Trends

Trends

Technology | May 04, 2015
Configuration Via the Mains: Simple, Reliable and Professional
Configuration Via the Mains: Simple, Reliable and Professional As the heart of any LED luminaire, the LED driver not only has to meet strict requirements in terms of quality and reliability but also be flexible enough to adapt to different conditions. ready2mains – a new technology from Tridonic – helps enormously. The article explains what is needed and how it works. Read more »
White Paper | Technology | Mar 30, 2015
TRIAC Dimmable, Isolated LED Driver with High Power Factor Needs No Opto-Isolators
TRIAC Dimmable, Isolated LED Driver with High Power Factor Needs No Opto-Isolators As environmental concerns over traditional lighting in-crease and the price of LEDs decreases, high power LEDs are fast becoming a popular lighting solution for offline applications. In order to meet the requirements of offline lighting - such as high power factor, high efficiency, isolation and TRIAC dimmer compatibility - prior LED drivers used many external discrete components, resulting in cumbersome solutions. By Wei Gu Applications Engineering Section Leader at Linear Technology demonstrates how new solutions reduce complexity while improving performance. Read more »
White Paper | Technology | Feb 16, 2015
Osram Improves Efficiency of Blue LED Chips by Reducing Forward Voltage
Osram Improves Efficiency of Blue LED Chips by Reducing Forward Voltage Osram Opto Semiconductors has achieved one of the best values in the world in terms of forward voltage for blue high-current chips. This has led to an increase in efficiency of up to eight percent. Optimized InGaN chips (Indium-Gallium-Nitride) featuring UX:3 chip technology are the basis for blue or white LEDs – and are already used in production. Osram experts also see considerable potential for reducing the value by a further 20 to 30 millivolts (mV) by the summer of 2015 – offering a further boost in efficiency. Read more »
White Paper | Technology | Feb 05, 2015
Universities Develop Novel LEDs by Band-Structure Engineering in van der Waals Heterostructures
Universities Develop Novel LEDs by Band-Structure Engineering in van der Waals Heterostructures Semi-transparent, flexible electronics are no longer just science-fiction thanks to graphene’s unique properties, University of Manchester researchers have found. Published in the scientific journal Nature Materials, University of Manchester and University of Sheffield researchers show that new 2D ‘designer materials’ can be produced to create flexible, see-through and more efficient electronic devices including semi-transparent LEDs. Read more »
White Paper | Technology | Jan 15, 2015
Ending the Invisible Threat - Confronting the LED Flickering Issue
Ending the Invisible Threat - Confronting the LED Flickering Issue One of the topics in 2014 International LIGHTFAIR DOE training was “SSL Flicker Fundamentals and Why We Care“ (Michael Poplawski and Naomi Miller 2014),this reignited the industry’s discussion on light modulation. This topic was already raised by ASSIST earlier, where research on human’s level of tolerance to high-frequency flickers have been done and published in several lighting magazines by Rebekah Mullaney, hoping to encourage LED manufacturers and distributors to put more emphasis on finding a permanent solution that is more suitable for people’s well-being. - Andy Fei and Nina Chen from ALT-LED summarize these flicker research results and explain how to avoid flicker issues. Read more »
White Paper | Technology | Jan 09, 2015
Compute Simulation Sheds Light On Why Blue LEDs Are So Tricky To Make
Compute Simulation Sheds Light On Why Blue LEDs Are So Tricky To Make Researchers in our Department of Chemistry have collaborated with groups at University College London (UCL) and Daresbury to uncover the mystery of why blue light-emitting diodes (LEDs) are so difficult to make, by revealing the complex properties of their main component – gallium nitride – using sophisticated computer simulations. Read more »
White Paper | Technology | Jan 09, 2015
LpS 2014 Scientific Award Winner Article: New Binning Strategy for White LEDs
