The UJI participates in the design of nanosheets with extended colour range to improve LCD and LED screens



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## The UJI participates in the design of nanosheets with extended colour range to improve LCD and LED screens The Quantum Chemistry Group, thanks to an international collaboration led by the University of Ghent, has made significant progress in the field of semiconductor materials for optical devices

01/11/2018 |
SCP

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Researchers from the Department of Physical and Analytical Chemistry of the Universitat Jaume I (UJI) have participated in the design of semiconductor nanosheets with extended colour range to improve LCD and LED screens thanks to an international collaboration led by the University of Ghent. The results of this research, which also involved ICFO-Barcelona and the Italian Institute of Technology, have been published in the journal *Nano Letters.*

The lecturer of Physical Chemistry of the UJI Juan Ignacio Climente, researcher in this project, explains that these semiconductor structures for optical devices, until now, "offered intense and pure colours in the blue and green, but the emission in other colours was deficient. Through a synthetic innovation, this study has allowed to extend the optimal results to yellow, orange and red”.

The joint work of the Quantum Chemistry Group of the UJI, coordinated by lecturer Juan Ignacio Climente, with the research group of Dr. Iwan Moreels in Ghent and experts from other European universities, has allowed a significant advance in the development of semiconductor materials for optical devices.

Specifically, from the Universitat Jaume I, in the words of Climente, "we have made quantum mechanical calculations that show that the new colours of the emitted light are the result of the greater thickness of the nanosheets synthesized by our collaborators, and have offered new insights into the unique optical properties of these   
materials". "The new synthetic route allows to extend the usual thicknesses (3.5-5.5 layers of atoms) to 8.5 layers", adds the lecturer.

**SECOND GENERATION OF QUANTUM DOT DISPLAYS**

Semiconductor nanosheets are destined to constitute the second generation of the so-called *quantum dot displays*, already present in the market, since they offer more pure and intense colours than the current technology for LCD or LED screens. In addition, these materials obtained thanks to nanotechnology are also under study for their application in laser devices and optical sensors.

The Quantum Chemistry Group of the School of Technology and Experimental Sciences of the Universitat Jaume I is specialized in the theoretical study of nanocrystals. Their researchers model these systems with quantum mechanics tools to understand and predict their physical behaviour. Recently, this group demonstrated that new semiconductor nanosheets synthesized in laboratories can improve the luminosity of LEDs, lasers and LCD screens of computers or televisions because they allow to minimize energy losses compared to current semiconductor materials.

More information:

[Sotirios Christodoulou](https://pubs.acs.org/author/Christodoulou%2C+Sotirios), [Juan I. Climente](https://pubs.acs.org/author/Climente%2C+Juan+I), [Josep Planelles](https://pubs.acs.org/author/Planelles%2C+Josep), [Rosaria Brescia](https://pubs.acs.org/author/Brescia%2C+Rosaria), [Mirko Prato](https://pubs.acs.org/author/Prato%2C+Mirko), [Beatriz Martín-García](https://pubs.acs.org/author/Martín-García%2C+Beatriz), [Ali Hossain Khan](https://pubs.acs.org/author/Khan%2C+Ali+Hossain), [Iwan Moreels](https://pubs.acs.org/author/Moreels%2C+Iwan)  
Chloride-Induced Thickness Control in CdSe Nanoplatelets  
*Nano Lett.*, 2018, *18* (10), pp 6248–6254 DOI: 10.1021/acs.nanolett.8b02361

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