LEDs | Solar Systems | Technologies | Jun 04, 2019

Organic Solar Cells and Light-emitting Diodes United

Organic Solar Cells and Light-emitting Diodes United In the past 25 years of research on organic semiconductors, it was thought that organic solar cells and organic light-emitting diodes (OLEDs) could not be combined in a single device. A team of physicists headed by Prof. Koen Vandewal from Technische Universität Dresden has now succeeded in manufacturing an organic solar cell that simultaneously functions as an efficient OLED. Their findings were recently published in the internationally renowned journal Nature Materials. Read more »

Technologies | Research | Health | Human Centric Lighting | Full Spectrum LEDs | May 16, 2019

Scientific Study Demonstrates Positive Effects of Daylight LED on Visual Comfort, Melatonin, Mood, Waking Performance, and Sleep

Scientific Study Demonstrates Positive Effects of Daylight LED on Visual Comfort, Melatonin, Mood, Waking Performance, and Sleep There has been an increase in research activity on the relationship between light and human bio-function, including a recent scientific study focusing on the effects of light spectrum on sleep quality, visual comfort, well-being and daytime alertness conducted by Prof. Christian Cajochen and his team at the University of Basel in Switzerland, entitled: "Effect of Daylight LED on Visual Comfort, Melatonin, Mood, Waking Performance, and Sleep." Read more »

Technologies | LEDs | Monolythic RGB LEDs | Color-Tuning | May 02, 2019

Controlling Current, Duty Cycle and Pulses Allows Color Tuning in Monolithic GaN LEDs

Controlling Current, Duty Cycle and Pulses Allows Color Tuning in Monolithic GaN LEDs A new technique - the result of an international collaboration of scientists from Lehigh University, West Chester University, Osaka University and the University of Amsterdam - could pave the way for monolithic integration for simple color tuning of a light bulb, according to Volkmar Dierolf, Distinguished Professor and Chair of Lehigh's Department of Physics who worked on the project. Read more »

Technologies | Thermal Management | Material Science | Polymers | Apr 30, 2019

MIT Researchers Developed New Heat Conducting Polymer Films

MIT Researchers Developed New Heat Conducting Polymer Films Polymers are usually the go-to material for thermal insulation. Think of a silicone oven mitt, or a Styrofoam coffee cup, both manufactured from polymer materials that are excellent at trapping heat. Now MIT engineers have flipped the picture of the standard polymer insulator, by fabricating thin polymer films that conduct heat — an ability normally associated with metals. In experiments, they found the films, which are thinner than plastic wrap, conduct heat better than many metals, including steel and ceramic. Read more »

Technologies | Light Conversion | Phosphors | White LEDs | Apr 24, 2019

Energy-Saving New Red LED Phosphor Developed at University of Innsbruck

Energy-Saving New Red LED Phosphor Developed at University of Innsbruck The human eye is particularly sensitive to green, but less sensitive to blue and red. Chemists led by Hubert Huppertz have now developed a new red phosphor whose light is well perceived by the eye. This increases the light yield of white LEDs by around one sixth, which can significantly improve the energy efficiency of lighting systems. Read more »

Technologies | Research | LEDs | Light Generation | Exciton | Apr 15, 2019

TU Vienna - New Method to Generate Light from Exotic Particle States

TU Vienna  - New Method to Generate Light from Exotic Particle States A new type of light-emitting diode has been developed at TU Wien. Light is produced from the radiative decay of exciton complexes in layers of just a few atoms thickness. Read more »

Resources | LpR Article | Technologies | Driver Modules | NFC | Apr 12, 2019

Standardized Programming of Lighting Components Using NFC Technology

Standardized Programming of Lighting Components Using NFC Technology LpR 70 Article, page 88: NFC programming of LED drivers is rapidly gaining popularity as a fast, feature-rich, flexible and easy method to set the operating characteristics of LED drivers inside luminaires. Arnulf Rupp, Chair of MD-SIG, describes how the MD-SIG specification for NFC programming of lighting components makes it easy for luminaire manufacturers to use NFC programming in a production line where multiple brand drivers are used one after the other. Read more »

Resources | LpR Article | Technologies | Controls | Wireless | Bluetooth | Apr 10, 2019

Bluetooth Mesh Protocol as Applied to Lighting

Bluetooth Mesh Protocol as Applied to Lighting Little more than one year ago, Bluetooth SIG released the Bluetooth Mesh standardization. Meanwhile, it has become widely adopted and is also one of the favorite systems for lighting controls. Russ Sharer, Vice President of Global Marketing and Business Development for Fulham, starts with an explanation of the Bluetooth Mesh protocol as applied to lighting control and defining its key elements. In a second portion of the article, he answers questions that lighting control evaluators could be asking their vendor. Read more »

Technologies | Research | Publications | Health | Human Centric Lighting | Mar 26, 2019

3D Bio-Optical Models Reveals How the Human Body Uses the Entire Solar Spectrum

3D Bio-Optical Models Reveals How the Human Body Uses the Entire Solar Spectrum History teaches that global changes to the public's environment mandate a higher level of scrutiny to ensure that we first do no harm. In "Melatonin and the Optics of the Human Body" published in the journal Melatonin Research, Zimmerman and Reiter combine optical ray tracing from lighting and ESR data from the medical industry to model for the first time the 3D free radical distributions generate by lighting sources in the human body. Read more »

