2015-08-03

Tokyo Institute of Technology Researchers Unravel Ferroelectric Properties in HfO2 Thin Films

Ferroelectric materials have applications in next-generation electronics devices from optoelectronic modulators and random access memory to piezoelectric transducers and tunnel junctions. Now researchers at Tokyo Institute of Technology report insights into the properties of epitaxial hafnium-oxide-based (HfO2-based) thin films, confirming a stable ferroelectric phase up to 450 °C. As they point out, “This temperature is sufficiently high for HfO2-based ferroelectric materials to be used in stable device operation and processing as this temperature is comparable to those of other conventional ferroelectric materials.”
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2015-08-03

Color Consistency─ One of the Challenges for Solid-State Lighting

When discussing the properties of LEDs, the word ‘color’ immediately comes to our minds; and there are so many facets to our perception of color! An important one is color consistency, which is really a blanket qualifier for a variety of phenomena. Today, I will discuss color consistency at the level of the LED component (i.e. the white emitter including an LED die and phosphors). Keep in mind, though, that this is only part of the story, and eventually the system-level behavior is what matters.
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2015-07-22

UCLA Study Finds Multilayer MoS2 as Potential New LED Material

Over the last decade, advances in the technology of light-emitting diodes, or LEDs, have helped to improve the performance of devices ranging from television and computer screens to flashlights. As the uses for LEDs expand, scientists continue to look for ways to increase their efficiency while simplifying how they are manufactured. 
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2015-07-02

New Optic Technology Could Convert Smartphones into Pregnancy Test Kits

Researchers at the Hanover Centre for Optical Technologies (HOT), University of Hanover, Germany, have developed a self-contained fiber optic sensor for smartphones with the potential for use in a wide variety of biomolecular tests, including those for detecting pregnancy or monitoring diabetes. The readings of the sensor can run through an application on a smartphone which provide real-time results. When properly provisioned, the smartphone-user has the ability to monitor multiple types of body fluids, including: blood, urine, saliva, sweat or breath. In case of medical applications, the sensor readings can be combined with the GPS signal of a smartphone and users can then be guided to the next drug store, hospital or the ambulance.
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2015-06-30

White Efficiency in LED Lighting

All of us have, at some point or another, complained about the use of lumens as a metric – for a variety of reasons. First, lumens are not very accurate as a proxy for perceived brightness. Second, there is a temptation to increase lumens by ‘cheating’, for instance on the chromaticity of a lamp – ponder this next time you are subjected to a depressingly greenish fluorescent lamp! Third, the lumen race pushes the industry to compromise on competing aspects, especially color rendition. If two LEDs emit the same number of optical watts, but one generates more long-wavelength photons to properly render deep-red tones, it is by definition penalized in terms of lumens.
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2015-06-30

Quantum Computing At the Speed of Light?

Wired technology is now largely a thing of the past. We now use wireless networks and new for faster computing and communication devices. But where do we go next? Every day we read another article that suggests the future is closer than we think. Whether it’s artificial intelligence, robots in the home, or technology that will make today’s ‘supercomputers’ as outdated as the dinosaur.
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2015-06-29

Danish Researchers: Nanowires Could Become the Future for LEDs

The latest research from the Niels Bohr Institute shows that LEDs made from nanowires will use less energy and provide better light. The researchers studied nanowires using X-ray microscopy and with this method they can pinpoint exactly how the nanowire should be designed to give the best properties. The results are published in the scientific journal, ACS Nano.
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2015-06-24

Money Matters -­‐ Retrofit or Relight

The retrofit and relight business is in full swing today. A variety of new LED replacement luminaires, retrofit/conversion kits and lamps are available from a variety of manufacturers and whether we are talking about a T12 to T8 fluorescent conversion or fluorescent to LED, the economic value proposition and project mechanics are well understood.
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2015-06-18

LED Signage Industry: Adapt or Die

A few years ago it became clear that the LED signage industry needed a change. Fundamental shifts in LED technology, plus continual breakthroughs in software and hardware, and new innovations in competitive digital screen technologies, will force the LED sign manufacturer to adapt or die.
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2015-06-09

Soraa: The Challenge of Flicker in Solid-State Lighting

The last Soraa blog post discussed various consequences of driving LEDs, an inherently DC component, with alternative current. Today,Soraa Chief Scientist Aurelien David takes a closer look at one of the most infamous of these: flicker. Flicker is a hot-button topic these days, and one where LEDs tend to struggle.
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2015-06-08

