LEDs & OLEDs

Technology | Jul 29, 2010
Novel Nano-Etched Cavity Makes LEDs 7 Times Brighter
Novel Nano-Etched Cavity Makes LEDs 7 Times Brighter Researchers at the National Institute of Standards and Technology (NIST) have made semiconductor light-emitting diodes (LEDs) more than seven times brighter by etching nanoscale grooves in a surrounding cavity to guide scattered light in one direction. Read more »
Technology | Jul 29, 2010
Paint-on semiconductor outperforms chips
Paint-on semiconductor outperforms chips Researchers at the University of Toronto have created a semiconductor device that outperforms today's conventional chips -- and they made it simply by painting a liquid onto a piece of glass. Read more »
Technology | Jul 29, 2010
Method May Help Optimize Light-emitting Semiconductors
Method May Help Optimize Light-emitting Semiconductors Physicists at JILA have demonstrated an ultrafast laser technique for "seeing" once-hidden electronic behavior in semiconductors, which eventually could be useful in more predictable design of optoelectronic devices, including semiconductor lasers and white light-emitting diodes. Read more »
Technology | Sep 08, 2010
Philips Demonstrates World’s First Mains-Powered White-Light OLED Module
Philips Demonstrates World’s First Mains-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 | Oct 04, 2010
Using Nanostructures to Improve LED Light Emission
Using Nanostructures to Improve LED Light Emission 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 »
Products, Materials + Tools | Nov 19, 2010
Honeycomb™ LED Chip from Verticle Inc.
Honeycomb™ LED Chip from Verticle Inc. Verticle, Inc (www.verticleinc.com) of Dublin, California has announced the world's first hexagonal LED chip. Honeycomb™ LED Chip, named after its hexagonal shape, is a vertically structured LED chip developed especially for high power LED applications. It is expected to bring a higher chip count per wafer and better optical power over conventional square or rectangular type LEDs, said Dr. Mike (M.C.) Yoo, Company CEO. Read more »
Technology | Dec 22, 2010
Quantum Dots Are Not Dots
Quantum Dots Are Not Dots 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 | Jan 26, 2011
Voiding Defects: New Technique Makes LED Lighting More Efficient
Voiding Defects: New Technique Makes LED Lighting More Efficient 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 | Feb 15, 2011
Jewel-Toned Organic Phosphorescent Crystals: A New Class of Light-Emitting Material
Jewel-Toned Organic Phosphorescent Crystals: A New Class of Light-Emitting Material University of Michigan researcher Jinsang Kim and his colleagues have developed a new class of material that shines with phosphorescence—a property that has previously been seen only in non-organic compounds or organometallics. This pure organic compounds that glow in jewel tones could potentially lead to cheaper, more efficient and flexible display screens, among other applications. Read more »
Technology | Mar 16, 2011
From the OSRAM Laboratory: Efficiency Record for Warm White
From the OSRAM Laboratory: Efficiency Record for Warm White OSRAM Opto Semiconductors has set a new laboratory record of 142 lm/W for the efficiency of a warm white LED light source. With a correlated color temperature (CCT) of 2755 K the LED achieves a good color rendering index (CRI) of 81. Measurements were taken under standard conditions: room temperature and pulsed mode at an operating current density of 350 mA/mm². Read more »
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