Trends

Trends

White Paper | Technology | Mar 06, 2012
At High Environmental Temperatures and at Very Low Power LED's Wall Plug Efficiency Exceeds 100%
At High Environmental Temperatures and at Very Low Power LED's Wall Plug Efficiency Exceeds 100% For the first time, researchers have demonstrated that an LED can emit more optical power than the electrical power it consumes. Although scientifically intriguing, the results won’t immediately result in ultra-efficient commercial LEDs since the demonstration works only for LEDs with very low input power that produce very small amounts of light and emits primarily in the invisible IR range of 2.4 µm. Read more »
Technology | Feb 10, 2012
IM³OLED Project to Develop Multiscale OLED Modeling Tool
IM³OLED Project to Develop Multiscale OLED Modeling Tool The EU-funded IM³OLED (Integrated Multidisciplinary & Multiscale Modeling for Organic Light-Emitting Diodes) project - coordinated by Holst Centre and the Russian National Research Nuclear University MEPhI - has officially been launched. An international collaboration with the Russian Federation, the project aims to develop a software tool for multiscale OLED modeling. Such a tool would help the OLED industry escape today’s “trial-and-error” development and accelerate towards the goal of 150 lumens per Watt devices. Read more »
Technology | Jan 31, 2012
Removing Impurities from QDs Made by Cation-Exchange Techniques May Lead to Affordable QD-Products
Removing Impurities from QDs Made by Cation-Exchange Techniques May Lead to Affordable QD-Products To the lengthy list of serendipitous discoveries – gravity, penicillin, the New World – add this: Scientists with the U.S. Department of Energy (DOE)’s Lawrence Berkeley National Laboratory (Berkeley Lab) have discovered why a promising technique for making quantum dots and nanorods has so far been a disappointment. Better still, they’ve also discovered how to correct the problem. Read more »
White Paper | Technology | Jan 13, 2012
Success in Research: First Gallium-Nitride LED Chips on Silicon in Pilot Stage
Success in Research: First Gallium-Nitride LED Chips on Silicon in Pilot Stage Researchers at Osram Opto Semiconductors have succeeded in manufacturing highperformance prototypes of blue and white LEDs, in which the light-emitting gallium-nitride layers are grown on silicon wafers with a diameter of 150 millimeters. The silicon replaces the sapphire commonly used until now without a loss in quality. Already in the pilot stage, the new LED chips are to be tested under practical conditions, meaning that the first LEDs on silicon from Osram Opto Semiconductors could hit the market in just two years. Read more »
Technology | Dec 23, 2011
New Developed Technique Makes it Easier To Etch Semiconductors - Especially III-V Semiconductors
New Developed Technique Makes it Easier To Etch Semiconductors - Especially III-V Semiconductors Creating semiconductor structures for high-end optoelectronic devices just got easier, thanks to University of Illinois researchers. The team developed a method to chemically etch patterned arrays in the semiconductor gallium arsenide, used in solar cells, lasers, light emitting diodes (LEDs), field effect transistors (FETs), capacitors and sensors. Led by electrical and computer engineering professor Xiuling Li, the researchers describe their technique in the journal Nano Letters. Read more »
White Paper | Technology | Dec 15, 2011
Independent Study Demonstrating that Pink Sapphire Produces Highest Transmission Colorless Epi-Wafers
Independent Study Demonstrating that Pink Sapphire Produces Highest Transmission Colorless Epi-Wafers GT Advanced Technologies Inc. announced the release of a case study that details the findings of a series of blind material studies conducted to evaluate the impact of sapphire color on the LED manufacturing process. The studies demonstrated that all sapphire, regardless of source, exhibits color at the core level, that the pink hue of GT Advanced Sapphire Furnace (ASF™) material is not indicative of impurities, and that pink ASF sapphire does not have an adverse affect on the LED manufacturing process nor does it require extra steps or incremental costs to remove the pink hue. In addition, it was demonstrated that GT ASF pink sapphire material makes the lowest absorption, highest transmission epi-wafers of the samples examined. Read more »
White Paper | Technology | Dec 01, 2011
New LED Driver Design from Power Integrations Maximizes Efficiency of Compact B10, GU10, E17 and A19 Bulbs
New LED Driver Design from Power Integrations Maximizes Efficiency of Compact B10, GU10, E17 and A19 Bulbs Power Integrations, maker of the world's most efficient, longest-lasting off-line LED driver ICs, today published a reference design (DER-297) describing a high-efficiency, ultra-compact driver for a B10-style LED light bulb. Based on Power Integrations' LinkSwitch-PL non-isolated, single-stage LED driver IC, the power supply is specifically tailored for use with high-voltage LEDs such as the recently announced XLamp XM-L and XLamp XT-E ranges from Cree. DER-297 provides the high-voltage output required by the LEDs, optimizing overall system efficiency by reducing power lost due to current flow in the driver inductor and output diode. Read more »
