White Paper | Technology | Jul 31, 2013

Rensselaer Researchers Identify Cause of LED “Efficiency Droop”

Voltage at the onset of high injection and voltage at the onset of the efficiency droop (i.e., the peak-efficiency point) as a function of temperature Rensselaer Polytechnic Institute researchers have identified the mechanism behind a plague of LED light bulbs: a flaw called “efficiency droop” that causes LEDs to lose up to 20 percent of their efficiency as they are subjected to greater electrical currents. Efficiency droop, first reported in 1999, has been a key obstacle in the development of LED lighting for situations, like household lighting, that call for economical sources of versatile and bright light. Read more »

Fundings & Projects | White Paper | Jul 18, 2013

Supported Project “cyCESH” for Cost‐Efficient Printed OLEDs

Schematic structure of an OLED (Credits: cynora) On June 1, 2013, BMBF launched the project cyCESH involving cynora GmbH, Novaled AG and the University of Regensburg with the workgroup of Prof. Dr. Hartmut Yersin. The project is set to run for a duration of three years with a total funding of 6.1 million euros. The research of new soluble materials for the inexpensive production of organic light emitting diodes (Organic Light‐Emitting Diodes ‐ OLEDs) and the production of OLED devices with high efficiency are the main focus of the project. Read more »

Fundings & Projects | White Paper | Jun 12, 2013

Laser Processing Enables Selective Layer Modification of Encapsulated OLEDs for Signage Applications

4JET Technologies GmbH introduces a new laser process for customization and optimizing of organic LEDs at LOPE-C 2013. The new technology is a joint development with Novaled AG. Read more »

Fundings & Projects | Jun 11, 2013

Cheaper, 'Greener' Lighting with Inkjet-Printed Hybrid Quantum dot OLEDs

Left: Novel cadmium selenide (CdSe) quantum dots with ligand enhancement chemistry. The vials on the left contain quantum dots; the vial on the right contains solvent without quantum dots Right: Quantum dots with conjugated polymer and ligand enhancement chemistry (Images: Delaina Amos) To make OLEDs more cheaply and easily, researchers from the University of Louisville in Kentucky are developing new materials and production methods using modified quantum dots and inkjet printing. The team will discuss its work developing more commercially feasible QD-OLED devices at the Conference on Lasers and Electro-Optics (CLEO: 2013) June 9-14 in San Jose, Calif. Read more »

Technology | Jun 04, 2013

MIT Demonstrates New Method for Fine-Tuning Emissions from Quantum Dots

This new technique allows to determine if the width of the spectrum in a given batch is caused by different NCs in the batch having slightly different colors, or if each particle's emissions has a wider spectrum (Credits: Image courtesy of Lauren Aleza Kaye) Tiny particles of matter called quantum dots, which emit light with exceptionally pure and bright colors, have found a prominent role as biological markers. In addition, they are realizing their potential in computer and television screens, and have promise in solid-state lighting. New research at MIT could now make these quantum dots even more efficient at delivering precisely tuned colors of light. Read more »

Technology | May 24, 2013

New Family of Tiny Crystals Glow Bright in LED Lights

Oak Ridge National Laboratory scientists are using x-ray diffraction analysis to better understand tiny crystals that could be used in warm-white LED Light-emitting diodes, better known as LEDs, offer substantial energy savings over incandescent and fluorescent lights and are easily produced in single colors such as red or green commonly used in traffic lights or children's toys. Developing an LED that emits a broad spectrum of warm white light on par with sunlight has proven tricky, however. LEDs, which produce light by passing electrons through a semiconductor material, often are coupled with materials called phosphors that glow when excited by radiation from the LED. Minuscule crystals that glow different colors may be the missing ingredient for white LED lighting that illuminates homes and offices as effectively as natural sunlight. Read more »

Technology | May 08, 2013

Strain Engineering Improves Light Output from Green LEDs

Schematic of epitaxial material for conventional and shallow quantum well (SQW) LEDs (Figure 1). Light output power–current–voltage (L–I–V) characteristics of conventional LED and SQW LED (Figure 2). EQE versus current characteristics of conventional LED and SQW LED (Figure 3) The Chinese Academy of Science reports that researchers in China have used strain engineering to improve the light output power of 530nm green light-emitting diodes (LEDs) by 28.9% at 150mA current injection [Hongjian Li et al, Appl. Phys. Express, vol6, p052102, 2013]. The research was carried out by Chinese Academy of Sciences’ Institute of Semiconductors, Beijing, and University of Hong Kong. Read more »

