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WP32 Narrow Red Phosphor Technology White Paper 20161202 ©2016 Lumileds Holding B.V. All rights reserved. WHITE PAPER Narrow Red Phosphor Technology An approach to enable high efficacy high color rendering performance LEDs for illumination Introduction With increasing availability and quality, LEDs are widely used for solid state lighting (SSL). While LEDs have improved tremendously in efficacy and cost over the past decade, they must also meet end user expectations in other aspects in order to expand market penetration and realize the full energy saving potential of SSL in illumination applications. One key attribute is color rendering, which describes how “true” the colors of objects look under the light source in comparison to how they look when illuminated by a reference light source. The higher the color rendering index (CRI), the better the color rendering abilities of a light source. Typically, a general CRI, also denoted by Ra, of 80 and above is considered to represent good color rendering and is recommended for most indoor lighting applications. Retail and other high end lighting applications even require above Ra>90 for more attractive merchandise and an inviting and hospitable environment for customers. State-of-the-art LED lamps and luminaires are predominantly based on phosphor- converted LEDs (pc-LEDs). Because of the broad bandwidth of the phosphors used in these LEDs, a significant portion of the light is emitted in regions where the eye has little sensitivity. This portion becomes larger as the CRI increases, because a higher CRI puts more stringent demands on the amount of light emitted in the red- to-orange wavelength range at the edge of the visible spectrum. As a result, lamps or luminaires made with 90 CRI LEDs are considerably less efficient than those made with 80 CRI LEDs and often do not exceed fluorescent lamps in efficacy. In order for adoption to increase, for all practical purposes, the efficacy of 90 CRI LEDs must increase substantially. Increasing LED efficacy is also essential to reducing the cost of LED lamps or luminaries. It not only reduces the number of LEDs and/or power required per LED, but also the amount of power that the driving electronics must deliver, the size of the optics that shape the light beam, and the amount of heatsinking required to dissipate the energy that is not converted to light. Hence, increasing efficacy of 90 CRI LEDs enables substantial cost decreases for the lamps or luminaires, which will further accelerate market adoption of SSL. Lumileds Narrow Red Material LUXEON 3030 2D, an example of an LED using Lumileds Narrow Red Phosphor Technology
©2016 Lumileds Holding B.V. All rights reserved. LUXEON is a registered trademark of the Lumileds Holding B.V. in the United States and other countries. lumileds.com Neither Lumileds Holding B.V. nor its affiliates shall be liable for any kind of loss of data or any other damages, direct, indirect or consequential, resulting from the use of the provided information and data. Although Lumileds Holding B.V. and/or its affiliates have attempted to provide the most accurate information and data, the materials and services information and data are provided “as is,” and neither Lumileds Holding B.V. nor its affiliates warrants or guarantees the contents and correctness of the provided information and data. Lumileds Holding B.V. and its affiliates reserve the right to make changes without notice. You as user agree to this disclaimer and user agreement with the download or use of the provided materials, information and data. WP32 Narrow Red Phosphor Technology White Paper 20161202 About Lumileds Lumileds is the global leader in light engine technology. The company develops, manufactures and distributes groundbreaking LEDs and automotive lighting products that shatter the status quo and help customers gain and maintain a competitive edge. With a rich history of industry “firsts,” Lumileds is uniquely positioned to deliver lighting advancements well into the future by maintaining an unwavering focus on quality, innovation and reliability. To learn more about our portfolio of light engines, visit lumileds.com.