Trends

Trends

LpR Article | Research | Jun 08, 2016
A Graphene-Based, Spectrally Tunable, Flexible Field-Effect Light-Emitting Device by the Tsinghua University and the Tsinghua National Laboratory for Information Science and Technology
A Graphene-Based, Spectrally Tunable, Flexible Field-Effect Light-Emitting Device by the Tsinghua University and the Tsinghua National Laboratory for Information Science and Technology The continuous tuning of the emission spectrum of a single light-emitting diode (LED) by an external electrical bias is of great technological significance as a crucial property in high-quality displays and may be used in high quality lighting applications, yet this capability has not been demonstrated in existing LEDs. Graphene, a tunable optical platform, is a promising medium to achieve this goal. Xiaomu Wang, He Tian, Mohammad Ali Mohammad, Cheng Li, Can Wu, Yi Yang, and Tian-Ling Ren from the Institute of Microelectronics at the Tsinghua University in Beijing and the Tsinghua National Laboratory for Information Science and Technology (TNList) demonstrate a bright spectrally tunable electroluminescence from blue (~450 nm) to red (~750 nm) at the graphene oxide/reduced-graphene oxide interface. Read more »
LpR Article | Technologies | Jun 08, 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 »
LpR Article | Research | Jun 07, 2016
Al2O3 Coated Europium- Activated Aluminum Silicon Nitride for COB LED Technology by the Graz University of Technology and Tridonic Jennersdorf
Al2O3 Coated Europium- Activated Aluminum Silicon Nitride for COB LED Technology by the Graz University of Technology and Tridonic Jennersdorf Eu2+ activated nitride phosphors have drawn much interest for solid state lighting because of their interesting photoluminescence. While they show excellent optical properties, they are hygroscopic and have the potential of being degraded by atmospheric moisture and high temperatures. A coating layer on the surface is an effective method to improve stability against moisture and oxidation. For use in chip on board technology, Nika Mahne, master student at the Institute of Inorganic Chemistry, A. Reichmann, B. Bitschnau, R. Fischer, from the Graz University of Technology, and F. Schrank from Tridonic Jennersdorf propose an approach where a CaAlSiN3:Eu2+ [1, 2, 3] phosphor was coated with Al2O3, obtained via a Brønsted precipitation reaction based on a solution-coating process from a mixture of aluminum halide with a base after annealing at a temperature of 400°C. Read more »
LpR Article | Technologies | Jun 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 | Research | Jun 07, 2016
Flexible OLEDs for Lighting Applications by the Holst Centre
Flexible OLEDs for Lighting Applications by the Holst Centre While OLEDs already have successfully found their way into display applications, the breakthrough in lighting applications is still pending. The reasons are diverse, but cost is one major point. Another reason is the current edge of inorganic LEDs giving reasonable design opportunities in many standard applications. However, there are applications where OLEDs could score, especially the flexible OLEDs. But even these OLEDs need to become cheaper to be applied widely. The Holst Centre and partners aim to develop generic technologies for large area flexible OLEDs which can be processed with roll-to-roll (R2R) technology. Process Engineer Tansim Baig gives an example and an overview of the current status of the development. Read more »
LpR Article | Trends | Jun 06, 2016
Embedded Lighting - Developing New Lighting Applications for Modern Architectural Projects by Philips Lighting
Embedded Lighting - Developing New Lighting Applications for Modern Architectural Projects by Philips Lighting When the era of LED lighting started, everybody talked about the new age of lighting with new opportunities. While many lighting concepts are still pure replacements of the conventional light sources, with the maturation of this technology, more and more new concepts are realized, and the future perspectives are even more exciting. Brad Koerner, Venture Manager - Philips Luminous Patterns at Philips Lighting, shows examples, explains why such new concepts are desirable, and discusses which technologies support the introduction of new lighting applications. Read more »
LpR Article | Research | Jun 03, 2016
Luminescent Glasses and Glass Ceramics for White Light Emitting Diodes by the Fraunhofer Institute and the South Westphalia University of Applied Science
Luminescent Glasses and Glass Ceramics for White Light Emitting Diodes by the Fraunhofer Institute and the South Westphalia University of Applied Science Luminescent glasses or glass ceramics represent an interesting alternative to LED phosphor due to their high thermal and chemical stability. A series of rare-earth doped glasses are investigated for their potential application as photon converters for solid-state lighting applications. Franziska Steudel, Sebastian Loos, Bernd Ahrens, and Stefan Schweizer from the Fraunhofer Institute and the South Westphalia University of Applied Science respectively, show that the color coordinate of double-doped glass can be varied over a broad spectral range by changing the rare-earth doping ratio accordingly. In addition, double-doping allows for a change in the color coordinate by using different excitation wavelengths. Read more »
