The UJI advances in the design of LEDs to improve lighting in high definition screens



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## The UJI advances in the design of LEDs to improve lighting in high definition screens

26/04/2018 |
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A research carried out by the Universitat Jaume I in Castelló (UJI) advances in the design of white LEDs based on quantum dots in order to improve lighting in high definition screens, among other applications. The results of this work, directed by the lecturer of Applied Physics Iván Mora Seró, member of the Institute of Advanced Materials (INAM), have been published in the *Nano Research* journal.

"We have studied the stability of white light emission of LEDs based on their different colour components — blue, green, red and orange — using electro-optical techniques", argues Mora Seró. The researcher of the Department of Physics says that quantum dots allow a degree of purity in the colour of lighting, "essential to get thinner screens — for computers, televisions, etc. — and with better quality lighting, as is the case of the so-called QD TV SUHD screens, quantum dot televisions with super-ultra-high definition”.

This work, which has had the participation of other members of the INAM research unit, such as Rafael S. Sánchez and Bruno Clasen Hames, is part of the research line of the No Limit project. Iván Mora Seró got last year a two million euros Consolidator Grant from the European Research Council (ERC) — the first obtained by the UJI — to produce solar cells with different materials, such as colloidal quantum dots and halide perovskites.

The objective of Mora Seró's research is also to advance in the evolution of LEDs, while at the same time obtaining more economical, less polluting light devices that have a higher energy efficiency. As the researcher points out, "between 15 and 20 % of the world's energy is dedicated to lighting; consequently, obtaining cheaper and more efficient light sources is a fundamental contribution in terms of energy saving and global challenges, such as global warming and climate change".

This research is based on the development of a LED technology that uses quantum dots to emit light with purer colours. The colour with which they emit quantum dots depends on their size and it can be controlled in chemical synthesis processes. In this way, in the laboratories of the UJI, LEDs with quantum dots have been prepared with emission in blue , green , orange and red to form, finally, white LEDs with the combination of quantum dots of different colours (as is shown in the picture). The stability of the emission, as well as its brightness and efficiency, have been significantly studied. "Quantum dots have a very narrow emission in terms of wavelength, which allows to obtain purer colours and, therefore, a greater definition on the screens", he concludes.

The same research team of the INAM is applying this experience to new quantum dots formed with halide perovskites that exhibit an even smaller emission width and, therefore, a greater potential to improve current colour definition features.

Iván Mora Seró is a lecturer in the Department of Physics of the Universitat Jaume I and main researcher of the Advanced Semiconductor Group (GAS) of the University Institute of Advanced Materials. His research has focused on the growth of crystals, nanostructured devices, the properties of transport and recombination, photocatalysis, and the electrical characterization of photovoltaic, electrochromic and water division systems, both with experimental and theoretical work. His recent research activity focuses on new concepts for photovoltaic conversion and light emission (LED and light amplifiers) based on nanometric devices and semiconductor materials following two main lines: semiconductor quantum dots and halide perovskites. This last line is probably the most advanced in the development of new optoelectronic devices. In the 2016 call, Mora Seró obtained a two million euros Consolidator Grant from the European Research Council (ERC) to develop his No Limit project for five years.

**Reference:**

Bruno Clasen Hames, Iván Mora-Seró i Rafael S. Sánchez “Device performance and light characteristics stability of quantum-dot-based white-light-emitting diodes” Nano Research, 11, (2018) 1575–1588

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