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 »

White Paper | Technology | Jan 30, 2013

Tamura and Koha Demonstrate White LED Using Gallium Oxide at Lighting Japan 2013

Gallium oxide based white LEDs that use 0.3 x 0.3mm (left) and 2 x 2mm (right) blue LED chips, respectively Tamura Corp and Koha Co Ltd developed a white LED using gallium oxide (β-type Ga2O3) and exhibited it at Lighting Japan 2013, a trade show of lighting devices, which took place from Jan 16 to 18, 2013, in Tokyo. Read more »

White Paper | Technology | Jan 30, 2013

New Options for Transparent Contact Electrodes

Microstructures of alternative TCE materials: e, Scanning electron microscopy image of a Cu grid with a line width of 200 nm (ref. 41). f, Scanning electron microscopy image of an Ag nanowire network (mass density 93 mg m−2)77. g, Transmission electron microscopy cross-sections of graphene layer stacks (bilayer, triple and multiple layers). h, Optical microscope picture of CVD-grown graphene, transferred to a 300-nm-thick SiO2 layer85. Note the graphene grain sizes of around 10 μm and the ripples (inset) in the graphene layers Found in flat screens, solar modules, or in new organic light-emitting diode (LED) displays, transparent electrodes have become ubiquitous. Typically, they consist of metal oxides like In2O3, SnO2, ZnO and TiO2 . Read more »

Technology | Jan 29, 2013

University Claims Development of Revolutionary New Zirconium-Doped Hafnium Oxide based Low-Cost LED

Low-magnification (left) and high-magnification (right) photos of light emission from the new zirconium-doped hafnium oxide based LED Professor Yue Kuo of the Artie McFerrin Department of Chemical Engineering at Texas A&M University has fabricated a new type of LED, capable of producing a wide spectrum light while operating for long periods of time at atmospheric conditions. This device is based on a new concept of light emission from an ultra-thin amorphous dielectric layer. Read more »

White Paper | Technology | Jan 09, 2013

Scientists Mimic Fireflies to Make Brighter LEDs

The misfit scales (bottom right) found on the lantern of the Photuris firefly (top right) are the inspiration for a GaN LED, coated with a "factory-roof" pattern (left) that increased light extraction by more than 50 percent The nighttime twinkling of fireflies has inspired scientists to modify a light-emitting diode (LED) so it is more than one and a half times as efficient as the original. Researchers from Belgium, France, and Canada studied the internal structure of firefly lanterns, the organs on the bioluminescent insects’ abdomens that flash to attract mates. The scientists identified an unexpected pattern of jagged scales that enhanced the lanterns’ glow, and applied that knowledge to LED design to create an LED overlayer that mimicked the natural structure. The overlayer, which increased LED light extraction by up to 55 percent, could be easily tailored to existing diode designs to help humans light up the night while using less energy. The work is published in a pair of papers today in the Optical Society’s (OSA) open-access journal Optics Express. Read more »

Technology | Dec 07, 2012

Copper, Gold and Tin for Efficient LED Chips

Post processing of LED wafers with a special galvanizing processes to deposit copper or compounds such as copper-tin or gold-tin allows the smallest housing while increasing the possible current flow (© Fraunhofer IMS ) With gold, copper or tin and special galvanizing processes, scientists are improving the function of semi-conductors and making the manufacture of microelectronic systems a child‘s play. Especially the LED industry could profit from this. Read more »

White Paper | Technology | Nov 26, 2012

BluGlass Demonstrates Low Temperature Grown n-GaN Films that Meet Industry Benchmarks

Australian clean technology innovator, BluGlass Limited announced today that it is now producing n-type gallium nitride (GaN) films with demonstrated industry equivalent performance properties using its breakthrough low temperature Remote Plasma Chemical Vapour Deposition (RPCVD) technology when grown on top of MOCVD GaN templates. Read more »

Technology | Nov 06, 2012

Development of Gallium Nitride Wafers Nearly Doubling Green LED Luminous Efficiency

Until today, the green spectrum is the weak point of LEDs. Efficiency is far lower for the huge spectral range from about 500 to 570nm than it is for the other colors. NGK's approach promises nearly twice the efficiency than ever before The GaN wafers developed by NGK feature low defect density across the entire 2-inch diameter of the wafer surface and have a colorless transparency. NGK achieved this through proprietary improvements to liquid phase epitaxial technology for single crystal growth. Read more »

Products, Materials + Tools | Oct 05, 2012

Key Milestone Reached in OLED Development: cynora Presents New Flexible Prototype

A thin film replaces rigid glass to produce a flexible OLED (left). Flexible OLEDs pave the way for intelligent packaging in the future (right). cynora today unveiled a new flexible OLED prototype, demonstrating yet again the huge potential of OLED technology. One key aspect that sets organic light-emitting diodes (OLEDs) apart from conventional LEDs, is that they are two-dimensional light sources. Additionally, they are extremely thin. This property makes them ideally suited for lighting systems and flat screen displays. So far, however, OLEDs have only been used in rigid form in these application areas. Read more »

Technology | Sep 13, 2012

NTNU Researchers Commercialize Semiconductors Grown on Graphene

Solar cells and light emitting diodes are expected to be first in line for future applications of the CrayoNano technology NTNU researchers have patented and are commercializing GaAs nanowires grown on graphene, a hybrid material with competitive properties. Semiconductors grown on graphene are expected to become the basis for new types of device systems, and could fundamentally change the semiconductor industry. The technology underpinning their approach has recently been described in a publication in the American research journal Nano Letters. Read more »

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NICHIA LED Technology Presented at LICHTWOCHE München

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