LpR Article | Technologies | Jun 03, 2016
Cost and Performance Optimization of Thermal Management Solution for High Power LEDs by Cambridge Nanotherm
Cost and Performance Optimization of Thermal Management Solution for High Power LEDs by Cambridge Nanotherm The LED industry has a challenge. General lighting requires very bright LEDs that can replace incandescent and halogen lights. Manufacturers need efficacy, cost and manufacturability to be “just right” but most leading solutions, especially in thermal management, are short of the mark. Giles Humpston, applications engineer, Cambridge Nanotherm, discusses ways to combine performance with reasonable costs and good manufacturability. Read more »
Resources | LpR Article | Event-Reports | Trends | May 30, 2016
Light + Building Post Show Report: The Six Most Noteworthy Observations by LED professional
Light + Building Post Show Report: The Six Most Noteworthy Observations by LED professional In the weeks and months before the show it was obvious that the major topics were going to be IoT and connectivity. There are many reasons for this. One is that LED lighting has become established but the big deals for smart lighting and human centric lighting are missing. IoT seems to be the way to improve communication and enable both smart lighting and HCL. Arno Grabher-Meyer from LED professional gives a summary of his impressions of the fair in regards to these topics, and beyond. Read more »
LpR Article | Research | May 24, 2016
Thin-Film Light Management System for Intelligent Large-Area LED Luminaires by the Centre Suisse d’Electronique et de Microtechnique SA
Thin-Film Light Management System for Intelligent Large-Area LED Luminaires by the Centre Suisse d’Electronique et de Microtechnique SA The recent advances in Solid State Lighting have triggered the development of smart lighting solutions. However, the point-like nature of LEDs imposes the use of inefficient and/or bulky light scattering sheets or costly, short-pitch LED arrays to achieve acceptable spatial luminance uniformity. Ph.D. Oscar Fernandez, Senior R&D Engineer at the Centre Suisse d’Electronique et de Microtechnique SA (CSEM) shows a new approach in the form of an innovative thin form-factor light management (LM) system comprising a highly engineered combination of thin-film diffractive nano-optical and refractive micro-optical elements. Read more »
Resources | Fundings | EU-Calls | Technologies
EU Call: FET-Open Research and Innovation Actions
This call is open for any kind of research on future and emerging technologies (FET) in early stages. Proposals should cover high-risk, interdisciplinary research on radically new technologies. Read more »
LpR Article | Technologies | May 24, 2016
Create Colorful and Bright LED Light with an LED Matrix Dimmer by Linear Technology
Create Colorful and Bright LED Light with an LED Matrix Dimmer by Linear Technology RGB LEDs are quite common and used in many applications today. More advanced multi-color solutions like RGBW, RGBA or RGBWA offer huge advantages over RGB solutions, but several aspects are more complicated. Keith Szolusha, applications engineering section leader for power products at Linear Technology explains the advantages of RGBW systems, how they work, how to set up such systems, and how to drive them correctly using Linear Technology’s LT3965 8-switch LED matrix dimmer in combination with the LT3952 boost-buck LED driver as an example. Read more »
Technology | May 20, 2016
LED Lighting: All Eyes on Flicker by Tridonic
LED Lighting: All Eyes on Flicker by Tridonic Flicker was a familiar problem with early fluorescent lamps. However, increasingly powerful electronic control gear has largely offset these interferences over time, banishing them from current perception. Since LEDs (light-emitting diodes) have become established in all areas of lighting, including general lighting, flicker has reemerged. LED Drivers play a key role in producing light that is as flicker-free as possible. Read more »
LpR Article | Technologies | May 19, 2016
3-Pad LED Flip Chip COB by Flip Chip Opto
3-Pad LED Flip Chip COB by Flip Chip Opto Wafer level packaging and flip chip design are the most recent trends in LED manufacturing and packaging. These LED types are perfectly suited for producing COB modules. This combination already promises better thermal performance than standard SMD package based products. However, there is still room for improvements. Pao Chen, Director of Research and Development at Flip Chip Opto shows how a 3-pad flip chip LED further reduces thermal resistance, allows higher power and can help to reduce costs. Read more »
LpR Article | Research | May 17, 2016
Human-Focused Outdoor Illumination: Trade-Off Between Pleasing Color and Circadian Action, by the Vilnius University
