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)... 2016 Despite the volatility that continues ... space. Today,s pre-market research on ActiveWallSt.com directs the investor community,s ... RDUS ), Cerus Corp. (NASDAQ: CERS ... Five Prime Therapeutics Inc. (NASDAQ: FPRX ). Register ... http://www.activewallst.com/ On Wednesday, shares in ...
(Date:5/26/2016)... , ... May 26, 2016 , ... ... FireflySci cuvettes are used in leading laboratories all over the globe. Their cute ... In addition to manufacturing awesome cuvettes, FireflySci makes spectrophotometer calibration standards that never ...
(Date:5/25/2016)... ... May 25, 2016 , ... The Ankle Plating ... options designed to address fractures of the distal tibia and fibula. This system ... Ankle Plating System 3 is composed of seven plate families that span the ...
(Date:5/25/2016)... ... ... Scientists at the University of Athens say they have evidence that the variety ... that could lead to one good one. Surviving Mesothelioma has just posted an article ... team evaluated 98 mesothelioma patients who got a second kind of drug ...
Breaking Biology Technology:
(Date:4/19/2016)... 2016 The new GEZE SecuLogic ... web-based "all-in-one" system solution for all door components. It ... the door interface with integration authorization management system, and ... The minimal dimensions of the access control and the ... installations offer considerable freedom of design with regard to ...
(Date:4/14/2016)... TEL AVIV, Israel , April 14, 2016 /PRNewswire/ ... in Behavioral Authentication and Malware Detection, today announced the ... has already assumed the new role. Goldwerger,s ... for BioCatch, on the heels of the deployment of ... In addition, BioCatch,s behavioral biometric technology, which discerns unique ...
(Date:3/31/2016)... , March 31, 2016  Genomics firm Nabsys has ... CEO, Barrett Bready , M.D., who returned to ... the original technical leadership team, including Chief Technology Officer, ... Product Development, Steve Nurnberg and Vice President of Software ... the company. Dr. Bready served as CEO ...
Breaking Biology News(10 mins):