Technology News - Light Generation

LEDs and OLEDs

Technology | Light Generation | Jul 03, 2014

Significant Technical Progress - BluGlass Demonstrates Best Ever RPCVD (p-GaN) Light Output

Demonstration of light emission at 473nm, with full width half maximum of 22nm, from a RPCVD p-GaN layer grown on a MOCVD partial structure Australian Cleantech innovator, BluGlass Limited, has announced today that it has been successful in demonstrating the best ever p-GaN light output using its propriety technology, Remote Plasma Chemical Vapour Deposition (RPCVD) on an MOCVD partial LED structure. This result is greater than a 10 fold improvement in LED efficiency over the first p-GaN demonstration data published by the company in December 2012, when the same measuring methodology is applied. This has been achieved by making ... Read more »

Technology | Light Generation | Apr 14, 2014

Developing Phosphor-Free White Light from Nanopyramid LEDs

Left: Fabrication schematic for phosphor-free nanopyramid LEDs by nanospherical-lens photolithography. Right: (a) Room-temperature photoluminescence spectra of nanopyramid LEDs with MQWs grown at different temperatures, along with reference structure grown on planar template. (b) Spectrum of ‘white LED’ (blue LED with yellow phosphors). (c) Electroluminescence spectrum of nanopyramid LEDs at 20mA; inset shows corresponding optical microphotograph Researchers in China have used nitride semiconductor nanopyramid structures to create light-emitting diodes (LEDs) with spectra that are similar to those provided by ‘white light’ LEDs with yellow phosphors [Kui Wu et al, J. Appl. Phys., vol115, p123101, 2014]. The researchers are at the Chinese Academy of Sciences’s institutes of Semiconductors and Mechanics, and Tsinghua University. A similar CAS/Tsinghua team previously reported such devices, using a polystyrene nanosphere mask to make holes ... Read more »

Technology | Light Generation | Mar 28, 2014

Osram To Demonstrate The World's Most Efficient LED Replacement Tube at Light+Building

Osram's record-breaking light source was developed by the central research department together with the optical semiconductor and lamp business units An Osram research team has succeeded in constructing the most efficient LED lamp in the world. The lamp in tubular form consumes only half the power of currently common fluorescent and LED tubes, and also achieves significantly superior colour rendering. Read more »

Technology | Light Generation | Mar 26, 2014

Cree Continues to Push the Boundaries of LED Performance by Breaking 300 Lumens-Per-Watt Barrier

According to Cree, the efficacy of the CCT 5150 K LED was measured applying a current of 350 mA at standard room temperature Cree, Inc. records another significant LED milestone with the demonstration of 303 lumens per watt from a white high power LED. Reaching the landmark achievement much faster than previously believed possible, this result surpasses Cree’s previous R&D industry best of 276 lumens per watt announced just over a year ago. Read more »

Technology | Light Generation | Mar 19, 2014

New Technique Makes LEDs Brighter, More Resilient

By coating polar gallium nitride with phosphonic groups, the researchers increased luminescence without increasing energy input (Image Credits: Stewart Wilkins) 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 phosphorus-derived acid. Read more »

Technology | Light Generation | White Paper | Mar 13, 2014

Quantum Materials Secures Los Alamos Thick-Shell Quantum Dot Technology to Increase Brightness

Quantum materials optioning Thick-Shell 'Giant' Quantum Dot patented technology promises improvement in solid-state brightness over conventional nanocrystal quantum dots (QD) Quantum Materials Corporation and Los Alamos National Laboratory's today announce Quantum Materials optioning Thick-Shell 'Giant' Quantum Dot patented technology with the potential of 10 to 100-fold improvement in solid-state brightness over conventional nanocrystal quantum dots (QD). High brightness leads to efficient use of materials and increased performance in electronic displays and solid state (LED) lighting. Read more »

Technology | Light Generation | 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 | Light Generation | 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 | Light Generation | 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 »

Technology | OLEDs | 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 ... Read more »

Technology | Light Generation | White Paper | 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 ... Read more »

Technology | OLEDs | 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 | Light Generation | 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 | Light Generation | 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 »

Technology | Light Generation | White Paper | 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 »

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