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LpR Article | Technologies | Oct 07, 2016

MOCVD Platform for Cost-Effective Production of GaN-based HB LEDs

MOCVD Platform for Cost-Effective Production of GaN-based HB LEDs GaN-based blue and ultraviolet light emitting diodes (LEDs) are steadily becoming more widely used in solid-state lighting (SSL) applications [1-3]. Enabling dramatic energy savings when compared to contemporary incandescent bulbs and fluorescent lamps, these high-brightness LEDs (HB-LEDs) have a market potential in the billions of dollars. Yole Development estimates that by 2017, the market for LEDs will be approximately $75 billion [4, 5]. Shiping Guo, the Senior Technology Director of Advanced Micro-Fabrication Equipment Inc. presents a new approach to support this goal with a cost effective MOCVD solution for HB-GaN LED manufacturing. Read more »

LpR Article | Technologies | Sep 30, 2016

OLED Technology in Lighting Applications

OLED Technology in Lighting Applications Prototypes and niche applications with OLEDs for lighting have been demonstrated over the past few years. Now there are indications that OLED technology is ready for mass production or at least will be ready very soon. Franco Musiari, Technology Specialist at ASSODEL analyzed the current status and future perspectives of OLED technology. Read more »

LpR Article | Technologies | Sep 12, 2016

LED and Lens Degradation Through Volatile Organic Compounds

LED and Lens Degradation Through Volatile Organic Compounds In general, LEDs are very resistant light sources. Nevertheless, glues, conformal coatings, o-rings, gaskets, and potting compounds, all materials that are frequently used in the construction of LED based luminaires or lamps and often contain volatile organic compounds (VOCs) may have a negative impact on performance, reliability and lifetime. Edward Steinke, application engineer at Cree, explains the set of problems and how to prevent these issues based on Cree’s products, using their test kit components, as well as components for lamp and luminaire applications. Read more »

Technologies | OLEDs | Flexible OLEDs | Sep 09, 2016

Researchers Propose Graphene Anode for Flexible OLEDs

Researchers Propose Graphene Anode for Flexible OLEDs In their research article, Tae-Hee Han, Min-Ho Park, Sung-Joo Kwon, Sang-Hoon Bae, Hong-Kyu Seo, Himchan Cho, Jong-Hyun Ahn and Tae-Woo Lee from the Pohang University of Science and Technology and the Yonsei University in Korea respectively investigated the use of praphene anodes for ultra-flexible OLED devices. The original article, "Approaching Ultimate Flexible Organic Light Emitting Diodes Using a Graphene Anode", is published in NPG Asia Materials (2016) 8, e303; doi:10.1038/am.2016.108 online on September 9, 2016. Read more »

Lp Article | Technologies | Sep 06, 2016

LightSpeed Experience Center

LightSpeed Experience Center On August 26th, 2016 the editors of LED professional Review were invited by EBV Elektronik to visit their newly established “LightSpeed Experience Center” in Poing near Munich. It’s a very special meeting center, where you can view advanced and future technologies in the optoelectronics world. You could call it a tech incubator and think tank that enables innovation and creativity to combine. Read more »

LpR Article | Technologies | Medical | Aug 22, 2016

High-End White Light Sources Fiber Optics Technology for Medical Applications

High-End White Light Sources Fiber Optics Technology for Medical Applications Often technologies that are too expensive for the mass market at the beginning are already adopted in medical applications. When reaching a certain level of maturity, costs usually become more reasonable and adaptations for the consumer market begins. Holger Laabs, Oliver Mehl and Henning Rehn from Osram GmbH present a light source technology and its prerequisites for fiber optics that could become one of these technologies. Read more »

LpR Article | Technologies | Aug 15, 2016

Concepts to Overcome Lifetime Issues of LED Drivers

Concepts to Overcome Lifetime Issues of LED Drivers Lighting technology has changed significantly in recent years after a century of little to modest advancements. LED luminaires offer advancement in lower power consumption and expected life. Maggie Nadjmi, EE Product Manager at SL Power Electronics, explains why this new technology will probably not meet the life and reliability expectations if no attention is paid to the drivers and power supplies used to power LEDs. She discusses the main components affecting lifetime and how to eliminate them or design a product to still achieve the desired lifetime. Read more »

LpR Article | Technologies | Aug 05, 2016

Reliability Oriented Design of LED-Based Light Sources

Reliability Oriented Design of LED-Based Light Sources The transition from traditional light sources to SSL systems requires a different design philosophy to achieve the advantages offered by LED light sources. The key approach is based on the parallel design of thermal, electrical, optical and spectral properties of the light source. Matteo Meneghini, Gaudenzio Meneghesso, Enrico Zanoni and Matteo Dal Lago from the Department of Information Engineering at the University of Padova, and Nicola Trivellin from LightCube SRL explain this approach including the importance of the electrical management of LEDs, comparing modulation techniques to constant current, differentiating between versatility and efficiency. Read more »

