Navigation Links
Light from silicon nanocrystal LEDs
Date:2/22/2013

This press release is available in German.

Silicon nanocrystals have a size of a few nanometers and possess a high luminous potential. Scientists of KIT and the University of Toronto/Canada have now succeeded in manufacturing silicon-based light-emitting diodes (SiLEDs). They are free of heavy metals and can emit light in various colors. The team of chemists, materials researchers, nanoscientists, and opto-electronic experts presents its development in the "Nano Letters" journal (DOI: 10.1021/nl3038689).

Silicon dominates in microelectronics and photovoltaics industry, but has been considered unsuitable for light-emitting diodes for a long time. However, this is not true for nanoscopic dimensions: Minute silicon nanocrystals can produce light. These nanocrystals consist of a few hundred to thousand atoms and have a considerable potential as highly efficient light emitters, as was demonstrated by the team of Professor Uli Lemmer and Professor Annie K. Powell from KIT as well as Professor Geoffrey A. Ozin from the University of Toronto. In a joint project, the scientists have now succeeded in manufacturing highly efficient light-emitting diodes from the silicon nanocrystals.

So far, manufacture of silicon light-emitting diodes has been limited to the red visible spectral range and the near infrared. As regards the efficiency of silicon diodes emitting red light, researchers from Karlsruhe are already top in the world. "Controlled manufacture of diodes emitting multicolor light, however, is an absolutely novelty," explains Florian Maier-Flaig, scientist of the Light Technology Institute (LTI) of KIT and doctoral student of the Karlsruhe School of Optics and Photonics (KSOP). KIT scientists specifically adjust the color of the light emitted by the diodes by separating nanoparticles depending on their size. "Moreover, our light-emitting diodes have a surprising long-term stability that has not been reached before," Maier-Flaig reports. The increased service life of the components in operation is due to the use of nanoparticles of one size only. This enhances the stability of the sensitive thin-film components. Short circuits due to oversized particles are excluded.

The development made by the researchers from Karlsruhe and Toronto is also characterized by an impressing homogeneity of the luminous areas. The KIT researchers are among the few teams in the world that know how to manufacture such devices. "With the liquid-processed silicon LEDs that may potentially be produced on large areas as well as at low costs, the nanoparticle community enters new territory, the associated potentials of which can hardly be estimated today. But presumably, textbooks about semiconductor components have to be rewritten," says Geoffrey A. Ozin, who is presently working as a KIT distinguished research fellow at KIT's Center for Functional Nanostructures (CFN).

The SiLEDs also have the advantage that they do not contain any heavy metals. In contrast to cadmium selenide, cadmium sulfide or lead sulfide used by other groups of researchers, the silicon used by this group for the light-emitting nanoparticles is not toxic. Moreover, it is available at low costs and highly abundant on earth. Due to their many advantages, the SiLEDs will be developed further in cooperation with other partners.


'/>"/>

Contact: Monika Landgraf
presse@kit.edu
49-721-608-47414
Helmholtz Association of German Research Centres
Source:Eurekalert  

Related biology news :

1. February highlights from Ecological Society of America publications
2. Researchers say sunlight yields more efficient carbon dioxide to methanol model
3. Colorado Marijuana Task Force Gives Green Light To "Pot Tourism"
4. Painting with catalysts: Nano-engineered materials for detoxifying water by use of sunlight
5. Shedding new light on infant brain development
6. Diamond sheds light on basic building blocks of life
7. Light-emitting bioprobe fits in a single cell
8. Ancient insects shed light on biodiversity
9. Nature Methods study: Using light to control cell clustering
10. New American Chemical Society video highlights 5 of chocolates sweet benefits
11. Evaluating evolutionary rates could shed light into functions of uncharacterized genes
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Light from silicon nanocrystal LEDs
(Date:3/6/2017)... March 6, 2017 Mintigo , ... today announced Predictive Sales Coach TM , its ... sales intelligence into Salesforce. This unique AI application ... sales organizations with deep knowledge of their customers ... intelligent engagement. Predictive Sales Coach extends Mintigo,s existing ...
(Date:3/1/2017)... March 1, 2017  Aware, Inc. (NASDAQ: AWRE), a ... Richard P. Moberg has resigned, effective March ... Chief Financial Officer and Treasurer of Aware citing a ... as a member of the Board of Directors of ... co-Chief Executive Officer and co-President, General Counsel has been ...
(Date:2/26/2017)... , Feb. 25, 2017  Securus Technologies, ... technology solutions for public safety, investigation, corrections and ... Recidivism and Reentry. "Too often, too ... prisons and county jails are trying to tackle ... inmates and friends and family members. While significant steps ...
Breaking Biology News(10 mins):
(Date:3/29/2017)... Research and Markets has announced the addition of ... report to their offering. ... The study scope includes key agricultural ... synthetic biology tools and genome editing tools); synthetic biology-enabled chemicals ... and products are analyzed to determine present and future market ...
(Date:3/28/2017)... ... March 28, 2017 , ... NetDimensions announced today ... and enhance training plan management for consistent implementation of standards and regulatory requirements ... SHL Group to help improve and streamline their training and employee development programs, ...
(Date:3/28/2017)... ... March 28, 2017 , ... ... on March 22 in Philadelphia. The event was offered by the Chamber of ... Roundtable featured breakout groups and interaction with speakers who are leaders in ...
(Date:3/28/2017)... 2017 Summary This report provides ... and its partnering interests and activities since 2010. Description ... in-depth insight into the partnering activity of one of the ... reports are prepared upon purchase to ensure inclusion of the ... The report will be delivered in PDF format within 1 ...
Breaking Biology Technology: