Trends

Technology | Jan 26, 2011

Voiding Defects: New Technique Makes LED Lighting More Efficient

The new technique reduces the number of defects in those films by two to three orders of magnitude -- increasing the output of light by a factor of two for a given amount of power. (Image courtesy of Lukasz Tylec) Light-emitting diodes (LEDs) are an increasingly popular technology for use in energy-efficient lighting. Researchers from North Carolina State University have now developed a new technique that reduces defects in the gallium nitride (GaN) films used to create LEDs, making them more efficient. Read more »

Technology | Jan 18, 2011

Intematix Introduces ChromaLit™ Remote Phosphor Lighting Systems

The main components of a ChromaLit™ system ChromaLit™ leverages a phosphor composite precisely layered onto a substrate, separated from the blue LED energy source. The independent phosphor emits light when excited by blue light. Because the phosphor has been separated from the energy source and can now be made in any shape and any color, unidirectional light, hot spots, inconsistency and design limitations are no longer SSL challenges. Read more »

Technology | Jan 14, 2011

Epistar Improves Efficacy of Warm-white Light to 170 lm/W with Advanced High-voltage LED Technologies

Epistar reaches warm-white light with efficacy of 170 lm/W and CRI of 88 applying several new technologies Epistar R & D Center have successfully developed several technologies including the new transparent substrate transfer process, the fine structure for increasing photon extraction efficiency and the improvement on the current spreading uniformity. Based on these technologies, the red LED chip with efficacy of 174 lm/W at Wd of 610 nm is realized. Read more »

Technology | Jan 01, 2011

LED – Cooling and Thermal Management

Figure 4 - Often as an application specific heatsink, it is best to use an adapted standard heatsink. As we all know, the life span of an LED depends on the semi-conductor material used as well as the current/heat relationship. The light output of the LED becomes weaker and weaker and once it reaches 50% of its initial value, the life expectancy of the LED has, by definition, been reached. A life span of a few hundred and up to 100,000 hours is possible, but only when avoiding high temperatures which drastically reduce the length of the LED’s life. Read more »

Technology | Dec 22, 2010

Quantum Dots Are Not Dots

Quantum dots are solid-state ”artificial atoms” that are made up of thousands of atoms (yellow spheres) embedded in a semiconductor (blue spheres). Despite this complexity, the photon emission properties of quantum dots were hitherto believed to be like traditional atoms, where a point-emitter description is sufficient. Due to their mesoscopic dimensions, however, the point-emitter description is revealed to break down by comparing photon emission from quantum dots with opposite orientations relative to a metallic mirror. Researchers from the Quantum Photonics Group at DTU Fotonik in collaboration with the Niels Bohr Institute, University of Copenhagen surprise the scientific world with the discovery that light emission from solid-state photon emitters, the so-called quantum dots, is fundamentally different than hitherto believed. The new insight may find important applications as a way to improve efficiency of quantum information devices. Their findings are published on December 19th 2010 in the prestigious journal Nature Physics. Read more »

Technology | Dec 15, 2010

Power Integrations Introduces Reference Design for 5 W LED Lamps with PFC and Flicker-Free TRIAC Dimming

Power Integrations' reference design and schematics for the A19 bulbs using the LNK457DG driver IC. Power Integrations, the leader in high-voltage integrated circuits for energy-efficient solid-state lighting, today announced a new reference design (RDK-251) for a 5-watt offline LED driver that includes flicker-free TRIAC dimming and single-stage power factor correction (PFC). The reference design is based on Power Integrations' LNK457DG, a member of the innovative LinkSwitch-PL family of LED driver ICs optimized for compact, non-isolated installations. Read more »

Technology

LED Source Modeling Method Evaluations

Dear Sir, We have LED lights with UL, CE and RoHs on spot lamp, light bulb, down light and high bay light. JIESEN LED LIGHTING [...] Read more »

Technology

LED – Cooling and Thermal Management

Dear Sir,   We have LED lights with UL, CE and RoHs on spot lamp, light bulb, down light and high bay light.   JIESEN [...] Read more »

Technology

Microstructured Optics for LED Applications

  Dear Sir,   We have LED lights with UL, CE and RoHs on spot lamp, light bulb, down light and high bay light.   [...] Read more »

Technology

Philips Demonstrates World’s First Mains-Powered White-Light OLED Module

Dear Sir,   We have LED lights with UL, CE and RoHs on spot lamp, light bulb, down light and high bay light.   JIESEN [...] Read more »

Technology

GE Scientists Employ Jet Engine Cooling Technology in Prototype LED Bulb

Dear Sir,   We have LED lights with UL, CE and RoHs on spot lamp, light bulb, down light and high bay light.   JIESEN [...] Read more »

