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    Online Exclusives

    Don’t Feel Blue About Your Lighting

    OLEDWorks helps consumers see the light regarding the benefits of organic light-emitting diodes.

    Don’t Feel Blue About Your Lighting
    OLEDWorks' OLEDWorks Wave Watermark.
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    David Savastano, Printed Electronics Now09.26.19
    The lighting industry is undergoing radical changes. The incandescent bulbs and fluorescent tubes are out of favor for a variety of reasons, including cost and waste. One alternative is light-emitting diode (LED) lighting, but there are concerns. The blue region (400-400nm) of the visible spectrum, called high-energy blue light, is emitted by the sun and everyday household electronic devices such as computer screens, tablets, smartphones, televisions and even light bulbs. This blue light has relatively high energy and a longer wavelength than UV light, which can penetrate deeper within skin tissue than UV light. Blue light can induce cytotoxicity in cells, decreasing their proliferation. Moreover, blue light generates reactive oxygen species in skin, and these ROS lead to a loss of elasticity, dryness, fine lines and photoaging, according to experts.
     
    No wonder why cosmetic chemists are creating raw materials and finished skin care products that reduce the damage caused by “blue” light. While formulators create the next generation of blue-light-blocking creams and lotions, the electronics industry has created an alternative light source; the organic light-emitting diode (OLED). Rochester, NY-based OLEDWorks sees opportunities for OLEDs, as head-to-head comparisons with LEDs have generally favored OLEDs. 
     
    “Because human-centric lighting is a focus now, the interest in OLED lighting is rapidly growing,” David DeJoy, co-founder and chairman of OLEDWorks, noted. “OLED is by its nature a healthy light source.”
     
    OLEDWorks CTO Dr. Michael Boroson observed that OLEDs are fundamentally different from LEDs. 
     
    “OLED is a naturally diffuse large area light source compared to point sources such as LEDs and light bulbs or line sources like fluorescent tubes,” Boroson said. “Light is generated by whole surfaces, which provides a soft, even glow; it’s not high-intensity. LEDs start with generating high-brightness blue light then use phosphors to convert some of that blue to other colors. OLEDs have multi-colored emitters and keep the blue light content at a level that’s just what is needed to create white lighting. LEDs generate a ton of light in a tiny chip, so manufacturers must use diffusers or place lights high up into ceilings so the light isn’t as glaring.”
     
    “In theory, OLED and LED are complementary technologies,” DeJoy noted. “One is a point source, the other is an area source. It is really not an either-or (question). You have to choose the right technology for each application, and they can be used in combination.”
     
    “High intensity blue light has a number of impacts on human beings, including on melatonin production, sleep cycles and macular degeneration,” Boroson observed. 
     
    There have been countless conversations about the blue light content in OLED and how it compares to LED. Boroson noted that in IEC 62471 photobiological safety testing, OLEDWorks lighting panels are rated exempt from any risk of hazards for the human skin and eye in the blue, UV or IR wavelengths. 
     
    “Combined with low glare, no flicker, naturally diffuse light and excellent color rendering, OLED is a uniquely healthy light solution for physical and emotional wellbeing,” he explained in a recent presentation.
     
    “It is hard to quantify OLED lighting’s benefits because no single measurement describes the full effect,” Boroson added. “A Department of Energy (DoE) OLED Gateway Project involved a lighting installation comprising 50% OLED lighting and 50% LED lighting at an accounting firm in Rochester. The white paper written by the DOE was very positive, but the major impact of the project is that companies such as Wegman’s and local banks that have seen the Gateway Project site are switching to OLED. We expect to see continued expansion as more and more people see it.” 
     
    “It is kind of like the winter blues up here in Rochester,” John Holland, OLEDWorks chief revenue officer, added. “You don’t know why you’re feeling down, and then you feel better when the sun comes out and the spring season breaks. We can’t describe it, but that’s the way people feel under OLED lighting.”
     
    DeJoy said that the glare from LED light bulbs can be jarring.
     
    “I bought an LED fixture for our kitchen a few years ago and put it in the kitchen, and the second I turned it on my wife told me to take it out,” he said. “A space lighted with OLED sells our technology. Our biggest burden is communicating the experience of OLED lighting, how it feels.”
     
    OLEDWorks and OLEDs have come a long way since Kodak discovered OLED technology in the late 1970s and early 1980s, advancing OLED technology before the company exited the OLED business in 2009.
     
    “A small group of former Kodak employees started OLEDWorks in 2010,” DeJoy said. “We acquired Philips’ OLED division in 2015, and combined the teams, manufacturing facilities and IP.” 
     
    OLEDWorks produces the light engines and partners with key companies in the automotive and general lighting industries to integrate OLEDs into their products.
     
    “We have a very close working relationship with Acuity Brands, which currently has eight OLED fixtures in its portfolio that are designed to be affordable,” said DeJoy. Acuity Brands announced earlier this year their plans to expand on their OLED portfolio under an exclusivity deal with OLEDWorks.
     
    OLED lighting is conformable and can be produced on flexible substrates, which is a benefit for designers. The transportation market, including automotive, aerospace and trains, is one area that OLEDWorks is exploring, from tail lights to interior lighting. 
     
    “With the move to driverless cars, the interior space will become more like a living space or an office space, increasing the need for high quality human-centric white lighting,” Dr. Boroson added.
     
    “OLEDs take weight out of the vehicle and decrease power consumption,” DeJoy reported. “We are selling a lot into the automotive segment. The demand for OLED in automotive is increasing significantly,  mostly for exterior in red.Some automotive companies are already using hybrid OLED-LED tail lights. Audi, BMW and Mercedes all have rear combination lights using both OLEDs and LEDs.”
     
    Along those lines, in May, OLEDWorks announced a predevelopment collaboration with Audi to advance OLED lighting in automotive applications using the OLEDWorks technology platform.
     
    “We’re pleased that Audi confirms the market readiness of our OLED lighting technology for the quality requirements of the automotive marketplace,” said DeJoy. 
     
    There are other possibilities ahead for OLEDWorks. “We can produce meaningful amounts of light on a single panel,” said DeJoy. “We are also producing flexible OLED panels that are made on conformable glass.” 
     
    “Lighting has been for the longest time an ‘it’ – it’s been about brightness, it’s been about efficiency. Now light quality plays a larger role in purchasing and design decision,” Dr. Boroson concluded. “Awareness is growing, and experience is key to creating desire. This premium, high quality light source is where the market is going to go.”
     
    If companies and consumers go all-in on OLED, blue-light claims may get redlighted. 



    About the Author
    David Savastano is editor of Ink World and Printed Electronics Now; both are Rodman Media titles. 
     
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