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 this research provide new insight into the mechanism of quantum-dot blinking, and should help in the development of methods to control and suppress blinking. Detailed results of this work have been published in a paper in the Proceedings of the National Academy of Sciences.


'/>"/>

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

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:5/26/2016)... Jersey and READING, England ... Indegene ( http://www.indegene.com ), a leading global ... life science, pharmaceutical and healthcare organisations and TranScrip ... innovative scientific support throughout the product lifecycle, today ... the launch of IntraScience.      (Logo: ...
(Date:5/26/2016)... NEW YORK , May 26, 2016 ... industry, investors see value in this space. Today,s pre-market research ... Healthcare equities: Radius Health Inc. (NASDAQ: RDUS ), ... (NASDAQ: ARWR ), and Five Prime Therapeutics Inc. ... these stock technical briefings at: http://www.activewallst.com/ ...
(Date:5/26/2016)... ... May 26, 2016 , ... Kinder Scientific (KinderScientific.com), ... developments that position the Company for the future. Kinder Scientific announces restructured ... Kinghorn has been appointed Chairman of the Board, Curtis D. Kinghorn has been ...
(Date:5/25/2016)... Diego, Calif. (PRWEB) , ... May 25, 2016 , ... ... Diego area and has consistently been rated one of its top attractions. Fortune ... the globe to participate in a unique and intimate team-building experience. , Each event ...
Breaking Biology Technology:
(Date:5/9/2016)... 9, 2016 Elevay is currently ... expanding freedom for high net worth professionals seeking travel ... globally connected world, there is still no substitute for ... duplicate sealing your deal with a firm handshake. This ... taking advantage of citizenship via investment programs like those ...
(Date:4/26/2016)... DUBLIN , April 27, 2016 ... of the  "Global Multi-modal Biometrics Market 2016-2020"  report ... ) , The analysts forecast ... a CAGR of 15.49% during the period 2016-2020.  ... a number of sectors such as the healthcare, ...
(Date:4/13/2016)... 13, 2016  IMPOWER physicians supporting Medicaid patients in ... new clinical standard in telehealth thanks to a new ... higi platform, IMPOWER patients can routinely track key health ... mass index, and, when they opt in, share them ... to a local retail location at no cost. By ...
Breaking Biology News(10 mins):