Technology | Nov 22, 2010

MIT Study: Significant Energy Savings through User-Controlled Efficient Lighting Systems

Visiting student Nan Zhao works in the test setup at the Media Lab under four LED fixtures controlled by the prototype adaptive system (left). The currently used device that incorporates sensors and controls is not much bigger than a credit card (right). Photo courtesy of Matt Aldrich These days, in newer buildings it’s often hard even to find a plain old-fashioned light switch. Often, the only controls are automatic motion-detector switches that turn off lights when people have left a room — or when they sit too still — or else daunting control panels with arrays of sliders and buttons. But some researchers at the MIT Media Lab are aiming to put the controls back in people’s hands, in a way that provides sophisticated and continuous control and could slash lighting bills by more than half. Read more »

Technology

World Record White OLED Performance Exceeds 100 lm/W

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Technology

World Record White OLED Performance Exceeds 100 lm/W

we have receive your email form led avd, what is it?<a href= http://www.sinepo.com >LED light</a> Read more »

Technology | Nov 15, 2010

NeoPac Unveiled 8 inches Wafer Level PackagingTechnology for LEDs Illumination

NeoPac 8 inches silicon-based wafer level package (WLP) for LEDs delivers 500,000 maintained lumens on a single 8 inches silicon wafer. NeoPac Opto, Inc. a Taiwan based technology-driven LEDs lighting company recently announced its newly developed technology on 8 inches silicon-based wafer level package (WLP) for LEDs illumination, which is derived from its patented NeoPac Universal Platform (NUP) and LEDs Standard Light Sources. Read more »

Technology | Oct 22, 2010

GE Scientists Employ Jet Engine Cooling Technology in Prototype LED Bulb

GE's 1,500-lumen PAR 38 LED bulb. A 1,500-lumen prototype produces as much light as a 100-watt halogen bulb, using 1/3 the energy. GE’s patented “dual cool jets” technology solves thermal challenges, enables lamp design that is half the size and weight of a 600-lumen LED downlight available today. Read more »

Technology | Oct 15, 2010

Epistar Red-Orange LED Chips Set Efficacy Record in the Lab

New generation of Aquarius-series chips have higher efficacy and lower forward voltage as compared to previously announced AX14. Epistar announces today the successful development of a new generation of Aquarius-series AlGaInP LEDs emitting at an efficacy 26 percent higher than the previously announced Mar. 15, 2010 record. Read more »

Technology | Oct 05, 2010

Using Nanostructures to Improve LED Light Emission

Figure 1. Scanning-electronic-microscope image of self-organized silica nanospheres. The diameter is 100nm. Mag: Magnification. Application of nanosphere lithography to create uniform surface roughness on an optical device sample promotes light extraction and collection efficiency. In recent years, nanopattern definition has become a subject of extensive exploration owing to its ability to improve device performance in electronics and optoelectronics. The literature proposes a variety of techniques, including electron-beam lithography, which gives uniform nanopatterns but is expensive, and self-assembled metal nanomasks, which scatter nonuniformly on the sample. As an alternative, we have developed a technology called nanosphere lithography that creates nanopatterns by spin-coating a monolayer of nanospheres on top of the device surface. We have used the technology to fabricate nanopatterns on gallium nitride (GaN)-based LEDs to improve light extraction and collection efficiency. Read more »

Technology | Sep 08, 2010

Philips Demonstrates World’s First Mains-Powered White-Light OLED Module

Philips demonstrates world’s first 230V AC-powered white-light OLED module Scientists from Philips Research have developed the first-ever organic light emitting diode (OLED) module that can be powered directly from a mains electricity supply. The prototype opens the door to OLED systems that can be directly plugged into standard power outlets without the need for bulky power management circuitry. This will reduce the bill of materials and simplify luminaire design for future OLED-based systems aimed at mass-market general illumination applications. Read more »

Technology

Electrical Considerations of LED Bulbs

The full article can be downloaded with an annual subscription to the digital version of LED professional Review (LpR). Details see http://www.led-professional.com/subscribe Read more »

Technology

LED Failure Modes and Methods for Analysis

The full article can be downloaded with an annual subscription to the digital version of LED professional Review (LpR). Details see http://www.led-professional.com/subscribe Read more »

Technology

Microstructured Optics for LED Applications

The full article can be downloaded with an annual subscription to the digital version of LED professional Review (LpR). Details see http://www.led-professional.com/subscribe Read more »