Technology | May 02, 2013

HD Retina, Martini's World Exclusive New LED Light for an Unmatched Color Perception Quality

For the first time, Martini's HD Retina LED technology could demonstrate its outstanding color rendering capabilities at Euroluce 2013 in Milano All truly great inventions, the ones that really have affected the course of history and people’s lives, have changed the context of a world that was not ready to welcome them. Small and large objects have introduced new solutions and unprecedented perspectives that previously only existed in the minds of their creators. They are innovative, surprising, revolutionary products: in a word unexpected. Read more »

Technology | Apr 03, 2013

Cambridge Invests £1 million to Accelerate GaN-on-Silicon LED Research

Gallium Nitride (GaN), grown on a silicon substrate, to manufacture light-emitting diodes. The material is critical to making LED lighting, which researchers and the Government agree could cut UK electricity consumption by 10-15%.  Credit: University of Cambridge Department of Materials Science & Metallurgy Gallium nitride has been described as “the most important semiconductor since silicon” and is used in energy-saving LED lighting. A new £1million growth facility will allow Cambridge researchers to further reduce the cost and improve the efficiency of LEDs, with potentially huge cost-saving implications. Read more »

Technology | Mar 01, 2013

KIT Demonstrates Light from Silicon Nanocrystal LEDs

Liquid-processed SiLEDs: By changing the size of the silicon nanocrystals, color of the light emitted can be varied. (Photo: F. Maier-Flaig, KIT/LTI) ilicon nanocrystals have a size of a few nanometers and possess a high luminous potential. Scientists of KIT and the University of Toronto/Canada have now succeeded in manufacturing silicon-based light-emitting diodes (SiLEDs). They are free of heavy metals and can emit light in various colors. The team of chemists, materials researchers, nanoscientists, and opto-electronic experts presents its development in the “Nano Letters” journal. Read more »

Technology | Feb 27, 2013

Bluglass Produced p-GaN Films that Meet Industry Benchmark for the First Time

Comparison of MOCVD and Bluglass' low temperature RPCVD process for p-GaN growth Australian clean technology innovator, BluGlass Limited (ASX: BLG) announced today that it has succeeded in producing p-type gallium nitride (GaN) films with industry equivalent electrical properties using its breakthrough low temperature Remote Plasma Chemical Vapour Deposition (RPCVD) technology when grown on top of MOCVD GaN templates. Read more »

Fundings & Projects | Feb 19, 2013

Organic Electronics - How To Make Contact Between Carbon Compounds and Metals

Upon contact between the oxygen atoms protruding from the backbone and the metal, the molecules' internal structure changed in such a way that they lost their semiconducting properties and instead adopted the metallic properties of the surface. (Visualisation: Georg Heimel /HU Berlin) Organic electronics has already hit the market in smartphone displays and holds great promise for future applications like flexible electroluminescent foils (a potential replacement for conventional light bulbs) or solar cells that convert sunlight to electricity. A reoccurring problem in this technology is to establish good electrical contact between the active organic layer and metal electrodes. Organic molecules are frequently used also for this purpose. Until now, however, it was practically impossible to accurately predict which molecules performed well on the job. They basically had to be identified by trial-and-error. Now, an international team of scientists around Dr. Georg Heimel and Prof. Norbert Koch from the HZB and the Humboldt University Berlin has unraveled the mystery of what these molecules have in common. Their discovery enables more focused improvements to contact layers between metal electrodes and active materials in organic electronic devices. Read more »

White Paper | Technology | Feb 14, 2013

Cree Sets New R&D Performance Record with 276 Lumen-Per-Watt Power LED

Cree, Inc. delivers another industry first with a barrier-breaking 276 lumen-per-watt white R&D power LED. This significant milestone exceeds Cree’s previous R&D industry record of 254 lumens per watt and demonstrates Cree’s continued commitment to innovate and accelerate the adoption of LED lighting. Read more »