Japanese Researchers Develop Silicon QD-based White-blue LED

A Si quantum dot (QD)-based hybrid inorganic/organic light-emitting diode (LED) that exhibits white-blue electroluminescence has been fabricated by Professor Ken-ichi SAITOW (Natural Science Center for Basic Research and Development, Hiroshima University), Graduate student Yunzi XIN (Graduate School of Science, Hiroshima University), and their collaborators. A hybrid LED is expected to be a next-generation illumination device for producing flexible lighting and display, and this is achieved for the Si QD-based white-blue LED. For details, refer to "White-blue electroluminescence from a Si quantum dot hybrid light-emitting diode," in Applied Physics Letters; DOI: 10.1063/1.4921415.
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2015-06-08

Dow Corning: Rapid Growth of LED Lighting Driving Adoption of Advanced Silicone Technologies

General lighting applications for LEDs continue to accelerate in China, thanks to improvements in LED power, efficacy and quality, as well as new government mandates that seek to replace conventional incandescent lighting with solid-state sources. According to market analyst TechNavio, China’s LED lighting market will grow at a compound annual growth rate of 26.9% between 2013 and 2018, making the country one of the globe’s largest potential markets for LED lighting. However, as the technology matures, pressure will grow on LED lighting OEMs to offer more differentiated lighting designs within increasingly stringent cost constraints. 
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2015-05-28

GE: Moonlight Isn’t Enough for a Walk by the Sea

As year-round tourist hot-spots, many European seaside towns find that the influx of tourists brings its own unique set of challenges. In order to address safety concerns and minimise the impact on residents, city councils look to make infrastructure investments that improve both the energy efficiency and local ambience of the area.
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2015-05-15

Overview of Global LED Lighting Rebates

With the rapid development of global economy, energy and environment has become one hot topic discussed by us. So far, energy and environment problem has been one of the important factors that retrained economic development. Under such circumstances, many countries have launched key lighting projects and in addition carried out RELEVANT incentives and rebates program. As the 4th generation light source, LED is characterized by energy-efficiency and eco-greenness. LED incentives and rebates programs have risen around the world. Here bellow is the introduction to LED incentives and rebates in some major countries.
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2015-05-11

Data Network Communication at the Speed of Light

In this GE blog entry, Walter Kraus, the chairman of the Li-Fi Consortium, sheds insights on the different Li-Fi technologies available to the market at the moment.
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2015-04-28

LRC Issues New Guide To Selecting LED Troffers

The Lighting Research Center at Rensselaer Polytechnic Institute has released a new guide for contractors and specifiers who are replacing existing fluorescent troffers with new LED troffers or retrofit kits.
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2015-04-21

Soraa: Consumers Confused by Complex LED Metrics

In this blog entry from Soraa, the company addresses some of the challenges the LED industry faces when it comes to applying and explaining the different metrics to LED consumers.
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2015-04-07

Wafer Level Chip Scale LED Package Jumping over Flip Chip CSP LED

No more packaging – Package-less Package. That is the fundamental solution which LED manufacturers are looking for to meet the market demands. Unfortunately, the era of Flip Chip-Chip Scale LED Package (FC CSP LED) is, however, emerging. It will make the time of the wide spread of LED light coming slowly step by step. Any LED manufacturers who aggressively jump over FC CSP LED and current leading-edge packaging technologies would be expected under the paradigm of no more packaging. A little of endeavour has been conducted to fulfil package-less package like Phosphor on Die and Package Free Chip.
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2015-03-30

Important Lessons for Retail Lighting from The Dress that Broke the Internet

In late February, an innocent question raised by Grace Johnston from Scotland as to what color a striped lace dress her mother wore to her wedding on Tumblr went viral on the Internet. Celebrities and public were equally divided as to whether the dress was blue and black or white and gold, and the heated debate went on well into mid-March. Since the incident, there has been many theories ranging from genetics, optical illusion, visual perception, and poor lighting to explain the phenomemnon. LEDinside had an opportunity to speak to Bridgelux experts Maria Topete, and Aaron Merill, Senior Director of Channel Marketing about this rare visual perception phenomenon, and why this is so important for the retail lighting sector.
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2015-03-23

How to Design with GaN Drivers

You may have recently encountered “GaN,” which is replacing silicon (Si) in some key applications for power conversion. In this blog series, “How to design with GaN,” I will take a look at how gallium nitride (GaN) is different from Si and what the key considerations are when creating a power design with GaN.
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2015-03-13

