Navigation Links
Researchers set new record for brightness of quantum dots
Date:9/25/2007

CHAMPAIGN, Ill. -- By placing quantum dots on a specially designed photonic crystal, researchers at the University of Illinois have demonstrated enhanced fluorescence intensity by a factor of up to 108. Potential applications include high-brightness light-emitting diodes, optical switches and personalized, high-sensitivity biosensors.

We are using photonic crystals in a new way, said Brian Cunningham, a professor of electrical and computer engineering and corresponding author of a paper published in the August issue of the journal Nature Nanotechnology. We tune them to the specific wavelength of a laser used to stimulate the quantum dots, which couples the energy more efficiently and increases the brightness.

A quantum dot is a tiny piece of semiconductor material 2 to 10 nanometers in diameter (a nanometer is 1 billionth of a meter). When illuminated with invisible ultraviolet light, a quantum dot will fluoresce with visible light.

To enhance the fluorescence, Cunningham and colleagues at the U. of I. begin by creating plastic sheets of photonic crystal using a technique called replica molding. Then they fasten commercially available quantum dots to the surface of the plastic.

We designed the photonic crystal to efficiently capture the light from an ultraviolet laser and to concentrate its intensity right within the surface where the quantum dots are located, said Cunningham, who also is affiliated with the universitys Beckman Institute, the Micro and Nanotechnology Laboratory, and the Institute for Genomic Biology. Enhanced absorption by the quantum dots is the first improvement we made.

Enhanced, directed emission from the quantum dots is the second improvement.

Quantum dots normally give off light in all directions. However, because the researchers quantum dots are sitting on a photonic crystal, the energy can be channeled in a preferred direction toward a detector, for example.

While the researchers report an enhancement of f
'/>"/>

Contact: James E. Kloeppel, Physical Sciences Editor
kloeppel@uiuc.edu
217-244-1073
University of Illinois at Urbana-Champaign
Source:Eurekalert

Page: 1 2

Related biology news :

