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Quantum dots light up under strain

Date:
September 23, 2015
Source:
Asociación RUVID
Summary:
Semiconductor nanocrystals, or quantum dots, are tiny, nanometer-sized particles with the ability to absorb light and re-emit it with well-defined colors. With low-cost fabrication, long-term stability and a wide palette of colors, they have become a building blocks of the display technology, improving the image quality of TV-sets, tablets, and mobile phones. Exciting quantum dot applications are also emerging in the fields of green energy, optical sensing, and bio-imaging. 
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Quantum dots.
Credit: Image courtesy of Asociación RUVID

Semiconductor nanocrystals, or quantum dots, are tiny, nanometer-sized particles with the ability to absorb light and re-emit it with well-defined colors. With low-cost fabrication, long-term stability and a wide palette of colors, they have become a building blocks of the display technology, improving the image quality of TV-sets, tablets, and mobile phones. Exciting quantum dot applications are also emerging in the fields of green energy, optical sensing, and bio-imaging.

Prospects have become even more appealing after a publication, entitled "Band structure engineering via piezoelectric fields in strained anisotropic CdSe/CdS nanocrystals," was published in the journal Nature Communications last July. An international team, formed by scientists at the Italian Institute of Technology (Italy), the University Jaume I (Spain), the IBM research lab Zurich (Switzerland) and the University of Milano-Bicocca (Italy) demonstrated a radically new approach to manipulate the light emission of quantum dots.

The traditional operating principle of quantum dots is based on the so-called quantum confinement effect, where the particle size determines the color of the emitted light. The new strategy relies on a completely different physical mechanism; a strain induced electrical field inside the quantum dots. It is created by growing a thick shell around the dots. This way, researchers were able to compress the inner core, creating the intense internal electric field. This field now becomes the dominating factor in determining the emission properties.

The result is a new generation of quantum dots whose properties are beyond those enabled by quantum confinement alone. This not only broadens the application scope of the well-known CdSe/CdS material set but also of other materials. "Our findings add an important new degree of freedom to the development of quantum dot-based technological devices," the researchers say. "For example, the elapsed time between light absorption and emission can be extended to be more than 100 times longer compared to conventional quantum dots, which opens the way towards optical memories and smart pixel new devices. The new material could also lead to optical sensors that are highly sensitive to the electrical field in the environment on the nanometer scale."


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Journal Reference:

  1. Sotirios Christodoulou, Fernando Rajadell, Alberto Casu, Gianfranco Vaccaro, Joel Q. Grim, Alessandro Genovese, Liberato Manna, Juan I. Climente, Francesco Meinardi, Gabriele Rainò, Thilo Stöferle, Rainer F. Mahrt, Josep Planelles, Sergio Brovelli, Iwan Moreels. Band structure engineering via piezoelectric fields in strained anisotropic CdSe/CdS nanocrystals. Nature Communications, 2015; 6: 7905 DOI: 10.1038/ncomms8905

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Asociación RUVID. "Quantum dots light up under strain." ScienceDaily. ScienceDaily, 23 September 2015. <www.sciencedaily.com/releases/2015/09/150923083421.htm>.
Asociación RUVID. (2015, September 23). Quantum dots light up under strain. ScienceDaily. Retrieved May 26, 2017 from www.sciencedaily.com/releases/2015/09/150923083421.htm
Asociación RUVID. "Quantum dots light up under strain." ScienceDaily. www.sciencedaily.com/releases/2015/09/150923083421.htm (accessed May 26, 2017).

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