Technologies | Research | LEDs | Nano-Structures | Light Extraction | Feb 21, 2019

An Old Story Re-Edited? - Firefly-Inspired Surfaces Improve LED Efficiency

An Old Story Re-Edited? - Firefly-Inspired Surfaces Improve LED Efficiency A new type of light-emitting diode lightbulb could one day light homes and reduce power bills, according to Penn State researchers who suggest that LEDs made with firefly-mimicking structures could improve efficiency. Read more »

Resources | LpR Article | Technologies | Thermal Management | Feb 18, 2019

Materials, Manufacturing and Technologies for Designing Passive Cooling Devices

Materials, Manufacturing and Technologies for Designing Passive Cooling Devices Until recently, incandescent bulbs and fluorescent lights were the dominant light sources. Today it’s the energy efficient, durable and, in the meantime, cost effective, LED. But to achieve these attributes appropriate cooling is still necessary and due to progress over the last few years the need for active cooling solutions is limited to a few high power applications as long as the material and technology is carefully chosen. John Broadbent, Managing Director at Columbia-Staver Ltd., describes the different technologies and materials and gives practical advice on how to find the right solution for an application. Read more »

Technologies | LpR Article | Smart Lighting + IoT | Resources | Bluetooth | Jan 31, 2019

Qualified Bluetooth Mesh – Making Lighting Controls Future-Proof

Qualified Bluetooth Mesh – Making Lighting Controls Future-Proof LpR 69 Article, page 88: At Lightfair USA, Siegfried Luger met with Patrick Durand, Worldwide Technical Director at Future Lighting Solutions. One of Mr. Durand’s striking statements was: “Basically, what we need is to future-proof lighting control.” This was the first time that this important aspect was so clearly addressed by a representative of the industry. This led us to asking Mr. Durand to provide LED professional with a technical article to clarify the current situation, explain the technical background that led him to making that statement and to give an idea of which requirements a controls solution must fulfill to be truly future-proof. Read more »

Technologies | Research | Solid State Lighting | Light Generation | Perovskite | Jan 25, 2019

The Possible Future of Lighting - Paint-On Semiconductors from Ornate Quantum Physics

The Possible Future of Lighting - Paint-On Semiconductors from Ornate Quantum Physics LED lights and monitors, and quality solar panels were born of a revolution in semiconductors that efficiently convert energy to light or vice versa. Now, next-generation semiconducting materials are on the horizon, and in a new study, researchers have uncovered eccentric physics behind their potential to transform lighting technology and photovoltaics yet again. Read more »

Technologies | Research | LEDs | Light Conversion | IR-LEDs | Quantum Dots | Dec 13, 2018

Colloidal Quantum Dots Make LEDs Shine Bright in the Infrared

Colloidal Quantum Dots Make LEDs Shine Bright in the Infrared ICFO researchers report on the development of a colloidal quantum-dot light emitting diode with unprecedented quantum and power conversion efficiencies in the infrared range. The ideal optoelectronic semiconductor material should be a strong light emitter i.e. should emit light very efficiently upon optical excitation as well as be an efficient charge conductor to allow for electrical injection in devices. These two conditions when met can lead to highly efficient light emitting diodes as well as to solar cells with the possibility to approach the Shockley-Queisser limit. Until now the materials that have come close to meeting these conditions have been based on epitaxially-grown costly III-V semiconductors that cannot be monolithically integrated to CMOS electronics. Read more »

Resources | LpR Article | Research News | CIE | Applications | Dec 12, 2018

How to Use the Technologies for Adaptive Lighting

How to Use the Technologies for Adaptive Lighting The technologies to provide adaptive lighting are already in the marketplace and are accepted by some jurisdictions. Nonetheless, we have an inadequate understanding of how best to use these technologies, meaning that installations might not serve users well, and in the worst case, might lead to harm. Lighting researchers can generate the knowledge needed to support the best application of adaptive lighting technologies. The International Commission on Illumination (CIE) understands the importance and urgency to deal with problems of adaptive, dynamic and intelligent lighting in all application fields. Hence, this topic is a highlight of CIE’s research strategy. Read more »

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Nationstar's UV LED - a Pioneer in the DUV Sterilization Industry

Nationstar's UV LED - a Pioneer in the DUV Sterilization Industry Since 2016, NATIONSTAR has launched near-ultraviolet LED, deep-ultraviolet LED and modules, with wide wavelength range, high reliability and good feedback in the market. At present, we have established partnerships with many well-known manufacturers. Read more »

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Industry Leading LUXEON 5050 LED Gets Performance Boost

Industry Leading LUXEON 5050 LED Gets Performance Boost Streetlights and high-bay fixtures require high flux and efficacy to meet the ever-increasing demands for system efficiency and energy cost reduction for these applications. Today, LUXEON 5050 LEDs received an upgrade in both flux and efficacy. Typical performance is now 675 lm with 172 lm/W in ... Read more »

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Cree® XLamp® XM-L3 LEDs – More Output & Reliability

Cree® XLamp® XM-L3 LEDs – More Output & Reliability The XLamp® XM-L3 LED delivers a massive 55% upgrade in maximum light output over the XM L2 LED, providing a single-die LED point source for precise optical control. The XM-L3 LED shares the same mechanical and optical footprint as the original XM-L® and XM-L2 LEDs, providing a seamless upgrade path ... Read more »