LEDs & OLEDs

White Paper | Technology | Mar 06, 2012
At High Environmental Temperatures and at Very Low Power LED's Wall Plug Efficiency Exceeds 100%
At High Environmental Temperatures and at Very Low Power LED's Wall Plug Efficiency Exceeds 100% For the first time, researchers have demonstrated that an LED can emit more optical power than the electrical power it consumes. Although scientifically intriguing, the results won’t immediately result in ultra-efficient commercial LEDs since the demonstration works only for LEDs with very low input power that produce very small amounts of light and emits primarily in the invisible IR range of 2.4 µm. Read more »
White Paper | Technology | Mar 07, 2012
Flexible Organic LED (OLED) Lighting Reaches High Energy Efficiency
Flexible Organic LED (OLED) Lighting Reaches High Energy Efficiency Chemical group Solvay and Holst Centre have demonstrated high efficiency flexible Organic Light Emitting Diodes (OLED) lighting tiles with a surface area of 69cm². These large-area demonstrators contain several layers deposited by solution processing at Holst Centre and additional layers applied by conventional vacuum deposition at Solvay. Read more »
News-Spot | Technology | Apr 25, 2012
Philips Develops Technology to Reduce Dependence on Rare Earths for LEDs
Philips Develops Technology to Reduce Dependence on Rare Earths for LEDs Rare earths are one of the basic elements of modern electronics. They are indispensable for producing LEDs. Since there is a growing demand and restricted quotas, the urgently needed decline of LED prices could be slowed down. Hence Philips has kicked off working on a technology that will significantly reduce its dependence on rare earth minerals for its LED lighting products. Read more »
Technology | May 02, 2012
Low Efficiency Droop LED - Overcoming the Mysterious Phenomenon Could Lead to Affordable LED Lighting
Low Efficiency Droop LED - Overcoming the Mysterious Phenomenon Could Lead to Affordable LED Lighting Like a coffee enthusiast who struggles to get a buzz from that third cup of morning joe, light-emitting diodes (LEDs) seem to reach a point where more electricity no longer imparts the same kick and productivity levels-off. Now a team of researchers from California and Japan has devised a new design for green and blue LEDs that avoids much of this vexing efficiency droop. The findings will be presented at the Conference on Lasers and Electro-Optics (CLEO: 2012), taking place May 6-11 in San Jose, Calif. Read more »
Technology | May 03, 2012
Strategy Analytics Study Predicts that LED Manufacturers are Considering Gallium Nitride on Silicon
As the LED market faces the challenges of softening demand, reduced government subsidies and rapidly declining pricing, manufacturers must investigate new techniques to improve cost structure. Most of the LEDs currently produced use a Gallium Nitride (GaN)-on-sapphire manufacturing process. The Strategy Analytics GaAs and Compound Semiconductor Technologies Service (GaAs) viewpoint, “Compound Semiconductor Industry Review February 2012: Optoelectronics, Materials and Equipment,” provides details of two companies that have purchased equipment from Veeco Instruments to develop less costly GaN-on-silicon fabrication processes, SemiLEDS and Epistar. The report also captures announcements for companies such as Soitec, AIXTRON, AXT, Hitachi Cable, JDSU, Sharp, Furukawa, Finisar, Oclaro, Emcore, GigOptix, IQE and Avago Technologies. Read more »
Technology | May 08, 2012
GT Advanced Technologies Releases Findings of Latest Case Study on Impact of Sapphire Material on HB LED Manufacturing
GT Advanced Technologies Releases Findings of Latest Case Study on Impact of Sapphire Material on HB LED Manufacturing GT Advanced Technologies will host a LED manufacturing symposium in Shanghai, China, May 9-10, 2012. The event will bring together a wide range of manufacturers from the LED value chain throughout Asia, from sapphire crystal growers to epi-wafer and LED device producers, to discuss the metrics that matter most in producing high yielding and high quality LEDs. Particular focus will be on the role that high quality sapphire material plays in driving downstream yield improvements and costs reductions. Presenters include representatives from Philips Lumileds, Arima Optoelectronics, Yole Developpement, KLA Tencor, Meyer Berger and GT. Read more »
Technology | May 09, 2012
NGK Developed GaN Wafer for Ultra High Brightness LEDs
NGK Developed GaN Wafer for Ultra High Brightness LEDs NGK Insulators has announced it has developed gallium nitride (GaN) wafers that double luminous efficiency of a LED light source compared to conventional materials. Created with original liquid phase epitaxial growth technology, NGK's GaN wafer has low defect density and colorless transparency over the whole wafer surface. Read more »
Technology | May 11, 2012
Bridgelux and Toshiba Achieve World Class Performance for 8″ GaN-On-Silicon LEDs
Bridgelux and Toshiba Achieve World Class Performance for 8″ GaN-On-Silicon LEDs Bridgelux, a leading developer and promoter of LED lighting technologies and solutions, and Toshiba Corporation, a world-leading semiconductor manufacturer, today announced that Bridgelux and Toshiba have achieved the industry’s top class 8” GaN on Silicon LED chip emitting 614mW, <3.1V@350mA with 1.1mm square chip, just months after they have engaged in a joint collaborative agreement this year. Bridgelux and Toshiba will further accelerate their development efforts for LED chips, which have seen increasing demand for LCD panels and lightening systems world wide. Read more »
Technology | Jul 07, 2012
LED System Design with Cititzen LEDs (by A. Lohrer, Endrich)
LED System Design with Cititzen LEDs (by A. Lohrer, Endrich) Rapid improvements in high-power LEDs are opening up more and more application possibilities. These go beyond the simple replacement of the light bulb: thanks to fast technology advancements creative lighting solutions such as object illumination that were unthinkable a few years ago are now possible (see Figure - Illuminated Bridge). Recent price trends have resulted in many large lighting companies now exclusively using LEDs as light sources for new developments. Read more »
Fundings + Projects | Jul 13, 2012
Utah Physicists Invent ‘Spintronic’ LED
Utah Physicists Invent ‘Spintronic’ LED University of Utah physicists invented a new “spintronic” organic light-emitting diode or OLED that promises to be brighter, cheaper and more environmentally friendly than the kinds of LEDs now used in television and computer displays, lighting, traffic lights and numerous electronic devices. Read more »
White Paper | Technology | Jul 31, 2012
Cree Announces 170 Lumen-Per-Watt LED Light Bulb Demonstrator
Less than one year after showcasing the 152 lumens-per-watt concept LED bulb, Cree, Inc. (Nasdaq: CREE) delivers a new performance benchmark with the 170 lumens-per-watt (LPW) prototype LED light bulb. The innovations behind the high-performance 170 LPW LED bulb are enabling significantly higher efficacy and lower cost for Cree’s luminaire portfolio and demonstrate Cree’s continued commitment to accelerate the adoption of LED lighting by addressing initial cost and payback – key barriers to widespread LED lighting adoption. Read more »
Fundings + Projects | White Paper | Aug 01, 2012
Researchers Study How to Avoid Charge Traps in Plastic Electronics
Researchers Study How to Avoid Charge Traps in Plastic Electronics Plastic electronics hold the promise of cheap, mass-produced devices. But plastic semiconductors have an important flaw: the electronic current is influenced by “charge traps” in the material. These traps, which have a negative impact on plastic light-emitting diodes and solar cells, are poorly understood. Read more »
White Paper | Technology | Sep 11, 2012
SMART-Project Aims to Develop Logic and Light on a Chip Using GaN-on-Si Technology
The research project Low Energy Electronics Systems (LEES) has started its work with a kick-off meeting. The program’s initiator is the renowned Singapore MIT Alliance for Research and Technology (SMART) Center based in Singapore. The LEES team consists of eminent research and science specialists and is targeting the development of cuttingedge technology to increase energy efficiency and advance high-tech industries that complement microelectronics. Two AIXTRON CRIUS® 1x200 mm systems, which the project managers ordered early this year, will form the technological foundation basis for the LEES project work. They will be available for use in the project from the fourth quarter of 2012. Read more »
Technology | Sep 13, 2012
NTNU Researchers Commercialize Semiconductors Grown on Graphene
NTNU Researchers Commercialize Semiconductors Grown on Graphene 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 »
Products, Materials + Tools | Oct 05, 2012
Key Milestone Reached in OLED Development: cynora Presents New Flexible Prototype
Key Milestone Reached in OLED Development: cynora Presents New Flexible Prototype 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 | Dec 07, 2012
Copper, Gold and Tin for Efficient LED Chips
Copper, Gold and Tin for Efficient LED Chips 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 | Jan 09, 2013
Scientists Mimic Fireflies to Make Brighter LEDs
Scientists Mimic Fireflies to Make Brighter LEDs 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 »
page_peel