Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Improved stability of plastic light-emitting diodes

19.04.2018

Polymer light-emitting diodes (PLEDs) are attractive for use in large–area displays and lighting panels, but their limited stability impedes commercialization. Scientists of the Max Planck Institut for Polymer Research (MPIP) in Mainz have discovered the reasons for instability.

Monitor screens and smartphones that can be rolled and folded up are applications that could become possible in the future thanks to the development of polymer (plastic) based semiconductors.


Orange-emitting polymer light-emitting diode

© MPIP

Electronics from these conducting plastics pave the way for affordable, flexible and printable electronic components. A major obstacle hindering the market introduction of plastic based light-emitting diodes (PLEDs) is their relatively limited stability.

After a few months of continuous operation their light-output starts to decrease. In spite of many investigations in both industry and academic laboratories the cause of this degradation effect is only poorly understood.

Researchers at the Max Planck Institute for Polymer Research have recently discovered the mechanism causing the PLED degradation.

During degradation defects are formed that strongly reduce the current injected from the positive electrode. Furthermore, these defects lead to unwanted losses in the light generation processes.

The research results are published in the latest edition of the scientific journal Nature Materials.
By using a mixture of two polymers (plastics) the effect of the defects can be strongly suppressed, leasing to improved stability of the PLEDs.

Professor Paul Blom, Director at the Max Planck Institute for Polymer Research and head of its department for Molecular Electronics, and his research team are confident that the improved stability will boost the applicability of plastic light-emitting diodes.

Beate Schiewe | Max-Planck-Institut für Polymerforschung

More articles from Power and Electrical Engineering:

nachricht Energy-saving new LED phosphor
24.04.2019 | Universität Innsbruck

nachricht Neuron and synapse-mimetic spintronics devices developed
17.04.2019 | Tohoku University

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: Energy-saving new LED phosphor

The human eye is particularly sensitive to green, but less sensitive to blue and red. Chemists led by Hubert Huppertz at the University of Innsbruck have now developed a new red phosphor whose light is well perceived by the eye. This increases the light yield of white LEDs by around one sixth, which can significantly improve the energy efficiency of lighting systems.

Light emitting diodes or LEDs are only able to produce light of a certain colour. However, white light can be created using different colour mixing processes.

Im Focus: Quantum gas turns supersolid

Researchers led by Francesca Ferlaino from the University of Innsbruck and the Austrian Academy of Sciences report in Physical Review X on the observation of supersolid behavior in dipolar quantum gases of erbium and dysprosium. In the dysprosium gas these properties are unprecedentedly long-lived. This sets the stage for future investigations into the nature of this exotic phase of matter.

Supersolidity is a paradoxical state where the matter is both crystallized and superfluid. Predicted 50 years ago, such a counter-intuitive phase, featuring...

Im Focus: Explosion on Jupiter-sized star 10 times more powerful than ever seen on our sun

A stellar flare 10 times more powerful than anything seen on our sun has burst from an ultracool star almost the same size as Jupiter

  • Coolest and smallest star to produce a superflare found
  • Star is a tenth of the radius of our Sun
  • Researchers led by University of Warwick could only see...

Im Focus: Quantum simulation more stable than expected

A localization phenomenon boosts the accuracy of solving quantum many-body problems with quantum computers which are otherwise challenging for conventional computers. This brings such digital quantum simulation within reach on quantum devices available today.

Quantum computers promise to solve certain computational problems exponentially faster than any classical machine. “A particularly promising application is the...

Im Focus: Largest, fastest array of microscopic 'traffic cops' for optical communications

The technology could revolutionize how information travels through data centers and artificial intelligence networks

Engineers at the University of California, Berkeley have built a new photonic switch that can control the direction of light passing through optical fibers...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

Revered mathematicians and computer scientists converge with 200 young researchers in Heidelberg!

17.04.2019 | Event News

First dust conference in the Central Asian part of the earth’s dust belt

15.04.2019 | Event News

Fraunhofer FHR at the IEEE Radar Conference 2019 in Boston, USA

09.04.2019 | Event News

 
Latest News

Proteins stand up to nerve cell regression

24.04.2019 | Life Sciences

New sensor detects rare metals used in smartphones

24.04.2019 | Life Sciences

Controlling instabilities gives closer look at chemistry from hypersonic vehicles

24.04.2019 | Life Sciences

VideoLinks
Science & Research
Overview of more VideoLinks >>>