Technology | Nov 30, 2011
The Maastricht University Medical Center+ and Philips Investigated the Effect of Light on the Sleep-Wake Rhythm of Cardiac Patients
The research shows that after seven days in a patient room fitted with HealWell ? a new lighting system developed by Philips which mimics the natural day/night cycle outdoors ? patients sleep on average 8% longer. After one week in a patient room fitted with standard lighting, on the other hand, patients' sleep duration was in fact slightly shorter than on the first night. Read more »
Technology | Nov 10, 2011
Los Alamos Researchers Unravel the Mystery of Quantum Dot Blinking
Los Alamos Researchers Unravel the Mystery of Quantum Dot Blinking Research by Los Alamos scientists published today in the journal Nature documents significant progress in understanding the phenomenon of quantum-dot blinking. Their findings should enhance the ability of biologists to track single particles, enable technologists to create novel light-emitting diodes and single-photon sources, and boost efforts of energy researchers to develop new types of highly efficient solar cells. Read more »
Technology | Nov 04, 2011
EU Project IMOLA Starts R&D on Large-Area, Intelligent OLED Lighting
EU Project IMOLA Starts R&D on Large-Area, Intelligent OLED Lighting Imec and its project partners announce the launch of IMOLA (Intelligent light Management for OLED on foil Applications), a project under the EU’s 7th framework program for ICT (FP7). The project’s goal is to make large-area OLED-based lighting modules with built-in intelligent light management. These systems will be used in future energy-efficient wall, ceiling and car dome lighting, where the light intensity can be adjusted intelligently, e.g. according to the time of the day or weather conditions. Read more »
Technology | Oct 27, 2011
Competing LEDs: High-quality White Light Produced by Four-Color Laser Source
Competing LEDs: High-quality White Light Produced by Four-Color Laser Source The human eye is as comfortable with white light generated by diode lasers as with that produced by increasingly popular light-emitting diodes (LEDs), according to tests conceived at Sandia National Laboratories. Both technologies pass electrical current through material to generate light, but the simpler LED emits lights only through spontaneous emission. Diode lasers bounce light back and forth internally before releasing it. Read more »
Technology | Oct 18, 2011
The True Knowledge About White LEDs and Our Biological Clocks
The True Knowledge About White LEDs and Our Biological Clocks You come into contact every day with light-emitting diodes (LEDs) - they illuminate alarm clocks, new televisions, traffic lights, and smartphone displays. Increasingly, you will see white-light versions of LEDs becoming available for energy-efficient home lighting, car headlights, and streetlamps. But how does that affect our organism? Read more »
Technology | Oct 17, 2011
609 nm Red LED Prototype from OSRAM Opto Semiconductors Achieves Record Efficiency
609 nm Red LED Prototype from OSRAM Opto Semiconductors Achieves Record Efficiency A red high-power LED has set a new efficiency record in an OSRAM Opto Semiconductors R&D lab with an electro-optical efficiency of 61%. The 1 mm2 chip housed on a laboratory package emits at a wavelength of 609 nm (λ-dom) and has achieved a record value of 201 lm/W at an operating current of 40 mA. At a typical operating current of 350 mA its luminous efficacy is still an impressive 168 lm/W, which means that even at this high wattage more than half of the electrical energy is converted into light. Read more »
Technology | Sep 21, 2011
SEMI Announces Formation of India SSL Special Interest Group
Today SEMI India announced the formation of a Special Interest Group on high-brightness light-emitting diodes (HB-LEDs) and solid state lighting (SSL). The new SEMI SSL Special Interest Group in India will focus on materials, equipment and manufacturing issues to further promote the industry— through cost reduction, quality improvement, supply chain development, and industry promotion. The new group comprises both SEMI members and key industry leaders in the HB-LED/SSL market. Read more »
Technology | Aug 24, 2011
R&D of Printoptical Innovator LUXeXceL Made Enormous Progress
R&D of Printoptical Innovator LUXeXceL Made Enormous Progress LUXeXceL's R&D department managed to print concave lenses for light diverging. The research process to control the inward gradient shape of a typical concave lens is finished successfully, resulting that the printing of concave lenses is now in the final development stage and commercially available. Read more »
Technology | Aug 10, 2011
BRIDGELUX Boost Efficiency Record for GaN-on-Silicon Technology LEDs to 160lm/W
BRIDGELUX Boost Efficiency Record for GaN-on-Silicon Technology LEDs to 160lm/W Bridgelux Inc., a leading developer and manufacturer of LED lighting technologies and solutions, has shattered its previous industry record for highest Lumen per Watt values for Gallium Nitride on Silicon (GaN-on-Si). Using its proprietary buffer layer technology, the company has demonstrated growth of crack-free GaN layers on 8-inch silicon wafers, without bowing at room temperature, extending the company’s lead in driving the performance and manufacturability of GaN LEDs on silicon substrate. Read more »
