Industry News




02/22/2013

Silicon Nanocrystal LEDs

 
New applications for LED continue to make noise in the world of facility management and building operation.

Photo: F. Maier-Flaig, KIT/LTI

LED lighting often manages to find its way into the facility management spotlight.  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 the microelectronics and photovoltaics industries, but has been considered unsuitable for light-emitting diodes for some 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 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,” says 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 says. 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 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.

 

Xcel Energy’s Data Center Efficiency program can help data centers and large-scale IT operations improve reliability and energy efficiency.


Visit our website today to learn about the design flexibility of a Morton building and the endless possibilities of partnering with our designBUILD team.


Wood construction is both cost and energy efficient. Check out Morton Buildings and our designBUILD team online today to discover all the benefits of post-frame construction.

When choosing a metal-clad building for your next construction project, consider Morton Buildings, Inc., and their designBUILD team, we’ll make your dream a reality. 

We Can Help You Reduce Energy by 30%

Our mission is to help our customers manage their buildings' energy costs, improve reliability, and enhance performance while having a positive impact on the environment.
CLICK HERE to find out how.

Xcel Energy’s Data Center Efficiency program can help data centers and large-scale IT operations improve reliability and energy efficiency.


Visit our website today to learn about the design flexibility of a Morton building and the endless possibilities of partnering with our designBUILD team.


Wood construction is both cost and energy efficient. Check out Morton Buildings and our designBUILD team online today to discover all the benefits of post-frame construction.

When choosing a metal-clad building for your next construction project, consider Morton Buildings, Inc., and their designBUILD team, we’ll make your dream a reality. 

We Can Help You Reduce Energy by 30%

Our mission is to help our customers manage their buildings' energy costs, improve reliability, and enhance performance while having a positive impact on the environment.
CLICK HERE to find out how.


 
comments powered by Disqus
08/28/2015

Temperatures reach highest point since 1880.

08/27/2015

Large improvements drive water conservation on West Coast.

08/26/2015

Data breaches becoming more common.

08/25/2015

Research shows link between extreme weather events and long power disruptions.

08/24/2015

Specifications to improve wall resiliency.

08/21/2015

New resource can help FMs create scope of custodial work.

08/20/2015

Rule created to stem Legionnaires’ disease outbreak.

08/19/2015

Portable devices encourage sedentary workers to exercise while seated.

08/18/2015

PACE program to drive building improvements.

08/17/2015

Survey shows management systems can streamline work order process.

08/14/2015

Tool will help schools improve air quality.

08/13/2015

Proposed ASHRAE rule to improve communication about energy consumption, forecasts.

08/12/2015

Installations rise as electricity costs drop to an all-time low.

08/11/2015

Linear, low-bay/high-bay LEDs spotlighted as best choices for commercial retrofits.

08/10/2015

Wind, solar set for big increases.

08/07/2015

New requirement will cut food waste.

08/06/2015

ICC, ASHRAE will streamline compliance path for IgCC and Standard 189.1.

08/05/2015

Benefits inspire positive health changes for workers.

08/04/2015

New program from the EPA will cut GHG emissions.

08/03/2015

LED, smart control adoption will help FMs meet energy goals.

Page 1 of 56
FirstPrevious[1]2345678910NextLast

Sponsored Links