Low Power LED Lighting Trends (V)

This is the fifth and final installment of Fairchild Semiconductor's series on LED lighting trends. In this entry, Fairchild Semiconductor experts will address PAR16,20,30,38 lamps. These lamp types are AC voltage input, power rating between 4W~20W, socket is screw type E26/27 or 2 pin type GU10, as shown in Fig. 1.
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2015-03-13

In-store Lighting, An Underused Resource

Both large department chain stores and smaller outlets usually fail to take advantage of the different options for interior and exterior lighting.
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2015-03-13

LayTec and German University Collaborate on In-situ Photo-Luminescence of Growing III-Nitride LED Structures

In a collaboration between LayTec and Prof. Dirk Rueter´s group at University of Applied Sciences Ruhr West a breakthrough has been achieved regarding the real-time monitoring of InGaN/GaN quantum well emission wavelength during MOCVD growth. It is well known that room temperature wafer based photoluminescence (PL) measurements provide an excellent forecast of the emission wavelength and emission intensity of the later LED devices. Recently, a prototype in-situ PL system worked simulatnneously with a LayTec Pyro 400 in a commercial multi-wafer MOCVD reactor. The related paper [2] was rocketed immediately to the status of  “most downloaded Journal of Crystal Growth articles”  from Science Direct. This  work is supported under grant KF3242801NT3 by BMWi (German Federal Government).
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2015-03-10

Low Power LED Lighting Trends (IV)

In Part III of Fairchild Semiconductors blog series on LED lighting trends we discussed MR11/16 Lamp LED Driver Design Challenges. Now we’ll look at A19, E14/17, E26/27 Bulb Lamp LED Driver Design.
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2015-03-09

Value Adding Lighting for Petrol Stations

Balazs Torok,  Petrol Station Key Account Manager at GE Lighting EMEA, shares some of his insights on how to brighten up petrol stations with proper lighting.
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2015-03-06

Low Power LED Lighting Trends (III)

In Part II of our series on Solutions for Today’s Low Power LED Lighting Trends we listed the many regulatory and industry standards that designers need to account for in order to understand the design constraints of any given project for reducing power losses, power factor correction and low THD in the LED driver. In addition to the regulations and standards discussed, there are a number of other factors that need to be considered that can impact design. These include:
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2015-03-04

Low Power LED Lighting Trends (II)

This is Part II in our five part series that takes a big picture look at today’s low-power LED lighting trends. In Part I we reviewed the worldwide market for LED lighting and predictions for the potential of high-brightness LEDs. In this installment we will look at some of the many driver standards and governmental agency requirements designers need to be aware of.
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2015-03-03

Low Power LED Lighting Trends (I)

This is the first part of Fairchild Semiconductor's five part blog series that will examine LED lighting trends and Fairchild solutions. LED lighting applications fall into three basic input power levels: low-power is less than or up to 20 Watts; mid-power is between 20 Watts and 50 Watts; and high-power is above 50 watts. In the real-world, applications do not always fit nicely in these three buckets, but these power levels align when considering LED driver solutions.
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2015-02-05

The Next Generation of LED Filament Bulbs

Until now, the basic design of an LED lamp has remained fundamentally unchanged. The common formula has been to use a single, high power GaN chip (or a few larger chips), add phosphor (remotely or directly), and drive the chip(s) with as much power as possible to yield the maximum amount of white light. The key to the longevity of the lamps is to effectively dissipate the heat that is generated by the large LED chips. This is why so many LED lamps have large heat sinks added to the base of the lamps.
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2015-02-04

Lumia: Streetlights Replacement Problems and Solutions

  Streetlights are being replaced from conventional technologies and converted into new LED solutions. This is not a new story but we are getting more and more information saying that the change to LED causes problems for people living nearby the newly installed LED streetlights. We at Lumia® would like to explain why this is not a problem for our streetlight solutions and how we are avoiding the issues faced by other streetlight brands.   
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Lumileds, the global leader in light engine technology, today expanded its line of LUXEON C Color LEDs to a total of 12 colors (and 8 whites), making it the industry’s broadest line of color LEDs available. The LUXEON C Color Line is an ... READ MORE

Cree, Inc. expands the award-winning ZR Series LED troffer portfolio with the introduction of the new ZR FD LED Series, a commercial spec-grade troffer that delivers superior energy efficiency of 130 lumens per watt. This performance increase ... READ MORE