Technology | Aug 02, 2011
Independent Research using Xicato Spot Modules: Link Between Light Quality and the Attraction of Retail Displays
Independent Research using Xicato Spot Modules: Link Between Light Quality and the Attraction of Retail Displays There is a strong link between the quality of accent light sources, in terms of color rendering ability and in particular the rendering of deep reds, and the attention-grabbing potential of retail displays, according to the outcome of an on-site evaluation by end-users and lighting designers conducted by independent researcher, Colette Knight and peer reviewed by University College London. Shoppers and lighting designers took part in the experiment carried out in a House of Fraser store in London. It showed that there was no statistical difference between the appreciation of colors rendered with halogen or Ra 95 (R9 >95) LED sources, whereas the rating was lower for Ra 80 (R9<20) LED sources. This translated directly into the rating of the display itself in terms of its attraction. Read more »
Technology | Aug 02, 2011
Cree Prototype Exceeds DOE’s 21st Century Lamp L Prize Requirements
Cree Prototype Exceeds DOE’s 21st Century Lamp L Prize Requirements Demonstrating the future of lighting, Cree, Inc. today unveiled a concept LED light bulb from its lighting research and development team. Redefining what is possible with high-performance LED lighting, the lamp delivers more than 1,300 lumens at 152 lumens per watt (LPW) using Cree TrueWhite® Technology. Cree’s prototype LED light bulb exceeds the performance goals set by the U.S. Department of Energy (DOE) for the 21st Century Lamp, the third category in its L Prize competition. Read more »
Technology | Jul 26, 2011
New 3-D Photonic Crystal has both Electronic and Optical Properties
New 3-D Photonic Crystal has both Electronic and Optical Properties In an advance that could open new avenues for solar cells, lasers, metamaterials and more, researchers at the University of Illinois have demonstrated the first optoelectronically active 3-D photonic crystal. To test their technique, the group built a 3-D photonic crystal LED the first such working device. Read more »
Technology | Jul 15, 2011
Studies Published on Flicker Perception from SSL Systems - ASSIST to Release Related Recommendation
Studies Published on Flicker Perception from SSL Systems - ASSIST to Release Related Recommendation Flicker and stroboscopic effects have been a concern with solid-state lighting (SSL), and industry and the ENERGY STAR program have debated recently the effects of frequency and other driving modes on the perception and acceptability of flicker. To provide further data and guidance in this area, the Lighting Research Center (LRC) at Rensselaer Polytechnic Institute has conducted human factors studies of flicker that were recently published in the Lighting Research and Technology journal. The studies, funded by the Alliance for Solid-State Illumination Systems and Technologies (ASSIST), will become the basis for future ASSIST recommends guidelines on flicker from SSL systems. Read more »
Technology | Jul 12, 2011
RoseStreet Labs Scientists Demonstrate First Long Wavelength LED Based on InGaN On Silicon Technology
RoseStreet Labs Scientists Demonstrate First Long Wavelength LED Based on InGaN On Silicon Technology RoseStreet Labs, (RSL), announced today the world’s first demonstration of a long wavelength LED device utilizing low cost silicon wafer substrates. Green and longer wavelength LEDs have been sought after by both science and industry for an extensive period of time because they would fill a high-value gap in the rapidly growing global LED market for lighting and illumination where energy efficiency, low cost and miniaturization are critical product characteristics. Read more »
Technology | Jun 22, 2011
Researcher from the University of Miami Helps Create a Smaller, Flexible LED
University of Miami professor at the College of Engineering, Jizhou Song, has helped design an light-emitting diode (LED) light that uses an array of LEDs 100 times smaller than conventional LEDs. The new device has flexibility, maintains lower temperature and has an increased life-span over existing LEDs. The findings are published online by the "Proceedings of the National Academy of Sciences." Read more »
Technology | Jun 16, 2011
OLED: Record-Breaking Efficiency News from Osram - 87lm/W
OLED: Record-Breaking Efficiency News from Osram - 87lm/W Technological breakthrough at OSRAM: researchers and developers have achieved a new efficiency record in the laboratory for OLED. The laboratory sample achieves 87 lm/W, significantly exceeding the current peak value. And the most important thing: the laboratory sample is highly proximate to the product, thus paving the way for highly energy-efficient OLED products with considerably higher brightness. Read more »
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