LpS 2014 Scientific Award Winner Article: New Binning Strategy for White LEDs After having recognized the deficiencies of the ANSI binning strategy, which is based on the visually false magnification of MacAdam’s ellipses, Dr. Peter Bodrogi and Prof. Tran Quoc Khanh from the Technical University Darmstadt propose a new binning strategy based on a so-called semantic interpretation to describe and easily communicate the magnitude of acceptable chromaticity differences. Read more »
Resources | Reports | Market | Technologies | OLEDs | Dec 11, 2014
Research and Markets Announces OLED Lighting Opportunities 2015-2025 Forecast
Research and Markets Announces OLED Lighting Opportunities 2015-2025 Forecast OLED lighting is an emerging solid-state lighting technology. It potentially provides a route into the large and growing global lighting market. The lighting market is however complex as it is a highly fragmented space thanks to the existence of a broad technology mix and a diversity of customer needs. Read more »
White Paper | Technology | Nov 21, 2014
Thermoresponsive PDLC Coating for Smart CCT-Tunable LED Applications
Thermoresponsive PDLC Coating for Smart CCT-Tunable LED Applications When the 2014 Nobel Prize in physics was awarded this October to three Japanese-born scientists for the invention of blue light emitting diodes (LEDs), the prize committee declared LED lamps would light the 21st century. Now researchers from the Netherlands propose a novel way to ensure the lights of the future not only are energy efficient but also emit a cozy warmth. Cornelissen and his colleagues from the Eindhoven University of Technology, Netherlands describe their new LEDs in a paper published in The Optical Society's (OSA) open-access journal Optics Express. Read more »
Technology | Nov 06, 2014
Osram Reports Record Figures for Green InGaN-Based and Conversion LEDs
Osram Reports Record Figures for Green InGaN-Based and Conversion LEDs The “Hi-Q-LED” project funded by Germany’s Federal Ministry of Education and Research (BMBF) has made pioneering advances with green LEDs, greatly diminishing what is known as the “green gap” phenomenon – the significant drop in efficacy in the green spectral range. The result is a green-emitting LED based on indium gallium nitride (InGaN) semiconductors which achieves a record efficacy of 147 lumens per watt (lm/W) at a wavelength of 530 nanometers (nm) and a spectral width of 35 nm. In addition, another green LED developed by combining a blue chip with a phosphor converter has achieved a record-breaking efficacy exceeding 200 lm/W. Read more »
Technology | Oct 07, 2014
And the Nobel Price 2014 Goes To ... The Inventors of the Blue LED
And the Nobel Price 2014 Goes To ... The Inventors of the Blue LED The Royal Swedish Academy of Sciences has decided to award the Nobel Prize in Physics for 2014 to Isamu Akasaki from the Meijo University, Nagoya, Japan and Nagoya University, Japan, to Hiroshi Amano from the Nagoya University, Japan and to Shuji Nakamura from the University of California, Santa Barbara, CA, USA for the invention of efficient blue light-emitting diodes which has enabled bright and energy-saving white light sources. Read more »
Technology | Sep 25, 2014
Nanotechnology May Lead to Better, Cheaper LEDs
Nanotechnology May Lead to Better, Cheaper LEDs Princeton University researchers have developed a new method to increase the brightness, efficiency and clarity of LEDs, which are widely used on smartphones and portable electronics as well as becoming increasingly common in lighting. Using a new nanoscale structure, the researchers, led by electrical engineering professor Stephen Chou, increased the brightness and efficiency of LEDs made of organic materials (flexible carbon-based sheets) by 57 percent. The researchers also report their method should yield similar improvements in LEDs made in inorganic (silicon-based) materials used most commonly today. Read more »
Technology | Sep 18, 2014
LpR 44 Article: Discomfort Glare Perception of Non-Uniform Light Sources in an Office Setting
LpR 44 Article: Discomfort Glare Perception of Non-Uniform Light Sources in an Office Setting LED based luminaires with different luminance patterns and recently with increasingly non-uniform luminance patterns are becoming mainstream. This trend makes discomfort due to glare an important topic. Based on an office setting and the comparison of results from three different regions, L. M. Geerdinck, J. R. Van Gheluwe and M.C.J.M. Vissenberg from Philips Research have reviewed the currently used formulae to predict discomfort glare to ascertain if they are still valid. Read more »
