Technologies | OLEDs | Light Conversion | May 13, 2016

Research on OLEDs with Ultrathin Emissive Layers and a Spacer-Free Structure

Research on OLEDs with Ultrathin Emissive Layers and a Spacer-Free Structure Since C.W Tang demonstrated the first organic light-emitting diodes (OLEDs) based on a double-layer structure of organic materials in 1987, flat-panel displays and lighting applications based on OLED technology have grown dramatically because of their attractive features such as ultra-thin structure, light-weight and flexibility. To achieve a desirable OLED performance, a host-dopant system is adopted. This not only leads to an increase in material cost and device processing time, but also makes it difficult to control dopant concentration accurately. Therefore, OLEDs with dopant-free and ultrathin emissive layers (UEMLs) have aroused much attention. Shengfan Wu, Sihua Li, Qi Sun, Chenchao Huang & Man-Keung Fung recently published the results of their research on such ultrathin emissive layers (UEMLs) of phosphorescent materials for OLED applications. Read more »

Technologies | LEDs | White LEDs | Feb 25, 2016

Cree Announces Outstanding R&D LED Efficacy Combined with Superior Color Quality

Cree Announces Outstanding R&D LED Efficacy Combined with Superior Color Quality Cree, Inc. records another LED industry first with the demonstration of a single high-power LED delivering nearly 1,600 lumens at 134 lumens-per-watt (LPW) with similar color quality as an incandescent light bulb. With this result, Cree achieved a breakthrough 25 percent increase in lumens per watt (LPW) over production LEDs of similar color quality under operating conditions found in real-world LED lighting applications. This important milestone coupled with Cree’s latest SC5 Technology™ platform will lead to LED systems with increased performance, lower cost and better light. Read more »

Technologies | LEDs | GaN-on-Si | Jan 18, 2016

Plessey Builds LEDs in Cubic GaN on 3C-SiC/Si To Overcome The Green Gap

Plessey Builds LEDs in Cubic GaN on 3C-SiC/Si To Overcome The Green Gap Plessey, Anvil Semiconductors and the University of Cambridge announced today that they are working together to fabricate high efficiency LEDs in cubic GaN grown on Anvil's 3C-SiC / Si substrates. Cubic GaN has the potential to overcome the problems caused in conventional LEDs by the strong internal electric fields which impair carrier recombination and contribute to efficiency droop. This is particularly true for green LEDs where the internal electric fields are stronger and are believed to cause a rapid reduction in efficiency at green wavelengths known as "the green gap". The availability of cubic GaN from a readily commercialisable process on large diameter silicon wafers is as a key enabler for increasing the efficiency of green LEDs and reducing the cost of LED lighting. Read more »

Technologies | LEDs | Material Science | Jan 13, 2016

Uncovering Oxygen’s Role in Enhancing Red Eu-Doped GaN LEDs

Uncovering Oxygen’s Role in Enhancing Red Eu-Doped GaN LEDs Oxygen is indispensable to animal and plant life, but its presence in the wrong places can feed a fire and cause iron to rust. In the fabrication of solid state lighting devices, scientists are learning, oxygen also plays a two-edged role. While oxygen can impede the effectiveness of gallium nitride (GaN), an enabling material for LEDs, small amounts of oxygen in some cases are needed to enhance the devices’ optical properties. GaN doped with europium (Eu), which could provide the red color in LEDs and other displays, is one such case. Read more »

Technologies | Light Generation | Jan 12, 2016

Innovation Could Revive Incandescent Lighting, Bring More Efficient Solar Cells

Innovation Could Revive Incandescent Lighting, Bring More Efficient Solar Cells Incandescent lighting could make a comeback with a new type of filter that "recycles" infrared photons and improves efficiency, an innovation that also could enable solar cells to convert heat into electricity more efficiently than conventional photovoltaic technology. Read more »

Technologies | Research | Light Generation | Health | Perception | Simulation Tools | Jan 04, 2016

Latest Research Publications in the Journal of Solid State Lighting

Latest Research Publications in the Journal of Solid State Lighting On December 24th and 29th, 2015, three new articles have been published in the SpringerOpen Journal of Solid State Lighting. The three articles are titled "Optical Role of Die Attach Adhesive for White LED Emitters: Light Output Enhancement without Chip-Level Reflectors", "The Importance of Intrinsically Photosensitive Retinal Ganglion Cells and Implications for Lighting Design", and "Towards Perceptual Accuracy in 3D Visualizations of Illuminated Indoor Environments". Read more »

Technologies | Light Conversion | Quantum Dots | Nov 25, 2015

Cadmium-Free Quantum Dot Technology in LED Lighting

Cadmium-Free Quantum Dot Materials (Photo by Katharina Fink) Nanoco and its partner Marl International, a pioneer of the LED lighting industry, demonstrated four product lines based on Nanoco’s CFQD® quantum dot film technology last week at LuxLive. The CFQD® Quantum Dot technology as a revolutionary solution for high-end lighting applications in retail and specialty, architecture, and agriculture, where maintaining true-to-life color representations maximizes user experience and value. Read more »

Technologies | LEDs | Light Conversion | Sep 01, 2015

FAU Researchers Create the World's First White LEDs Based on Fluorescent Proteins

Gel-like networks consist of a concentrated aqueous protein solution and a polymer compound (Image: Michael Weber) LEDs are up to 80 percent more energy-efficient than normal light bulbs and last around five times as long as energy-saving light bulbs. As a result they are being used more and more frequently as a source of light. Nevertheless, white LEDs still have room for improvement, as current manufacturing processes are either very expensive or result in the lifetime of the LEDs being reduced. Researchers at FAU have now developed a new, rather unusual manufacturing method: their LEDs are partly made of fluorescent proteins. Read more »

Technology | Aug 21, 2015

Researchers Propose New Technology without Rare Earth Metals for LED Lighting

An LED coated with a yellow “phosphor” is shown turned off (left) and then turned on (right). This “green” LED is inexpensive and provides warm white light (Credit: Zhichao Hu, Ph.D.) At the 250th meeting of the American Chemical Society a novel approach to generate white light without using rare earth metals was presented. The reaserachers claim that this approach will lead to cheaper warm white LEDs than the currently used technologies. A press conference on this topic was held on Wednesday, Aug. 19, at 9 a.m. Eastern time in the Boston Convention & Exhibition Center. Read more »

Technology | Aug 20, 2015

Researchers from Oregon State University Develop Quantum Dot Technology that may Help Light the Future

The orange color in the letters “OSU” is produced from “quantum dots” viewed under a microscope, as they absorb blue light and emit the light as orange – an illustration of some of the potential of new technology being developed at Oregon State University. (Image courtesy of Oregon State University) Advances at Oregon State University in manufacturing technology for quantum dots may soon lead to a new generation of LED lighting that produces a more user-friendly white light, while using less toxic materials and low-cost manufacturing processes that take advantage of simple microwave heating. Read more »

White Paper | Technology | Jul 21, 2015

Litecool Demonstrates that Narrow Beam LED Packages Are a Real Possibility

Litecool have shown promising results for new LED package design that gives focused light beams with no secondary optics or reflectors Litecool has been working on various LED package designs to give luminaire manufacturers an LED package that doesn’t need any further lensing or reflectors to give the desired beam patterns for lighting applications. Read more »

White Paper | Technology | May 27, 2015

BluGlass Demonstrates Improved Performance Results for Green RPCVD Manufactured p-GaN LEDs

Green light emission from RPCVD p-GaN layers grown on MOCVD MQWs BluGlass has succeeded in its initial experimentation of applying low temperature RPCVD p-GaN to Green LED applications with highly promising results. These results show that the green LEDs produced using RPCVD p-GaN are demonstrating greater efficiency than the BluGlass grown MOCVD benchmark LEDs using the exact same MOCVD grown multi-quantum wells (MQWs), the critical light emitting region of an LED device. Read more »

Fundings + Projects | Mar 17, 2015

Fraunhofer FEP Presented Transparent Color Tunable OLED

The color tunable OLED modules have a diameter of 55 mm with an active light area of 42 mm The project LOIGB (LED and OLED integration into glass and plastic composites for the use in lighting systems for railway and further applications) has been successfully completed. The results were presented at LOPEC 2015 (March 4th – 5th, 2015, Munich, hall B0, booth 230). Read more »

White Paper | Technology | Feb 17, 2015

The Future of More Efficient LEDs and Lasers Probably Starts in 2D

Researchers at The Ohio State University have developed a technique for making one-atom-thick sheets of germanium for eventual use in advanced electronics. Already in 2010, MIT's Material Research Group demonstrated the first germanium laser (Photo: Dominick Reuter/MIT) The future of electronics could lie in a material from its past, as researchers from The Ohio State University work to turn germanium - the material of 1940s transistors - into a potential replacement for silicon. Read more »

White Paper | Technology | Feb 16, 2015

Osram Improves Efficiency of Blue LED Chips by Reducing Forward Voltage

Osram experts have significantly reduced the value of the forward voltage, compared with the data sheet for the previous Osram Oslon Square Osram Opto Semiconductors has achieved one of the best values in the world in terms of forward voltage for blue high-current chips. This has led to an increase in efficiency of up to eight percent. Optimized InGaN chips (Indium-Gallium-Nitride) featuring UX:3 chip technology are the basis for blue or white LEDs – and are already used in production. Osram experts also see considerable potential for reducing the value by a further 20 to 30 millivolts (mV) by the summer of 2015 – offering a further boost in efficiency. Read more »

FEATURED

NICHIA LED Technology Presented at LICHTWOCHE München

NICHIA LED Technology Presented at LICHTWOCHE München LED manufacturer NICHIA, a specialist in highly efficient lighting, Human Centric Lighting and the imitation of natural light, will participate in the Munich Lichtwoche 2021 from 5 to 12 November with a light installation, two presentations and a discussion on the topic of UV-C. The light ... Read more »

EDITORIAL

deLIGHTed Talks: Good Light – Good Life in Wintertime, November 3, 2021

deLIGHTed Talks: Good Light – Good Life in Wintertime,  November 3, 2021 The Good Light Group, together with the Society for Light Treatment and Biological Rhythms (SLTBR), the Daylight Academy (DLA), the International Association of Lighting Designers (IALD), and Luger Research (LR), are organizing and presenting the “Good Light – Good Life” lectures. The webinar ... Read more »

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