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    New Red Phosphor to Improve LED Energy Efficiency Co-Developed by University of Innsbruck and Osram

    New Red Phosphor to Improve LED Energy Efficiency Co-Developed by University of Innsbruck and Osram

    Source： ledinside.com 06 May 2019
    Osram Opto Semiconductors，LED researchred phosphor，University of Innsbruck

    A research team at the University of Innsbruck, Austria cooperated with Osram Opto Semiconductors to develop a new red phosphor with excellent luminescence properties which can make LED lighting more energy-efficient. The research article, titled “Sr[Li2Al2O2N2]:Eu2+—A high performance red phosphor to brighten the future” was published in Nature Communications on April 23, 2019.

     

    The scientists created the new red phosphor whose light is well perceived by the eye as the human eye is more sensitive to green and less sensitive to blue and red. With the development, the light yield of white LEDs can be improved by around one sixth, helping to improve the energy efficiency of lighting systems.

     

    The powerful red phosphor Sr[Li2Al2O2N2]:Eu2+, named SALON by the researchers, meets all the requirements for the optical properties of a phosphor. The development goes back to research carried out by Hubert Huppertz at the University of Bayreuth. As part of his doctoral thesis, he developed nitrides doped with europium that are fluorescent. These red phosphors are partly responsible for the fact that LEDs no longer only glow cold white, but also warm white. Interestingly, the human eye reacts most sensitively to the color green. In the blue and red areas, the eye is less sensitive. Although these phosphors emit red light in the visible range, a large part of the energy goes into the infrared range, which the human eye does not perceive. The fluorescent material developed in Innsbruck has now succeeded in slightly shifting the light emission from red towards blue.

     

    New Red Phosphor to Improve LED Energy Efficiency Co-Developed by University of Innsbruck and Osram

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    Héctor Esrawe Introduces Félix Candela's Parabolas Into Lighting Design

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    New Red Phosphor to Improve LED Energy Efficiency Co-Developed by University of Innsbruck and Osram

    A research team at the University of Innsbruck, Austria cooperated with Osram Opto Semiconductors to develop a new red phosphor with excellent luminescence properties which can make LED lighting more energy-efficient. The research article, titled “Sr[Li2Al2O2N2]:Eu2+—A high performance red phosphor to brighten the future” was published in Nature Communications on April 23, 2019.

    Tunable white lighting in the classroom: The new ROI is ROO

    Throughout the past few years, we at LEDs Magazine have seen more solid-state lighting (SSL) product development targeted at educational environments. School officials, especially in the public-school arena, must manage strict budgets and plan strategically to obtain the best return on investment (ROI) possible, so the potential financial implications are important factors — first, the cost of premium equipment and installation, but then balanced against the possible payback due to energy efficiency initiatives and less maintenance. One consideration beyond the established cost reductions of SSL in institutional buildings such as schools is the possible impact of tunable white lighting in the classroom. Naturally, dimmability and other controls features such as granularity of color temperature can be customized to various classroom tasks and increase visual acuity. But what’s becoming even more appealing to educational administrators is the ability to influence less “visible” factors in the classroom, such as mood, behavior, and concentration. Strategies in Light, co-located with The LED Show and Lightspace California, will draw more attention to so-called human-centric lighting applications as this, also known as lighting for health and wellbeing. One such presentation, “Lighting for pupils…Tunable white lighting in the classroom and the new ROI,” by Tricia Foster of Acuity Brands Lighting and Catherine Hollenshead of Estes, McClure & Associates (EMA), will feature a case study on a Texas school district’s first-hand experience using tunable white lighting in several classrooms. Here the speakers give a glimpse into the new classroom experience. They will offer up additional details during SIL on how ROI has evolved into “return on objective” (ROO) in such installations. — Carrie Meadows

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