White Paper | Technology | Aug 28, 2014
Osram Opto Demonstrates "3D nano LEDs" for White Light and Sees Series Maturity in Coming Years
Osram Opto Demonstrates "3D nano LEDs" for White Light and Sees Series Maturity in Coming Years By making use of nanotechnology, Osram hopes to produce significantly more LED chips with its existing production plant. Osram researchers have for the first time succeeded in manufacturing a so-called "3D nano LED" for white light. The productivity boost is possible due to the special surface characteristics of the LED chip – in contrast to today's standard models, this is not smooth but consists of many adjacent, microscopically small columns with a three-dimensional structure, thus increasing its light-generating area. The new technology is expected to achieve series maturity in coming years, and Osram would then be one of the first companies to use this technology. Read more »
Technologies | Optics | Material Science | Jul 04, 2014
Novel Nanoparticle Production Method Could Lead to Better LED Lights, Lenses and Solar Cells
Novel Nanoparticle Production Method Could Lead to Better LED Lights, Lenses and Solar Cells Sandia National Laboratories has come up with an inexpensive way to synthesize titanium-dioxide nanoparticles and is seeking partners who can demonstrate the process at industrial scale for everything from solar cells to LEDs. Titanium-dioxide (TiO2) nanoparticles show great promise as fillers to tune the refractive index of anti-reflective coatings on signs and optical encapsulants for LEDs, solar cells and other optical devices. Read more »
Technology | Jul 03, 2014
Significant Technical Progress - BluGlass Demonstrates Best Ever RPCVD (p-GaN) Light Output
Significant Technical Progress - BluGlass Demonstrates Best Ever RPCVD (p-GaN) Light Output Australian Cleantech innovator, BluGlass Limited, has announced today that it has been successful in demonstrating the best ever p-GaN light output using its propriety technology, Remote Plasma Chemical Vapour Deposition (RPCVD) on an MOCVD partial LED structure. This result is greater than a 10 fold improvement in LED efficiency over the first p-GaN demonstration data published by the company in December 2012, when the same measuring methodology is applied. This has been achieved by making significant improvements in addressing the ‘interface challenge’, a key technical hurdle that has been limiting the p-GaN performance demonstration in the past. Read more »
Technologies | Measurement | Jun 18, 2014
How Much Can the Color of Nominal CCT Vary?
How Much Can the Color of Nominal CCT Vary? The threshold at which a color difference becomes perceptible is defined by a MacAdam ellipse. A MacAdam ellipse is drawn over the color space in such a way that the color at its center point deviates by a certain amount from colors at any point along its edge. The scale of a MacAdam ellipse is determined by the standard deviation of color matching (SDCM). A color difference of 1 SDCM “step” is not visible; 2 to 4 steps is barely visible; and 5 or more steps is readily noticeable. Read more »
Technology | Apr 14, 2014
Developing Phosphor-Free White Light from Nanopyramid LEDs
Developing Phosphor-Free White Light from Nanopyramid LEDs Researchers in China have used nitride semiconductor nanopyramid structures to create light-emitting diodes (LEDs) with spectra that are similar to those provided by ‘white light’ LEDs with yellow phosphors [Kui Wu et al, J. Appl. Phys., vol115, p123101, 2014]. The researchers are at the Chinese Academy of Sciences’s institutes of Semiconductors and Mechanics, and Tsinghua University. A similar CAS/Tsinghua team previously reported such devices, using a polystyrene nanosphere mask to make holes for selective-area growth of nanopyramids. Read more »
Technology | Mar 19, 2014
New Technique Makes LEDs Brighter, More Resilient
New Technique Makes LEDs Brighter, More Resilient Researchers from North Carolina State University have developed a new processing technique that makes light emitting diodes (LEDs) brighter and more resilient by coating the semiconductor material gallium nitride (GaN) with a layer of phosphorus-derived acid. Read more »
White Paper | Technology | Mar 14, 2014