LpR Article | Technologies | Jul 28, 2016

InGaN Nanowires Make Light Mixing Efficient and Smart

InGaN Nanowires Make Light Mixing Efficient and Smart The correlated color temperature (CCT) of high color rendering index (CRI) LED lighting systems can, in principle, be tuned over a wide range. As an alternative approach to conventional phosphor based LEDs, a full-color LED array consisting of red, green and blue (RGB) InGaN based nanowire LEDs monolithically integrated on a micro-scale level has been proposed and fabricated. J. Lee from the Nano Electronics Lab at the Samsung Advanced Institute of Technology, Renjie Wang, Hieu P. T. Nguyen, Ashfiqua T. Connie, Ishiang Shih, and Zetian Mi from the Department of Electrical and Computer Engineering at McGill University in Montreal explain how this technology works and how the three multi-color subpixels on the same chip can be separately biased and can exhibit full-color emission which can be tuned controllably in a wide CCT range. Read more »

LpR Article | Technologies | Jul 18, 2016

Mastering Thermal Issues in LED PCB Design & Laminate Selection by Ventec Europe

Mastering Thermal Issues in LED PCB Design & Laminate Selection by Ventec Europe LED applications are not the only applications that are driving the need for thermal issues to be considered and mastered in PCB design, but they are certainly amongst the most challenging. Designing LED PCBs requires many considerations and key are those that arise from multiple heat sources in close proximity. Martin Cotton, Director OEM Technology of Ventec Europe describes the process and criteria used when designing PCBs (Printed Circuit Boards) for use in LED applications using thermally conductive IMS (Insulated Metal Substrates). He goes into technical detail with charts and diagrams that explain everything the designer would need to consider when selecting a laminate and commencing a design. Read more »

Technologies | Thermal Management | Jul 14, 2016

Engineered “Sand” May Help Cool Electronic Devices and LEDs

Engineered “Sand” May Help Cool Electronic Devices and LEDs Giorgia Tech Research reports that Baratunde Cola, associated professor at the George W. Woodruff School of Mechanical Engineering at the Georgia Institute of Technology, would like to put sand into your computer and other electronic devices. Not beach sand, but silicon dioxide nanoparticles coated with a high dielectric constant polymer to inexpensively provide improved cooling for increasingly power-hungry electronic devices. Read more »

Technologies | LEDs | Light Generation | Quality | Jul 12, 2016

The Right Light for Fashion Retail, Fresh Food and Restaurants - More than just CCT and CRI

The Right Light for Fashion Retail, Fresh Food and Restaurants - More than just CCT and CRI Lumileds recently introduced their Luxeon Stylist Series to support fashion, retail, fresh food sales and restaurants. Lumileds calls their proprietary technology for CoB LEDs CrispWhite Technology, CrispColor Technology™, FreshFocus Technology™ and AtmoSphere Technology™ depending on the focus. In preparation for the product release, Rick Hamburger, Senior Director of Product Management, Eric Senders, Product Line Director CoB, Luis Acena, Senior Manager, Luxeon Stylist Series, Kevin Lucido, Senior Director of Global Marketing Communications discussed the technology and features of the new product series with Arno Grabher-Meyer from LED professional. Read more »

LpR Article | Technologies | Jul 07, 2016

New Class of Siloxane Polymers for Advanced LED Packaging

New Class of Siloxane Polymers for Advanced LED Packaging Packaging presents a major challenge to further improve LED device efficiency and reliability. A novel class of high stability siloxanes forms a technology platform to address such opportunities in die attach, encapsulation, and light outcoupling applications. Dr. Juha Rantala, CEO & Founder, Dr. Joerg Rockenberger, Director Application & Business Development, Dr. Jyri Paulasaari, Vice President Technology, Dr. Jarkko Heikkinen, Director Inks & Pastes. Markus Laukkanen, Application Manager, and Dr. Janne Kylmä, Vice President Engineering & Production at Inkron Oy explain the material properties and give examples of how these new materials in combination with novel nanomaterials enable products fully compatible with current process tools and flows while having superior properties. Read more »

LpR Article | Technologies | Jul 06, 2016

LED Light Spectrum Enhancement with Transparent Pigmented Glazes

LED Light Spectrum Enhancement with Transparent Pigmented Glazes While LED bulbs have the distinct economic advantages of using less energy, producing less heat and lasting years longer than traditional incandescent bulbs, when objects are viewed under LED light, they frequently appear to be of different colors than when viewed in sunlight or with incandescent lights. Jan-Marie A Spanard from Light Spectrum Glazes proposes and explains an approach to optimize the spectral distribution of LED light to overcome this weakness. Read more »

LpR Article | Technologies | Jul 01, 2016

How Silicones are Evolving to Meet the Growing Needs of the LED Lighting Industry by Dow Corning

How Silicones are Evolving to Meet the Growing Needs of the LED Lighting Industry by Dow Corning There are different materials for optics in lighting applications. The lighting application engineers François de Buyl, Martijn Beukema and Kevin van Tiggelen from Dow Corning are convinced that silicone’s unique qualities help to expand options in the design and molding of LED packaging components, as well as components for lamp and luminaire applications. Read more »

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