015-2020 - Market & Technology Analysis, Adoption Strategies and Forecasts 2Global Banking Biometrics Market 2015-2020 - Market & Technology Analysis, Adoption Strategies and Forecasts 3
... consortium has sequenced the genome of the woodland strawberry, ... advance online edition of the journal Nature Genetics ... breeding tastier, hardier varieties of the berry and other ... parts list," said the consortium,s leader Kevin Folta, an ...
... shock protein 90 (Hsp90) can create diverse heritable traits in ... portion of the yeast genome. The finding has led the ... in shaping the evolutionary history of the yeast genome, and ... several years, Whitehead Member Susan Lindquist has built the case ...
... The latest success of Martek Biosciences, a rising-star among ... a plain, brick building on the University of Maryland ... the university,s Maryland Technology Enterprise Institute (Mtech), the company ... business. On December 21, a Dutch firm ...
Cached Biology News:Georgia Tech team helps decode newly sequenced strawberry genome 2Georgia Tech team helps decode newly sequenced strawberry genome 3Heat shock protein drives yeast evolution 2Heat shock protein drives yeast evolution 3Heat shock protein drives yeast evolution 4Tech firm joins the 'billion dollar club' -- with university help 2Tech firm joins the 'billion dollar club' -- with university help 3
Recorder REC-111 single-channel, 1. Category: Chromatography Systems & Accessories, Systems....
For the quantitative determination of cyclic AMP (cAMP) concentrations in cell culture supernates, serum, plasma, saliva, urine and cell lysates....
... Cryoscope for molecular weight determinations for petroleum-based applications. Multiple solvents can be used, such as ... ... ... ...
... For the ultimate in utility and ... to meet the needs of the researcher. ... interior dimensions or as sheet material that ... enclosures. These isolators are autoclavable and non-cytotoxic ...
Biology Products: