Technology | Mar 11, 2014

Scientists Build Thinnest-Possible LEDs and Find It To Be Stronger, More Energy Efficient

The layers of the novel 2-D LED and how it emits light (Credits: U of Washington) Most modern electronics, from flat-screen TVs and smartphones to wearable technologies and computer monitors, use tiny light-emitting diodes, or LEDs. These LEDs are based off of semiconductors that emit light with the movement of electrons. As devices get smaller and faster, there is more demand for such semiconductors that are tinier, stronger and more energy efficient. Read more »

Technology | Mar 11, 2014

Two-Dimensional Material Shows Promise for Optoelectronics

In the team's experimental setup, electricity was supplied to a tiny piece of tungsten selenide (small rectangle at center) through two gold wires (from top left and right), causing it to emit light (bright area at center), demonstrating its potential as an LED material. Inset: Microscope image shows the teams experimental setup. (Images courtesy of Britt Baugher and Hugh Churchill) A team of MIT researchers has used a novel material that’s just a few atoms thick to create devices that can harness or emit light. This proof-of-concept could lead to ultrathin, lightweight, and flexible photovoltaic cells, light emitting diodes (LEDs), and other optoelectronic devices, they say. Read more »

Technology | Feb 24, 2014

A Roadmap to Efficient Green-Blue-Ultraviolet LEDs

This is a schematic description of processes responsible for light emitting diode (LED) operation. The thick black lines show the energy band diagram of the conventional (a) and proposed (b) LEDs based on GaN/AlN QWs. In the conventional GaN/AlN QW LEDs the polarization field in the GaN layer enhances strongly the rate of the nonradiative Auger processes leading to reduction of the photoluminescence quantum yield and, consequently, to the "droop" effect with increase of the electrical current. In the proposed LEDs (b) the electric field acting on holes in the QW is compensated by a gradual composition variation of the variable-gap GaAlN alloy resulting in a flat valence band potential. The Auger processes in these QWs are completely suppressed and no droop effect is expected to be seen in such LEDs. (Credit: U.S. Naval Research Laboratory) Scientists at the U.S. Naval Research Laboratory (NRL) have suggested a method that could significantly increase the efficiency of green-blue-ultraviolet light-emitting diodes based on GaInN/GaN, AlGaN/GaN, and AlInN/GaN quantum wells. Their approach could enable advances in solid state lighting and the creation of low threshold lasers and high power light emitting diodes (LEDs). Their research is published in the January 25 and November 26, 2013 issues of Applied Physics Letters. Read more »

Fundings & Projects | White Paper | Feb 11, 2014

CPI Manufactures Flexible OLED Lighting Demonstrators

The Centre for Process Innovation (CPI) has produced a range of flexible Organic Light Emitting Diode (OLED) demonstrators on substrates with thickness ranging from 50µm to 125µm The Centre for Process Innovation (CPI) has produced a range of flexible Organic Light Emitting Diode (OLED) demonstrators. Manufactured on CPI’s OLED/OPV Prototyping Line, the devices have been built on a range of substrates with thickness ranging from 50µm to 125µm. The device structure consists of an Indium Tin Oxide anode, evaporated hole injection layer, co-evaporated emissive layer and a conventional cathode. The device chemistry can be modified to produce a variety of colours and is encapsulated using a pressure sensitive adhesive and a commercially available barrier material. Read more »

White Paper | Technology | Jan 24, 2014

Cree Sets New Efficiency Benchmark with First 200 lpw LED Luminaire Prototype

Cree, Inc. raises the performance bar again with the demonstration of the first 200 lumen-per-watt (LPW) LED concept luminaire, which is more than twice the efficiency of the best linear fluorescent luminaires. The latest Department of Energy (DoE) projections* had estimated that this level of luminaire efficiency would not occur until after 2020, but Cree’s latest innovation has made this possible six years sooner than projected. The prototype leverages Cree’s vertical integration with innovations in LED chips, optics, materials technology and novel system design to deliver unprecedented performance. Read more »

Fundings & Projects | Jan 17, 2014

Printed Transparent Electrodes for Flexible OLEDs

Flexible organic light-emitting diodes (OLED) with transparent electrodes © Fraunhofer COMEDD The BMBF-funded project IMAGE for the development of innovative printable electrode materials for high-efficient organic light-emitting diodes and solar cells has been successfully completed. Read more »

Technology | Jan 14, 2014

Details of the 200lm/W TLED Lighting Technology Breakthrough Unraveled

Lamp Technologies Philips is the world’s first to present a lamp prototype that produces a record 200 lumen per watt (lm/W) of high quality warm white light. This LED technology breakthrough brings energy-efficient LED light suitable for general lighting applications to a whole new level. The 200lm/W LED is expected to hit the market in 2015 and will ultimately be used in a wide range of applications. Read more »

Technology | Jan 14, 2014

Epistar Lab has Released the Infrared (850nm) Product with High Photoelectric Efficiency

Wall plug efficiency and external quantum efficiency as a function of LED current EPISTAR LAB is consistently devoting in LED research and design. Lots of forward-looking technologies have been well developed and now applied to LED chip production like novel transparent conductive thin film, compound mirror structure, and new EPI structure design for reducing the absorption of light. The abovementioned innovation technologies will raise the light extraction efficiency and LED performance. Read more »

White Paper | Technology | Nov 04, 2013

UC Santa Barbara: Optimizing Phosphors Using Simple Guidelines Improves Efficiency of Solid-State Lighting

This illustration demonstrates how bright blue LED light, shone through its complementary yellow phosphor, yields white light 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 lighting –– allowing for brighter, more efficient lights. Read more »

White Paper | Technology | Oct 28, 2013

Los Alamos National Laboratory Announces Dramatic Improvements in QD Technology

Postdoctoral researcher Young-Shin Park characterizing emission spectra of LEDs in the Los Alamos National Laboratory optical laboratory. Inset: The quantum dot device structure shown with a transmission electron microscopy (TEM) image of a cross-section of a real device Dramatic advances in the field of quantum dot light emitting diodes (QD-LEDs) could come from recent work by the Nanotechnology and Advanced Spectroscopy team at Los Alamos National Laboratory. Read more »

White Paper | Technology | Oct 23, 2013

Latest LRC Program Aims to Fine Tune Light for Greenhouse Crops & Medicinal Plants

Light and plants expert Tessa Pocock, Ph.D., recently joined the Lighting Research Center (LRC) at Rensselaer Polytechnic Institute as a senior research scientist, leading the development of a new plant physiology lighting program. Her research focuses on plant photosynthesis, and plant development and regulation by light for traditional greenhouse crops and the emerging field of medicinal plants. Read more »

Fundings & Projects | Sep 11, 2013

Project cyFLEX Launched to Develop OLED-Based Luminescent Packaging

cynora OLED-protoypes under ambient light (Credits: cynora) cynora GmbH and the Karlsruhe Institute for Technology (KIT) jointly announce the successful launch of Project cyFLEX. Organic light-emitting diodes (OLEDs) will serve as a basis for generating flexible and luminescent surfaces for smart packaging and advertising applications. Self-luminous packaging and ultrathin flexible advertising panels for all kinds of products may soon become reality and will revolutionize product marketing. Read more »

White Paper | Technology | Sep 04, 2013

Imec and Veeco Announce Collaboration in GaN-on-Si Devices for LED and Power Electronics Applications

Goal of imec's multi-partner GaN-on-Si research and development program is the development of GaN LED on 200 mm silicon substrates with CMOS-compatible infrastructure Nanoelectronics research centre imec of Belgium and Veeco Instruments Inc. (Nasdaq:VECO) are collaborating on a project aimed at lowering the cost of producing gallium nitride on silicon (GaN-on-Si) -based power devices and LEDs. Read more »

Fundings & Projects | Sep 03, 2013

Tridonic Dresden and Fraunhofer COMEDD Present a Desk Luminaire with Flexible OLED from the Roll

The R2Flex desk luminaire demonstrator (inset) is built of the curved flexible OLED on metal substrate The joint OLED project R2Flex has been successfully finished now. As a result Fraunhofer COMEDD and Tridonic Dresden (formerly LEDON OLED Lighting) present a demonstrator of a desk luminaire with flexible OLED. The joint project R2Flex dealt with the production of highly efficient organic devices on flexible substrates, manufactured in a roll-to-roll process technology. R2Flex was funded by the Federal Ministry for Education and Research (BMBF) with a total sum of about 11 million Euros over a period of 2.5 years. Read more »

Technology | Aug 27, 2013

“1 bin” Wavelength LED Wafer Is Demonstrated by Azzurro

Azzurro LED Technologies demonstrates narrow tolerances of their proprietary GaN-on-SI process Azzurro LED Technologies announced the breaking news during a talk at ICNS-10 today. While showing production values of less than 3 nm wavelength uniformity, the 1.0 nm result came straight from development. The record 1.0 nm result demonstrates the capability to achieve “1 bin” GaN-on-Si LED wafers with Azzurro’s technology. Read more »

FEATURED

Nationstar Overall Layout in UV LED Market

Nationstar Overall Layout in UV LED Market In August 2018, Nationstar set up the Non-visual Light Source Business Division, focusing on IR LED, UV LED, animal and plant lighting. Nationstar has been fully laid out on UVA/UVB/UVC. Since 2016, Nationstar has launched near-ultraviolet LED, deep-ultraviolet LED and modules, with wide wavelength ... Read more »

EDITORIAL

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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