+44 (0)24 7671 8970
More publications     •     Advertise with us     •     Contact us
 
News Article

Chinese team report best solution-processed red LED

News
Quantum-dot-based LED has lifetime of  more than 100,000 hours at 100 cdm-2


Solution-processed LEDs using conjugated polymers or quantum dots as emitters have created interest over the past two decades for their potential for low-cost fabrication on flexible plastic substrates. However, the overall performance of such LEDs  -  including their efficiency, efficiency roll-off at high current densities, turn-on voltage and lifetime under operational conditions - is not as good as the best vacuum-deposited organic LEDs.

Now scientists from Zhejiang University, Chinese Academy of Sciences, and Nanjing Tech University have reported a solution-processed, multilayer quantum-dot-based LED with excellent performance and reproducibility.

Their quantum dot LED, which was the subject of a paper in Nature today, exhibits colour-saturated deep-red emission, sub-bandgap turn-on at 1.7V, high external quantum efficiencies of up to 20.5 percent, low efficiency roll-off (up to 15.1 per cent of the external quantum efficiency at 100 mA cm-2), and a long operational lifetime of more than 100,000 hours at 100 cd m-2.

According to to the researchers, this makes making this device the best-performing solution-processed red LED so far, comparable to state-of-the-art vacuum-deposited organic LEDs.

The optoelectronic performance is achieved by inserting an insulating layer between the quantum dot layer and the oxide electron-transport layer to optimise charge balance in the device and preserve the superior emissive properties of the quantum dots.

The researchers anticipate that the results will be a starting point for further research, leading to high-performance, all-solution-processed quantum-dot-based LEDs ideal for next-generation display and solid-state lighting technologies.

'Solution-processed, high-performance light-emitting diodes based on quantum dots' by Xingliang Dai et al, appears in Nature (2014) doi:10.1038/nature13829

×
Search the news archive

To close this popup you can press escape or click the close icon.
×
  • 1st January 1970
  • 1st January 1970
  • 1st January 1970
  • 1st January 1970
  • View all news 22645 more articles
Logo
×
Register - Step 1

You may choose to subscribe to the Compound Semiconductor Magazine, the Compound Semiconductor Newsletter, or both. You may also request additional information if required, before submitting your application.


Please subscribe me to:

 

You chose the industry type of "Other"

Please enter the industry that you work in:
Please enter the industry that you work in: