LED

The phosphorescent LEDs can reveal the presence of water under backlight. Water causes polymers to break in the LEDs, changing from phosphorescent light (green) to fluorescent light (blue)

Efficient Room-Temperature Phosphorescent OLEDs Developed

The team of Jinsang Kim, a professor of materials science and engineering and chemical engineering at the University of Michigan, developed bright, metal-free, organic, phosphorescent light emitters. »

The newly developed phosphor enhances the quality of color rendition by white-emitting LEDs

New Type of Red Phosphor Makes LEDs More Efficient

Chemists at the Ludwig Maximilian University of Munich (LMU) have developed a new type of red phosphor material for application in light-emitting diodes (LEDs). »

Triangles and pyramids are a key to making phosphorescent organic LEDs more efficient.

Pyramid-Like Arrangement Makes LEDs Brighter

According to the scientists at the University of Michigan, triangular phosphorescent organic light-emitting diodes (PHOLEDs) arranged into a pyramid-like structure shine three times brighter than a flat configuration of LEDs at the same current. »

Cree linear LED T8 lamp

Cree Introduces LED T8 Tubes Aimed at Replacing Fluorescent Lights

Cree, a U.S. multinational manufacturer of semiconductor light-emitting diode (LED) materials and devices, has introduced a series of LED T8 replacement tubes that “finally gives commercial lighting users reasons to switch to LED lighting and stop using linear fluorescent tubes.” »

This new electronic device is simultaneously a LED and a solar cell

Molybdenite LED Doubles as Solar Cell

Researchers at the Swiss Federal Institute of Technology in Lausanne (EPFL), Switzerland, have tapped into the electronic potential of molybdenite (MoS2) by creating diodes that can emit light or absorb it to produce electricity. »

A new processing technique that makes light emitting diodes brighter and more resilient

New Processing Method Makes LEDs Brighter, More Stable

Researchers from North Carolina State University have developed a new processing technique that makes light emitting diodes (LEDs) brighter and more resilient by coating the semiconductor material gallium nitride (GaN) with a layer of phosphonic acid derivatives. »

This graphical representation shows the layers of the 2-D LED and how it emits light.

Scientists Create Thinnest LED Ever

University of Washington scientists have built the thinnest LED ever. It can be used as a source of light energy in electronics. The LED is based off of two-dimensional, flexible semiconductors, making it possible to stack or use in much smaller and more diverse applications than current technology allows. »

Gallium Nitride Transistors Make LED Lamps More Compact, Efficient

Gallium Nitride Transistors Make LED Lamps More Compact, Efficient

Researchers have found a way to make LED lamps even more compact while supplying more light than commercially available models. The key to success: transistors made of the semiconductor material gallium nitride. »

San Diego to Link Street Lights to Industrial Internet

San Diego to Link Street Lights to Industrial Internet

San Diego will soon become the first U.S. city to link its street lights to the Industrial Internet via an “intelligent” lighting system called LightGrid. The new system, which was developed by GE Lighting, will replace 3,000 city lamps with LED lights equipped with GPS beacons and wireless controls technology to measure and manage energy usage. »

Organic light-emitting diodes (OLEDs) — here at the bus stop of the future — will soon come out of printing machines.

Simple Process to Print OLEDs And Solar Cells Developed

Researchers at the Fraunhofer Institute for Applied Polymer Research (IAP), Germany, worked together with mechanical engineering company MBRAUN to develop a production facility able to create inexpensive organic light-emitting diodes (OLEDs) as well as organic solar cells on an industrial scale. »

This illustration demonstrates how bright blue LED light, shone through its complementary yellow phosphor, yields white light.

Guidelines Facilitate More Efficient LED Lighting

By determining simple guidelines, researchers at UC Santa Barbara’s Solid State Lighting & Energy Center (SSLEC) have made it possible to optimize phosphors—a key component in white LED (light-emitting diode) lights—allowing for brighter, more efficient LED lighting. »

OLED emit homogeneous planar light and may be applied to flexible carrier materials. (Photo: Ralph Eckstein)

‘cyFLEX’ Project to Develop Inexpensive OLED Printing Technology

The “cyFLEX” project is aimed at adapting materials for organic light-emitting diodes (OLED) to printing and coating processes. This OLED printing technology can be used in future production of luminous packaging, labels, and billboards. »

The newly invented technology can be applied in many areas, like LED billboard, it can achieve additional energy saving by up to 15%. (Credit: Flickr @ Jimmy Baikovicius http://www.flickr.com/photos/jikatu/)

Innovative High Performance LED Driver to Improve Energy Efficiency

Researchers at the Hong Kong Polytechnic University developed a high performance LED driver with an innovative approach called multi-level PWM (Pulse-Width Modulation), which delivers remarkable improvements in terms of light quality and energy efficiency, when compared to pulse width modulation and linear driver approaches currently used in LED products. »

The Venetian | The Palazzo, in conjunction with the Sands Expo Center, is the first and only property on the Las Vegas Strip to receive U.S. Green Building Council LEED© Gold Certification for Existing Buildings. (Credit: Flickr @ Evo Flash http://www.flickr.com/photos/evoflash/)

Las Vegas Resort Upgrades to Energy Efficient LED Lighting

While the Las Vegas is hardly known for its energy efficiency (in fact, it was even called an “energy consumption nightmare” in the past), now the things are changing for the better. An example of this is the recent move towards a more efficient lighting. For instance, the Las Vegas Sands Corp. is currently completing several major LED lighting upgrades at its iconic resorts, The Venetian|The Palazzo. »

LumiSands cofounders Chang-Ching Tu, left, and Ji Hoo with with a demo showing the warmer, softer hue of the LED bulb (left side) after a film embedded with their red-emitting silicon nanoparticles is placed underneath. The box on the right is an identical, standard LED bulb. (Credit: Mary Levin, University of Washington)

Photoluminescent Nanoparticles Make LEDs Better, Greener, Less Expensive

While LED lamps offer long service life and high energy efficiency, their initial costs are higher than those of fluorescent and incandescent lamps, especially if you want to buy a light bulb with warmer and more appealing hue. Researchers at the University of Washington have created a material they say would make LED bulbs cheaper and greener to manufacture, driving down the price. Their silicon-based photoluminescent nanoparticles soften the blue light emitted by LEDs, creating white light that much closer to sunlight’s natural spectrum. »

A LED connected to a 9V battery (Credit: Flickr @ °Florian http://www.flickr.com/photos/fboyd/)

Scientists Integrate LED, Transistor on the Same Chip

Engineers from the Smart Lighting Engineering Research Center at Rensselaer Polytechnic Institute have successfully integrated a light-emitting diode (LED) and a power transistor on the same gallium nitride (GaN) chip. The ability to integrate LED and a power transistor on one chip opens the way to a new generation of LED technology that would be easier to manufacture, cheaper and significantly more energy efficient. »

This image shows 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. (Credit: Delaina Amos)

Researchers Add Printed OLEDs to the List of Quantum Dots Applications

Quantum dots—portions of matter that has electronic properties intermediate between those of bulk semiconductors and those of discrete molecules—are being studied for use in solar cells, transistors, diode lasers and light emitting diodes. A new promising quantum dots application involves combining them with the organic light-emitting diodes (OLEDs). These “hybrid” OLEDs, also called quantum dot LEDs (QD-LEDs), will have increased efficiency and a larger range of colors than conventional ones. »

CFN's Kim Kisslinger, seen here with a focused-ion beam instrument, reduced the InGaN samples to a thickness of just 20 nanometers to prepare them for electron microscopy. (Credit: BNL)

Electron Microscopy Imaging Solves LED Efficiency Mystery

Ending a long-time controversy concerning the reason behind indium gallium nitride semiconductor efficiency, MIT and Brookhaven Lab scientists have concluded that it definitely has nothing to do with indium-rich clusters. This finding advances fundamental understanding of LED technology and opens new research pathways, that could ultimately lead to more efficient LEDs. »

ORNL scientists are using x-ray diffraction analysis to study nanocrystals (Credit: ORNL)

New Group of Crystals Will Make LED Light Warmer

Scientists at Oak Ridge National Laboratory are studying a new group of crystals to improve materials’ luminescence efficiency. Small crystals that glow different colors may be the missing ingredient for warmer, less clinical LED lighting. »

(Credit: Flikr @ Darren Hurley http://www.flickr.com/people/ironsidevsquincy/)

Dual Color Semiconductor Device Opens Way to Cheaper Lighting

A group of scientists from the Arizona State University have developed a semiconductor device that is capable of emitting two distinct colors simultaneously. An ability to emit light in a wide spectrum range from a single monolithic structure could potentially become a basis for a cheaper and more efficient lighting technology. »

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