Human-Focused Outdoor Illumination: Trade-Off Between Pleasing Color and Circadian Action, by the Vilnius University A smart RGBA solid-state light engine with tunable correlated color temperature (CCT) and high-fidelity color rendition was applied for the validation of the Kruithof hypothesis in several outdoor environments. Subjects were asked to find the most “pleasing” illumination conditions by performing a CCT adjustment. Maintaining constant illuminance, the mean selected CCT was found to increase from about 3000±200 K at 5 lx to about 3500±250 K at 50 lx almost independently of the content of the viewed scene. Dr. Pranciškus Vitta, Head of Lighting and Electronics System Lab at the Vilnius University shows that this increase is statistically significant and provides qualitative validation of the Kruithof hypothesis in outdoor environments, but with the intervals of CCT for “pleasing” illumination, it is substantially broader and shifted to higher values. Read more »
Technologies | OLEDs | Light Conversion | May 13, 2016
Research on OLEDs with Ultrathin Emissive Layers and a Spacer-Free Structure
Research on OLEDs with Ultrathin Emissive Layers and a Spacer-Free Structure Since C.W Tang demonstrated the first organic light-emitting diodes (OLEDs) based on a double-layer structure of organic materials in 1987, flat-panel displays and lighting applications based on OLED technology have grown dramatically because of their attractive features such as ultra-thin structure, light-weight and flexibility. To achieve a desirable OLED performance, a host-dopant system is adopted. This not only leads to an increase in material cost and device processing time, but also makes it difficult to control dopant concentration accurately. Therefore, OLEDs with dopant-free and ultrathin emissive layers (UEMLs) have aroused much attention. Shengfan Wu, Sihua Li, Qi Sun, Chenchao Huang & Man-Keung Fung recently published the results of their research on such ultrathin emissive layers (UEMLs) of phosphorescent materials for OLED applications. Read more »
Laser Technology | Products, Materials + Tools | Apr 05, 2016
Osram is Demonstrating Phaser Laser Technology for the Entertainment Sector
Osram is Demonstrating Phaser Laser Technology for the Entertainment Sector Spotlights provide the right illumination for actors in front of the camera and on the stage, put concerts and other events in the right light and are the main tool for lighting designers looking to create spectacular effects. A special highlight from Osram at Prolight + Sound 2016 is the next generation of entertainment lighting based on laser technology. The Osram booth (E50 in Hall 3.0) features not only the Kreios Profile and Fresnel luminaires but also the new versions of the familiar and improved Lok-it! Power Series and the SplitStar S32, an innovative RGBW multi-chip LED module. “As a pioneer in laser technology we are delighted to be showing this technology in action for entertainment lighting, creating yet another milestone in this sector”, explained Hans-Joachim Schwabe, CEO Specialty Lighting at Osram. “What’s more, visitors to our booth and to the booth of our subsidiary Clay Paky can see more products for the entertainment sector and the first results of our close cooperation.” Read more »
Technologies | Smart Lighting + IoT | Apr 05, 2016
The “Internet of Light” – the Key to the “Internet of Things”
The “Internet of Light” – the Key to the “Internet of Things” The Internet of Things is the next industrial revolution. As a specialist for innovative lighting components and systems, Tridonic is convinced that lighting will play a decisive role in the Internet of Things (IoT). Therefore, Tridonic developed the toolbox net4more which will not only connect luminaires with each other, but deliver an added value that goes far beyond lighting. Where do we stand today? Read more »
Technologies | LEDs | White LEDs | Feb 25, 2016
Cree Announces Outstanding R&D LED Efficacy Combined with Superior Color Quality
Cree Announces Outstanding R&D LED Efficacy Combined with Superior Color Quality Cree, Inc. records another LED industry first with the demonstration of a single high-power LED delivering nearly 1,600 lumens at 134 lumens-per-watt (LPW) with similar color quality as an incandescent light bulb. With this result, Cree achieved a breakthrough 25 percent increase in lumens per watt (LPW) over production LEDs of similar color quality under operating conditions found in real-world LED lighting applications. This important milestone coupled with Cree’s latest SC5 Technology™ platform will lead to LED systems with increased performance, lower cost and better light. Read more »
Technologies | LEDs | GaN-on-Si | Jan 18, 2016
Plessey Builds LEDs in Cubic GaN on 3C-SiC/Si To Overcome The Green Gap
