A 'sand' LED produces white light like the sun

A 'sand' LED produces white light like the sun https://i1.wp.com/www.eresviral.com/wp-content/uploads/2018/10/Un-LED-de-‘arena’-produce-luz-blanca-como-la-del-sol.png?fit=260%2C40&ssl=1

A 'sand' LED produces white light like the sun







The high blue light content of current LEDs can be harmful to the human retina, especially for children, and has a negative impact on brain chemistry.



Now the researchers Rubén Costa of the IMDEA Materials Institute of Madrid (Spain), Elena Lalinde and Jesús Berenguer of the University of La Rioja, together with Javier García of the University of Alicante, have managed to produce silica nanoparticles - a material similar to sand - that emit high quality white light for a new generation of hybrid LEDs.



By eliminating blue light, this sand avoids the health risks of current LEDs. The development of new silica nanoparticles that emit light is one of the most competitive fields and with more applications in the investigation of new sources of artificial light, since in addition to reducing the negative impact on sight, they can be manufactured more respectfully with environment.



"These materials have been developed over the last few years, but never before had white light from a single nanoparticle been achieved", underlines Costa. "It's a new milestone in artificial lighting: the manufacture of LEDs that emit light similar to the sun made with sand derivatives that are luminescent, the silica nanoparticles."







White LED manufactured with a color filter based on white emitting sand. (Photo: IMDEA Materials)



University researchers from La Rioja and Alicante have offered their experience in the use of coordination chemistry, specifically a technique called sol-gel that allows to prepare metal oxides with new properties.



For its part, the Costa team, one of the international leaders in the design of luminescent devices such as LED and the development of photovoltaic energy, contributes its research on the properties of these oxides.



The fundamental contribution of this work is that it has managed to produce white light, which stands out for its stability, excellent quality and that does not harm the eyesight. Until now, other scientists have managed to produce similar materials that emit green, blue or red light, but not white, which is the key color for future exploitation.



In addition, the LEDs prepared with this new material present a stability record well above those previously developed in other colors. The light emitted by these new diodes is very similar to sunlight, which also makes it more healthy.



The practical interest of this white light emitting sand is that it could replace the current color filters based on rare earths such as yttrium, whose extraction and exploitation cause important negative effects on the environment.



The work of this team of Spanish pioneers has been published in the journal Materials Horizons, one of the most important international scientific journals in the field of new material applications. (Source: IMDEA Materials Institute)

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