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Saturday, 19 October 2019
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InP-QLED-High-EfficiencyWhile Cd-based materials are under the risk to be completely banned sooner or later, much attention has been paid in the last few years to the development of non-toxic analogues with similarly good performance. In case of quantum-dots-based light emitting diods (QLED), the maximal brightness and efficiency of luminescence are the most critical parameters determining whether the new technology can be accepted for mass production. The best results up to now have been achieved with QDs of copper-indium-sulfide (max. brightness 2100 cd/m2) and silicon (efficiency of 1.1%).

Now a new breakthrough in the development of Cd-free QLED was reported by a group of scientists from Seoul National University & KIST in an article published online in ACS-Nano describes novel quantum dots made from cadmium-free lnP/ZnSeS core-shell semiconductor nanoparticles. The special feature of these QDs is the gradient structure of the shell, where selenium resides mostly close to the core, while sulfide enriches the outer part of the shell. The further fine tuning of the shell thickness and of the assembly of the QLED brought its results. The synthesized QDs had the electroluminescence quantum yield of 3.46% (compared to the previous record of 1.1%) and brightness of 3900 cd/m2 while showing the photoluminescence QY of 70%.

More information is available in the online issue of ACS-Nano, doi 10.1021/nn403594j.

Image courtesy: ACS Nano

(C) NanoJam 2013

More articles on the topic:

Quantum Dots Can Shine Even Brighter

Quantum Dots Laser Developed

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0 #1 suhaib alyamani 2014-09-16 12:02
iam CdS recycling thin film and get more efficiency 1.5
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