Plessey Builds LEDs in Cubic GaN on 3C-SiC/Si To Overcome The Green Gap Plessey, Anvil Semiconductors and the University of Cambridge announced today that they are working together to fabricate high efficiency LEDs in cubic GaN grown on Anvil's 3C-SiC / Si substrates. Cubic GaN has the potential to overcome the problems caused in conventional LEDs by the strong internal electric fields which impair carrier recombination and contribute to efficiency droop. This is particularly true for green LEDs where the internal electric fields are stronger and are believed to cause a rapid reduction in efficiency at green wavelengths known as "the green gap". The availability of cubic GaN from a readily commercialisable process on large diameter silicon wafers is as a key enabler for increasing the efficiency of green LEDs and reducing the cost of LED lighting. Read more »
Technologies | LEDs | Material Science | Jan 13, 2016
Uncovering Oxygen’s Role in Enhancing Red Eu-Doped GaN LEDs
Uncovering Oxygen’s Role in Enhancing Red Eu-Doped GaN LEDs Oxygen is indispensable to animal and plant life, but its presence in the wrong places can feed a fire and cause iron to rust. In the fabrication of solid state lighting devices, scientists are learning, oxygen also plays a two-edged role. While oxygen can impede the effectiveness of gallium nitride (GaN), an enabling material for LEDs, small amounts of oxygen in some cases are needed to enhance the devices’ optical properties. GaN doped with europium (Eu), which could provide the red color in LEDs and other displays, is one such case. Read more »
Technologies | Research | Light Generation | Health | Perception | Simulation Tools | Jan 04, 2016
Latest Research Publications in the Journal of Solid State Lighting
Latest Research Publications in the Journal of Solid State Lighting On December 24th and 29th, 2015, three new articles have been published in the SpringerOpen Journal of Solid State Lighting. The three articles are titled "Optical Role of Die Attach Adhesive for White LED Emitters: Light Output Enhancement without Chip-Level Reflectors", "The Importance of Intrinsically Photosensitive Retinal Ganglion Cells and Implications for Lighting Design", and "Towards Perceptual Accuracy in 3D Visualizations of Illuminated Indoor Environments". Read more »
Technologies | Luminaires | Outdoor Applications | Nov 26, 2015
Gunshot Detection for Lighting Fixtures
Gunshot Detection for Lighting Fixtures Cities and their emergency responders will soon have a new way to deploy gunshot detection technology and be able to respond to incidents and react faster to protect their residents. A memorandum of understanding (MOU) between GE Lighting and SST, Inc., developer of the ShotSpotter™ crime detection and location suite, lays ground to embedding sophisticated ShotSpotter technology into GE’s intelligent LED street lights. Read more »
Technologies | Light Conversion | Quantum Dots | Nov 25, 2015
Cadmium-Free Quantum Dot Technology in LED Lighting
Cadmium-Free Quantum Dot Technology in LED Lighting Nanoco and its partner Marl International, a pioneer of the LED lighting industry, demonstrated four product lines based on Nanoco’s CFQD® quantum dot film technology last week at LuxLive. The CFQD® Quantum Dot technology as a revolutionary solution for high-end lighting applications in retail and specialty, architecture, and agriculture, where maintaining true-to-life color representations maximizes user experience and value. Read more »
Technology | Sep 07, 2015
Background Information on the Luxeon C LED Family from Lumileds
Background Information on the Luxeon C LED Family from Lumileds In an exclusive interview, Rahul Bammi, Vice President of Marketing & Product Management at Lumileds, and David Cosenza, Product Manager for the Luxeon Color LED Family, disclosed some background information on why this new product family was designed and why the very specific, new, and unique properties were implemented. Read more »
Technologies | LEDs | Light Conversion | Sep 01, 2015
FAU Researchers Create the World's First White LEDs Based on Fluorescent Proteins
FAU Researchers Create the World's First White LEDs Based on Fluorescent Proteins LEDs are up to 80 percent more energy-efficient than normal light bulbs and last around five times as long as energy-saving light bulbs. As a result they are being used more and more frequently as a source of light. Nevertheless, white LEDs still have room for improvement, as current manufacturing processes are either very expensive or result in the lifetime of the LEDs being reduced. Researchers at FAU have now developed a new, rather unusual manufacturing method: their LEDs are partly made of fluorescent proteins. Read more »
Technology | Aug 21, 2015
Researchers Propose New Technology without Rare Earth Metals for LED Lighting
Researchers Propose New Technology without Rare Earth Metals for LED Lighting At the 250th meeting of the American Chemical Society a novel approach to generate white light without using rare earth metals was presented. The reaserachers claim that this approach will lead to cheaper warm white LEDs than the currently used technologies. A press conference on this topic was held on Wednesday, Aug. 19, at 9 a.m. Eastern time in the Boston Convention & Exhibition Center. Read more »
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