Quantum Materials Secures Los Alamos Thick-Shell Quantum Dot Technology to Increase Brightness
Quantum Materials Secures Los Alamos Thick-Shell Quantum Dot Technology to Increase Brightness Quantum Materials Corporation and Los Alamos National Laboratory's today announce Quantum Materials optioning Thick-Shell 'Giant' Quantum Dot patented technology with the potential of 10 to 100-fold improvement in solid-state brightness over conventional nanocrystal quantum dots (QD). High brightness leads to efficient use of materials and increased performance in electronic displays and solid state (LED) lighting. Read more »
Technology | Mar 11, 2014
Two-Dimensional Material Shows Promise for Optoelectronics
Two-Dimensional Material Shows Promise for Optoelectronics A team of MIT researchers has used a novel material that’s just a few atoms thick to create devices that can harness or emit light. This proof-of-concept could lead to ultrathin, lightweight, and flexible photovoltaic cells, light emitting diodes (LEDs), and other optoelectronic devices, they say. Read more »
Technology | Mar 11, 2014
Scientists Build Thinnest-Possible LEDs and Find It To Be Stronger, More Energy Efficient
Scientists Build Thinnest-Possible LEDs and Find It To Be Stronger, More Energy Efficient Most modern electronics, from flat-screen TVs and smartphones to wearable technologies and computer monitors, use tiny light-emitting diodes, or LEDs. These LEDs are based off of semiconductors that emit light with the movement of electrons. As devices get smaller and faster, there is more demand for such semiconductors that are tinier, stronger and more energy efficient. Read more »
Technology | Feb 24, 2014
A Roadmap to Efficient Green-Blue-Ultraviolet LEDs
A Roadmap to Efficient Green-Blue-Ultraviolet LEDs Scientists at the U.S. Naval Research Laboratory (NRL) have suggested a method that could significantly increase the efficiency of green-blue-ultraviolet light-emitting diodes based on GaInN/GaN, AlGaN/GaN, and AlInN/GaN quantum wells. Their approach could enable advances in solid state lighting and the creation of low threshold lasers and high power light emitting diodes (LEDs). Their research is published in the January 25 and November 26, 2013 issues of Applied Physics Letters. Read more »
White Paper | Technology
WHITE PAPER: Intelligent Over Temperature Protection for LED Lighting Applications
WHITE PAPER: Intelligent Over Temperature Protection for LED Lighting Applications LED lighting is becoming increasingly popular. It offers numerous advantages over conventional lighting, but there are still some issues. One is thermal management. Bernd Pflaum and Hakan Yilmazer from Infineon Technologies explain how LED driver ICs with smart over temperature protection help to increase lifetime and optimize system costs of LED lighting systems. Read more »
Technology | Feb 03, 2014
Target Group-Adequate Lighting of Shop and Retail Areas – New Retail Study by Zumtobel
Target Group-Adequate Lighting of Shop and Retail Areas – New Retail Study by Zumtobel n a laboratory study conducted by Zumtobel and Gruppe Nymphenburg it has been possi-ble for the first time to measure people's affective responses to various lighting scenarios in shops on an empirical basis. In the process, the lighting preferences of seven different groups of customers were analysed using a neuropsychological target group model. The findings of this study will help to develop lighting concepts for retail, to present goods per-fectly and to increase the customers' sense of well-being, thus making them stay in the shop longer. Read more »
White Paper | Technology | Jan 24, 2014
Cree Sets New Efficiency Benchmark with First 200 lpw LED Luminaire Prototype
Cree, Inc. raises the performance bar again with the demonstration of the first 200 lumen-per-watt (LPW) LED concept luminaire, which is more than twice the efficiency of the best linear fluorescent luminaires. The latest Department of Energy (DoE) projections* had estimated that this level of luminaire efficiency would not occur until after 2020, but Cree’s latest innovation has made this possible six years sooner than projected. The prototype leverages Cree’s vertical integration with innovations in LED chips, optics, materials technology and novel system design to deliver unprecedented performance. Read more »
page_peel