Technology | Feb 11, 2013

New Atomic Layer Deposition Process for Nitride LED Reflector Structures

Schematic diagram of LED with backside reflector composed of TiO2/Al2O3 DBR and Al mirror grown on backside of PSS. Insets: SEM images of fabricated DBR and PSS (Figure 1). LOP of fabricated LEDs versus injection current(a). Inset: electroluminescence spectra. Photographs of LEDs (b and c) with and without backside reflector in operating state, respectively (Figure 2) Although some groups have developed DBRs for increasing output power of LEDs before, this approach is claimed as the first proposal and demonstration of DBRs grown using ALD rather than electron-beam (EB) evaporation. The advantages of ALD over EB evaporation include better thickness uniformity over large-diameter substrates and thickness control at the atomic level. Read more »

Fundings & Projects | Jan 31, 2013

Public Funded OLED Project So-Light Successfully Concluded

HELLA car rear-light based on 16 red OLEDs Eleven leading German OLED companies and research institutions announced the successful completion of the OLED (Organic Light Emitting Diode) related project; So-Light. This € 14.7 m project was supported by the German Ministry of Education and Research (BMBF) over a three and a half year period and addressed the complete value chain, from primary OLED materials through to OLED-lighting applications. Several of the promising innovations created within the project will now be brought to market by the participants of the So-Light project. Read more »

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Simultaneous Measurement of Several Wavelength Ranges

Simultaneous Measurement of Several Wavelength Ranges Instrument Systems offers smart high-end solutions for complex spectral measurements that are to be made simultaneously over an extremely broad wavelength range, or over several samples. A group of spectroradiometers of the CAS series can be controlled in parallel by a trigger box. Read more »

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Multisystem - Same Core, Multiple Shapes and Functionalities for Track Lighting

Multisystem - Same Core, Multiple Shapes and Functionalities for Track Lighting A.A.G. Stucchi low voltage system for track lighting is developed to satisfy all technical and design needs. The all system is based on a “smart core” that provides easy and magnetic installation of the lighting fixtures, and integrated databus for light control, thus being technically at the ... Read more »

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Eyelove Healthy Lighting LED - New Updates

Eyelove Healthy Lighting LED - New Updates Last October, NATIONSTAR launched Eyelove brand of healthy lighting LED, which attracted wide attention from customers at home and abroad, and was favored by the market and recognized by the industry for its excellent performance. It has won many honors such as "the first batch of healthy lighting ... Read more »

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American Bright Optoelectronics Expands Its Family of IR Products to Cover Security, Remote Control, Appliance and Night Vision Applications

American Bright Optoelectronics Expands Its Family of IR Products to Cover Security, Remote Control, Appliance and Night Vision Applications American Bright has introduced the most complete family of discrete infrared (IR) products in the industry, expanding its 20-year global leadership in the remote control and sensing markets. Product selection includes through-hole, surface mount (SMT) and PLCC variants of the industries’ most ... Read more »

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Red XLamp LEDs Delivers Best-in-Class Horticulture Efficiency

Red XLamp LEDs Delivers Best-in-Class Horticulture Efficiency  Cree, Inc. announces the next-generation XLamp® XP-E2 Photo Red (660 nm) and Far Red (730 nm) LEDs, delivering breakthrough performance for horticulture applications. The new Red XP-E2 LEDs provide a drop-in upgrade for the previous generation that outperforms competing LEDs by up to 68 percent. ... Read more »

EDITORIAL

Well-Being, Light and Exhibition Lighting

Well-Being, Light and Exhibition Lighting Commentary from LpR 71: Well-being is the state of feeling healthy and happy, a good or satisfactory condition of existence, including the emotional and psychological sphere. In 1810, Goethe published a theory based on a human-based approach, combining visual appearance with harmony, culture, ... Read more »

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High Conductive Foils Enabling Large Area Lighting

High Conductive Foils Enabling Large Area Lighting Fraunhofer Institute for Organic Electronics, Electron Beam and Plasma Technology FEP as one of the leading partners for research and development for surface technologies and organic electronics and Sefar AG, a leading manufacturer of precision fabrics from monofilaments, developed a roll-to-roll ... Read more »

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