Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Scientists create world’s most efficient light-bulb

27.08.2003


Donegan’s Microcavities: quantum dots emitting light in green and red


Scientists have successfully produced the most efficient light bulb ever – but on the microscopic scale. Researchers at Trinity College, Dublin have discovered a technique which significantly improves the output of light from quantum dots, and also allows their light to be focussed and manipulated easily. Their findings are published today in the Institute of Physics journal Semiconductor Science and Technology.

Dr Yuri Rakovich and Dr John Donegan from Trinity College, Dublin working with researchers at the universities of Hamburg and Munich, have successfully placed quantum dots (the most efficient light-bulb in the world) onto a tiny polymer sphere.

Scientists have known for some time that quantum dots (tiny particles made from certain semiconducting materials) have numerous applications as they are capable of producing light without wasting any energy as heat. They are the basic unit of quantum computers – computers around 10,000 times faster that the fastest computer currently in use. John Donegan’s team have found that they can make quantum dots more efficient than ever. By embedding quantum dots on the surface of a microsphere they can enhance the output of light from these quantum dots by a factor of 20 and - because these structures are spherical - they allow the light emitted from the quantum dots to be focussed into a fine beam which can be moved around easily by the researcher.



The Trinity College team’s work has been carried out entirely under the microscope. They took a polymer microsphere of about 5 microns in diameter (one twentieth the diameter of a human hair) and coated the surface with quantum dots made of cadmium telluride, a semiconductor similar to gallium nitride. Once the surface of the microsphere was fully coated in quantum dots, they observed the surface emitting light in different colours; in this case red and green.

Dr Donegan and his team have been trying to improve the efficiency of light emission from quantum dots so that they can create a beam of light as tightly focussed as possible. These beams have a large number of possible applications and are likely to be applied to all branches of quantum technology in the future (computing, mobile phones, energy production). Dr Donegan’s team are particularly interested in the manipulation of single strands of DNA. They are able to produce beams of light thin enough to be capable of manipulating a single strand of DNA, stretching it and reading the genetic information. Devices which can do this with light have been dubbed “optical tweezers” but Donegan’s group believe they can now create a beam of light much finer than ever before and one which can be manipulated much more easily than previously thought possible.

Dr Donegan said: “We hope that our microcavity will help in all possible applications of quantum dots but especially in our ability to manipulate physically single strands of DNA. It could have major uses in genetic analysis and in gene sequencing where the ability to handle DNA strands with increasing accuracy and dexterity is becoming ever more important”.

| alfa
Further information:
http://stacks.iop.org/SS/18/914

More articles from Power and Electrical Engineering:

nachricht New graphene-based metasurface capable of independent amplitude and phase control of light
20.02.2020 | The Korea Advanced Institute of Science and Technology (KAIST)

nachricht A step towards controlling spin-dependent petahertz electronics by material defects
19.02.2020 | Max-Planck-Institut für Struktur und Dynamik der Materie

All articles from Power and Electrical Engineering >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: A step towards controlling spin-dependent petahertz electronics by material defects

The operational speed of semiconductors in various electronic and optoelectronic devices is limited to several gigahertz (a billion oscillations per second). This constrains the upper limit of the operational speed of computing. Now researchers from the Max Planck Institute for the Structure and Dynamics of Matter in Hamburg, Germany, and the Indian Institute of Technology in Bombay have explained how these processes can be sped up through the use of light waves and defected solid materials.

Light waves perform several hundred trillion oscillations per second. Hence, it is natural to envision employing light oscillations to drive the electronic...

Im Focus: Freiburg researcher investigate the origins of surface texture

Most natural and artificial surfaces are rough: metals and even glasses that appear smooth to the naked eye can look like jagged mountain ranges under the microscope. There is currently no uniform theory about the origin of this roughness despite it being observed on all scales, from the atomic to the tectonic. Scientists suspect that the rough surface is formed by irreversible plastic deformation that occurs in many processes of mechanical machining of components such as milling.

Prof. Dr. Lars Pastewka from the Simulation group at the Department of Microsystems Engineering at the University of Freiburg and his team have simulated such...

Im Focus: Skyrmions like it hot: Spin structures are controllable even at high temperatures

Investigation of the temperature dependence of the skyrmion Hall effect reveals further insights into possible new data storage devices

The joint research project of Johannes Gutenberg University Mainz (JGU) and the Massachusetts Institute of Technology (MIT) that had previously demonstrated...

Im Focus: Making the internet more energy efficient through systemic optimization

Researchers at Chalmers University of Technology, Sweden, recently completed a 5-year research project looking at how to make fibre optic communications systems more energy efficient. Among their proposals are smart, error-correcting data chip circuits, which they refined to be 10 times less energy consumptive. The project has yielded several scientific articles, in publications including Nature Communications.

Streaming films and music, scrolling through social media, and using cloud-based storage services are everyday activities now.

Im Focus: New synthesis methods enhance 3D chemical space for drug discovery

After helping develop a new approach for organic synthesis -- carbon-hydrogen functionalization -- scientists at Emory University are now showing how this approach may apply to drug discovery. Nature Catalysis published their most recent work -- a streamlined process for making a three-dimensional scaffold of keen interest to the pharmaceutical industry.

"Our tools open up whole new chemical space for potential drug targets," says Huw Davies, Emory professor of organic chemistry and senior author of the paper.

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

70th Lindau Nobel Laureate Meeting: Around 70 Laureates set to meet with young scientists from approx. 100 countries

12.02.2020 | Event News

11th Advanced Battery Power Conference, March 24-25, 2020 in Münster/Germany

16.01.2020 | Event News

Laser Colloquium Hydrogen LKH2: fast and reliable fuel cell manufacturing

15.01.2020 | Event News

 
Latest News

Active droplets

21.02.2020 | Medical Engineering

Finding new clues to brain cancer treatment

21.02.2020 | Health and Medicine

Beyond the brim, Sombrero Galaxy's halo suggests turbulent past

21.02.2020 | Physics and Astronomy

VideoLinks
Science & Research
Overview of more VideoLinks >>>