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Data on Quantum Dots Described by Researchers at Display Research Center (Over 40 cd/A Efficient Green Quantum Dot Electroluminescent Device...

July 1, 2014



Data on Quantum Dots Described by Researchers at Display Research Center (Over 40 cd/A Efficient Green Quantum Dot Electroluminescent Device Comprising Uniquely Large-Sized Quantum Dots)

By a News Reporter-Staff News Editor at Journal of Physics Research -- Investigators discuss new findings in Quantum Dots. According to news originating from Kyunggi Do, South Korea, by VerticalNews correspondents, research stated, "Green CdSe@ZnS quantum dots (QDs) of 9.5 nm size with a composition gradient shell are first prepared by a single-step synthetic approach, and then 12.7 nm CdSe@ZnS/ZnS QDs, the largest among ZnS-shelled visible-emitting QDs available to date, are obtained through the overcoating of an additional 1.6 nm thick ZnS shell. Two QDs of CdSe@ZnS and CdSe@ZnS/ZnS are incorporated into the solution-processed hybrid QD-based light-emitting diode (QLED) structure, where the QD emissive layer (EMI) is sandwiched by poly (9-vinlycarbazole) and ZnO nanoparticles as hole and electron-transport layers, respectively."

Our news journalists obtained a quote from the research from Display Research Center, "We find that the presence of an additional ZnS shell makes a profound impact on device performances such as luminance and efficiencies. Compared to CdSe@ZnS QD-based devices the efficiencies of CdSe@ZnS/ZnS QD-based devices are overwhelmingly higher, specifically showing unprecedented values of peak current efficiency of 46.4 cd/A and external quantum efficiency of 12.6%."

According to the news editors, the research concluded: "Such excellent results are likely attributable to a unique structure in CdSe@ZnS/ZnS QDs with a relatively thick ZnS outer shell as well as a well-positioned intermediate alloyed shell, enabling the effective suppression of nonradiative energy transfer between closely packed EMI QDs and Auger recombination at charged QDs."

For more information on this research see: Over 40 cd/A Efficient Green Quantum Dot Electroluminescent Device Comprising Uniquely Large-Sized Quantum Dots. ACS Nano, 2014;8(5):4893-4901. ACS Nano can be contacted at: Amer Chemical Soc, 1155 16TH St, NW, Washington, DC 20036, USA. (American Chemical Society - www.acs.org; ACS Nano - www.pubs.acs.org/journal/ancac3)

The news correspondents report that additional information may be obtained from K.H. Lee, Samsung Display Co Ltd, Display Res Center, Yongin 446811, Kyunggi Do, South Korea. Additional authors for this research include J.H. Lee, H.D. Kang, B. Park, Y. Kwon, H. Ko, C. Lee, J. Lee and H. Yang.

Keywords for this news article include: Asia, Kyunggi Do, South Korea, Quantum Dots, Nanotechnology, Quantum Physics, Emerging Technologies

Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2014, NewsRx LLC


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Source: Journal of Physics Research


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