Technology

High Quality GaN Substrates for Modern LED Technology

The full article can be downloaded with an annual subscription to the digital version of LED professional Review (LpR). Details see http://www.led-professional.com/subscribe Read more »

Technology

LED – Cooling and Thermal Management

The full article can be downloaded with an annual subscription to the digital version of LED professional Review (LpR). Details see http://www.led-professional.com/subscribe Read more »

Technology

The Future of OLED Lighting

The full article can be downloaded with an annual subscription to the digital version of LED professional Review (LpR). Details see http://www.led-professional.com/subscribe Read more »

Technology

LED Source Modeling Method Evaluations

The full article can be downloaded with an annual subscription to the digital version of LED professional Review (LpR). Details see http://www.led-professional.com/subscribe Read more »

Technology

Thermally Activated Degradation of Phosphor-Converted White LEDs

The full article can be downloaded with an annual subscription to the digital version of LED professional Review (LpR). Details see http://www.led-professional.com/subscribe Read more »

Technology | Aug 01, 2010

LED Failure Modes and Methods for Analysis

Figure 2: Reflected light (left) and transmitted light (right) microscopy of a typical surface corrosion. LED’s open the way to new applications and markets in various different fields with a broad spectrum of requirements. Beneath other beneficial characteristics, in general, LED’s provide a high reliability, and a lifetime of more than 50;000 hours can be reached. Poor workmanship in manufacturing and unfavorable operational conditions may reduce the reliability significantly. To avoid failures or to achieve fast resolutions of existing problems a good knowledge of the failure mechanisms and suitable analytical methods is required. Objective of this article is to provide an overview of state of the art techniques in LED-Failure analysis. Read more »

Technology | Jul 21, 2010

The Future of OLED Lighting

Figure 2 - Visionox prototype desk lamps. Organic light-emitting diodes (OLEDs) are currently a hot topic in the lighting industry. With major companies such as Osram, Philips, and General Electric displaying prototype products and announcing commercial availability of OLED panels for prototype lighting applications, it is difficult to ignore the industry buzz: “OLEDs are the future of lighting!” Read more »

Technology | Jul 21, 2010

Prototype of a Red Golden Dragon Plus LED Sets New Record

osram_golden_dragon_plus_red_sm-jpg Developers at OSRAM Opto Semiconductors have succeeded in increasing the efficiency of red thin-film LEDs by 30% – a new record. The latest generation of thin-film chips benefit from an optimized chip platform which has potential for further improvements. This boost in efficiency is opening up new LED applications in general illumination, in projection and in the industrial sector. Read more »

FEATURED

Emergency Lighting Just Got Smarter

Emergency Lighting Just Got Smarter NEW NOW: OSRAM’s standalone solution for emergency lighting testing, reporting and maintenance. Meet the QBM DALI EL-T CONV, a converter transforming existing DALI emergency luminaires into wireless ones, all controlled by the same lighting system. Its benefits? Allowing you to design all the ... Read more »

FEATURED

Continuous versus Discrete Calibration Sources: Consideration for Use

Continuous versus Discrete Calibration Sources: Consideration for Use Rapid advancements in the field of solid-state lighting have presented opportunities for the use of LED-based systems for calibrations typically performed with lamp-based sources. Their highly efficient and long-lived performance, rapid power up, and compact size have made LED-based sources an ... Read more »

FEATURED

LUXTECH Offers First Compelling Flex Modules Designed to Replace Traditional Rigid Modules: LUXroll (UL Listed)

LUXTECH Offers First Compelling Flex Modules Designed to Replace Traditional Rigid Modules:  LUXroll (UL Listed) The Indirect Costs of Using Rigid Boards Make Switching to Flexible LED Modules a Compelling Choice. Read more »

EDITORIAL

New LUXEON Rubix Cyan LED Enables 96-98 CRI Across CCT Range in Color Driven Solutions for Entertainment, Stage, and Studio

New LUXEON Rubix Cyan LED Enables 96-98 CRI Across CCT Range in Color Driven Solutions for Entertainment, Stage, and Studio Lumileds added cyan, its eighth color, to the LUXEON Rubix high-power LED family enabling multi-color driven systems to produce very high CRI white light that is so important in entertainment lighting. Adding the cyan LED fills a significant wavelength gap between blue and green in a system and ... Read more »

EDITORIAL

New date: Light + Building Autumn Edition 2022

New date: Light + Building Autumn Edition 2022 Frankfurt am Main, January 10, 2022. As the pandemic situation continues to develop very dynamically, Messe Frankfurt is postponing the world's leading trade fair for light and building technology to autumn 2022. Last December, intensive discussions with customers and cooperation partners had ... Read more »

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