1. Researchers discover way to make cells in the eye sensitive to light
2. Researchers find how protein allows insects to detect and respond to pheromones
3. Researchers Uncover Key Step In Manufacture of Memory Protein
4. NYU researchers simulate molecular biological clock
5. Researchers reveal the infectious impact of salmon farms on wild salmon
6. Researchers identify target for cancer drugs
7. Vital step in cellular migration described by UCSD medical researchers
8. ASU researchers finds novel chemistry at work to provide parrots vibrant red colors
9. UCSD researchers maintain stem cells without contaminated animal feeder layers
10. Researchers discover molecule that causes secondary stroke
11. Researchers find missing genes of ancient organism
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:7/9/2014)... cell divides, it must first make a copy of its ... that occurs billions of times a day in the human ... tools that cells use to replicate DNAthe enzymes that unzip ... a clear picture of how the process works. , Now, ... to decipher what goes on at the "replication fork"the point ...
(Date:7/8/2014)... reefs and the animals that depend on them relies ... sea creature to get fatand to be flexible about ... the first study of its kind, scientists at The ... live symbiotically with algaeare better able to recover from ... keep large energy reservesmostly as fatsocked away in their ...
(Date:7/8/2014)... increased risk of severe perineal tearing during childbirth in women ... a new study published today (9 July) in BJOG: ... This study, investigates among women who have had a third ... subsequent pregnancies and the recurrence of severe perineal tears. ... in some women the tear may be more extensive. A ...
Breaking Biology News(10 mins):Rockefeller scientists first to reconstitute the DNA 'replication fork' 2Rockefeller scientists first to reconstitute the DNA 'replication fork' 3Rockefeller scientists first to reconstitute the DNA 'replication fork' 4For corals adapting to climate change, it's survival of the fattest -- and most flexible 2For corals adapting to climate change, it's survival of the fattest -- and most flexible 3For corals adapting to climate change, it's survival of the fattest -- and most flexible 4Mode of delivery following a perineal tear and recurrence rate in subsequent pregnancies 2
... of corals are likely to succeed at the expense of ... in the Cell Press journal Current Biology that ... "The good news is that, rather than experiencing wholesale ... the mix of coral species as the ocean warms and ...
... genomes, says a new study of poison frogs from ... changes over time, but the rate at which those ... Juan C. Santos of the National Evolutionary Synthesis Center ... trying to explain why some species have faster-changing genomes ...
... ARLINGTON, Va.The deafening roar of supersonic aircraft can cause ... so the Office of Naval Research (ONR) is funding ... announced April 12. "The noise problem falls into ... noise impact on the communities surrounding air bases," said ...
Cached Biology News:Under climate change, winners and losers on the coral reef 2Athletic frogs have faster-changing genomes 2ONR taps research teams to help reduce jet noise 2
(Date:1/15/2014)... device," Nobel laureate Herbert Kroemer famously observed, referring ... the junctures where layers of different materials meet. ... between layers of metal oxides are becoming increasingly ... spintronics, high-temperature superconductors, ferroelectrics and multiferroics. Realizing the ...
(Date:1/15/2014)... Jan. 15, 2014   Niagara Thermal Products is ... Buffalo BioBlower Technologies LLC ("B3") as the critical thermal ... award from the Army Corps of Engineers.  B3 has ... all biological contaminants and destroys VOCs and other chemical ...
(Date:1/15/2014)... SAN JOSE, California , January 15, 2014 ... for cancer, today announced the appointment of Thomas C Reynolds ... over 20 years, development experience gained in the biotechnology industry, ... "I am delighted to welcome Tom at this transformative ...
(Date:1/15/2014)... A study has been launched to test whether ... could help to tackle the problem of obesity.  This unique ... surgery based in Stowmarket) and academics at University Campus Suffolk ... technology, which is inspired by equipment used to collect data ...
Breaking Biology Technology:A deeper look at interfaces 2Niagara Thermal Products LLC Selected as Critical Supplier for Buffalo BioBlower Air Purification Systems 2Oxford BioTherapeutics Appoints Thomas C Reynolds MD, PhD to its Board of Directors 2Oxford BioTherapeutics Appoints Thomas C Reynolds MD, PhD to its Board of Directors 3Formula 1 Technology Tackles Obesity in Unique Healthcare Partnership 2Formula 1 Technology Tackles Obesity in Unique Healthcare Partnership 3Formula 1 Technology Tackles Obesity in Unique Healthcare Partnership 4
... 2011  Amgen (NASDAQ: AMGN ) announced that its ... for the first quarter of 2012. This represents an approximate 29 ... The dividend will be paid on March 7, 2012 to ... on Feb. 15, 2012.  About Amgen ...
... Inc. (PDL) (NASDAQ: PDLI ) today announced that ... payment of $0.15 per share to all stockholders owning shares ... (Logo: http://photos.prnewswire.com/prnh/20110822/SF55808LOGO )   ... humanization of monoclonal antibodies and, by doing so, enabled the ...
... tune and enhance thermal conductivity a basic property generally ... engineers a new tool for managing thermal effects in smart ... devices. The finding was made by a group of ... at Vanderbilt University, and published online in the journal ...
Cached Biology Technology:Amgen Announces 2012 First Quarter Dividend 2Amgen Announces 2012 First Quarter Dividend 3New method for enhancing thermal conductivity could cool computer chips, lasers and other devices 2New method for enhancing thermal conductivity could cool computer chips, lasers and other devices 3
... The IHC Select Immunophosphatase Secondary Detection System ... IHC Select Prediluted Primary Antibody reagents, which ... qualitative identification of antigens by light microscopy ... Secondary Detection System may also be used ...
... FLISP Assay with SR-101 Labeled Substrates ... • Accurately measure serine protease activation ... • B-Bridge's FLISP Kits utilize cell-permeable, ... (FLISPs) to measure chymotrypsin-like activity in ...
From the company that first brought you the chromatin immunoprecipitation (ChIP) kit, a new and improved kit, EZ-ChIP, is now available to make your experiments easier, quicker, and most importantly,...
The PDS-1000 He Hepta system includes the PDS-1000 He biolistic system and the Hepta adaptor....
Biology Products: