LED & OLEDs Collection

White Paper | Technology | Feb 05, 2015
Universities Develop Novel LEDs by Band-Structure Engineering in van der Waals Heterostructures
Universities Develop Novel LEDs by Band-Structure Engineering in van der Waals Heterostructures Semi-transparent, flexible electronics are no longer just science-fiction thanks to graphene’s unique properties, University of Manchester researchers have found. Published in the scientific journal Nature Materials, University of Manchester and University of Sheffield researchers show that new 2D ‘designer materials’ can be produced to create flexible, see-through and more efficient electronic devices including semi-transparent LEDs. Read more »
Fundings + Projects | White Paper | Jan 15, 2015
Holst Centre and Flex-o-Fab Take the First Step Towards "Lighting by the Mile"
Holst Centre and Flex-o-Fab Take the First Step Towards "Lighting by the Mile" Researchers from the EU-funded Flex-o-Fab project have successfully fabricated working OLED devices on a flexible barrier layer produced in a roll-to-roll (R2R) process. Produced on a PET plastic film, this breakthrough is a significant first step towards taking flexible OLEDs ‘from lab to fab’ and hence to commercial production. It draws on technical developments achieved within both Flex-o-Fab and Holst Centre’s joint research program into high-performance flexible barriers for organic electronics. Read more »
White Paper | Technology | Jan 15, 2015
Ending the Invisible Threat - Confronting the LED Flickering Issue
Ending the Invisible Threat - Confronting the LED Flickering Issue One of the topics in 2014 International LIGHTFAIR DOE training was “SSL Flicker Fundamentals and Why We Care“ (Michael Poplawski and Naomi Miller 2014),this reignited the industry’s discussion on light modulation. This topic was already raised by ASSIST earlier, where research on human’s level of tolerance to high-frequency flickers have been done and published in several lighting magazines by Rebekah Mullaney, hoping to encourage LED manufacturers and distributors to put more emphasis on finding a permanent solution that is more suitable for people’s well-being. - Andy Fei and Nina Chen from ALT-LED summarize these flicker research results and explain how to avoid flicker issues. Read more »
White Paper | Technology | Jan 09, 2015
Compute Simulation Sheds Light On Why Blue LEDs Are So Tricky To Make
Compute Simulation Sheds Light On Why Blue LEDs Are So Tricky To Make Researchers in our Department of Chemistry have collaborated with groups at University College London (UCL) and Daresbury to uncover the mystery of why blue light-emitting diodes (LEDs) are so difficult to make, by revealing the complex properties of their main component – gallium nitride – using sophisticated computer simulations. Read more »
White Paper | Technology | Jan 09, 2015
LpS 2014 Scientific Award Winner Article: New Binning Strategy for White LEDs
LpS 2014 Scientific Award Winner Article: New Binning Strategy for White LEDs After having recognized the deficiencies of the ANSI binning strategy, which is based on the visually false magnification of MacAdam’s ellipses, Dr. Peter Bodrogi and Prof. Tran Quoc Khanh from the Technical University Darmstadt propose a new binning strategy based on a so-called semantic interpretation to describe and easily communicate the magnitude of acceptable chromaticity differences. Read more »
Products, Materials + Tools
Recipients of the Nobel Prize in Physics Support the Development of Deep-UV LEDs
Recipients of the Nobel Prize in Physics Support the Development of Deep-UV LEDs Profs. Isamu Akasaki, Hiroshi Amano, and Shuji Nakamura received the Nobel Prize in physics in mid-December 2014 for their breakthrough that enabled the development of blue LEDs. In particular, Professor Amano and his team at Nagoya University have worked intensively over the past few years on further development of these semiconductor-based lamps. They provided consulting services to the Japanese firm of Nikkiso Co. Ltd. in the design of the first deep-ultraviolet light-emitting diodes (DUV-LEDs). These novel light sources cover wavelengths from 255 to 350 nm which were previously impossible to generate with LEDs. Fields of application include biotechnology, medicine, and environmental and industrial technology. The rights for marketing activities in Europe are held by Nikkiso subsidiary Lewa GmbH, who presented the technology for the first time in Europe together with Nikkiso at electronica 2014 in Munich. Read more »
White Paper | Technology | Nov 21, 2014
Thermoresponsive PDLC Coating for Smart CCT-Tunable LED Applications
Thermoresponsive PDLC Coating for Smart CCT-Tunable LED Applications When the 2014 Nobel Prize in physics was awarded this October to three Japanese-born scientists for the invention of blue light emitting diodes (LEDs), the prize committee declared LED lamps would light the 21st century. Now researchers from the Netherlands propose a novel way to ensure the lights of the future not only are energy efficient but also emit a cozy warmth. Cornelissen and his colleagues from the Eindhoven University of Technology, Netherlands describe their new LEDs in a paper published in The Optical Society's (OSA) open-access journal Optics Express. Read more »
Technology | Nov 06, 2014
Osram Reports Record Figures for Green InGaN-Based and Conversion LEDs
Osram Reports Record Figures for Green InGaN-Based and Conversion LEDs The “Hi-Q-LED” project funded by Germany’s Federal Ministry of Education and Research (BMBF) has made pioneering advances with green LEDs, greatly diminishing what is known as the “green gap” phenomenon – the significant drop in efficacy in the green spectral range. The result is a green-emitting LED based on indium gallium nitride (InGaN) semiconductors which achieves a record efficacy of 147 lumens per watt (lm/W) at a wavelength of 530 nanometers (nm) and a spectral width of 35 nm. In addition, another green LED developed by combining a blue chip with a phosphor converter has achieved a record-breaking efficacy exceeding 200 lm/W. Read more »
Fundings + Projects | Nov 04, 2014
Light in New Shape - BMBF-Funded Joint Project R2D2
Light in New Shape - BMBF-Funded Joint Project R2D2 The research progresses of the last five years have proven the technical feasibility of the vision of a transparent and flexible light sources with very low energy consumption in the form of first demonstrators. Now the BMBF-funded joint project R2D2 will start in November 2014 aiming at the investigation of production-related processes and technologies for the manufacturing of flexible OLED. Read more »
Technology | Oct 07, 2014
And the Nobel Price 2014 Goes To ... The Inventors of the Blue LED
And the Nobel Price 2014 Goes To ... The Inventors of the Blue LED The Royal Swedish Academy of Sciences has decided to award the Nobel Prize in Physics for 2014 to Isamu Akasaki from the Meijo University, Nagoya, Japan and Nagoya University, Japan, to Hiroshi Amano from the Nagoya University, Japan and to Shuji Nakamura from the University of California, Santa Barbara, CA, USA for the invention of efficient blue light-emitting diodes which has enabled bright and energy-saving white light sources. Read more »
Technology | Sep 25, 2014
Nanotechnology May Lead to Better, Cheaper LEDs
Nanotechnology May Lead to Better, Cheaper LEDs Princeton University researchers have developed a new method to increase the brightness, efficiency and clarity of LEDs, which are widely used on smartphones and portable electronics as well as becoming increasingly common in lighting. Using a new nanoscale structure, the researchers, led by electrical engineering professor Stephen Chou, increased the brightness and efficiency of LEDs made of organic materials (flexible carbon-based sheets) by 57 percent. The researchers also report their method should yield similar improvements in LEDs made in inorganic (silicon-based) materials used most commonly today. Read more »
Technology | Sep 18, 2014
LpR 44 Article: Discomfort Glare Perception of Non-Uniform Light Sources in an Office Setting
LpR 44 Article: Discomfort Glare Perception of Non-Uniform Light Sources in an Office Setting LED based luminaires with different luminance patterns and recently with increasingly non-uniform luminance patterns are becoming mainstream. This trend makes discomfort due to glare an important topic. Based on an office setting and the comparison of results from three different regions, L. M. Geerdinck, J. R. Van Gheluwe and M.C.J.M. Vissenberg from Philips Research have reviewed the currently used formulae to predict discomfort glare to ascertain if they are still valid. Read more »
Fundings + Projects | Sep 17, 2014
Printing Process of Metal Contacts for Reliable Contacting of Flexible OLEDs and Other Devices
Printing Process of Metal Contacts for Reliable Contacting of Flexible OLEDs and Other Devices A significant growth is predicted for the market of flexible devices. The topic “Wearables”, namely intelligent, wearable systems with several useful and funny features is currently one of the major discussion topics. To enjoy more comfort, exceptional designs and higher functionality manufacturers and users ask for flexible electronic devices, like displays, lighting elements or circuit boards. Read more »
White Paper | Technology | Aug 28, 2014
Osram Opto Demonstrates "3D nano LEDs" for White Light and Sees Series Maturity in Coming Years
Osram Opto Demonstrates "3D nano LEDs" for White Light and Sees Series Maturity in Coming Years By making use of nanotechnology, Osram hopes to produce significantly more LED chips with its existing production plant. Osram researchers have for the first time succeeded in manufacturing a so-called "3D nano LED" for white light. The productivity boost is possible due to the special surface characteristics of the LED chip – in contrast to today's standard models, this is not smooth but consists of many adjacent, microscopically small columns with a three-dimensional structure, thus increasing its light-generating area. The new technology is expected to achieve series maturity in coming years, and Osram would then be one of the first companies to use this technology. Read more »
Technology | Jul 03, 2014
Significant Technical Progress - BluGlass Demonstrates Best Ever RPCVD (p-GaN) Light Output
Significant Technical Progress - BluGlass Demonstrates Best Ever RPCVD (p-GaN) Light Output 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 significant improvements in addressing the ‘interface challenge’, a key technical hurdle that has been limiting the p-GaN performance demonstration in the past. Read more »
Technology | Apr 14, 2014
Developing Phosphor-Free White Light from Nanopyramid LEDs
Developing Phosphor-Free White Light from Nanopyramid LEDs 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 for selective-area growth of nanopyramids. Read more »
Technology | Mar 19, 2014
New Technique Makes LEDs Brighter, More Resilient
New Technique Makes LEDs Brighter, More Resilient 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 »
White Paper | Technology | Mar 14, 2014
Quantum Materials Secures Los Alamos Thick-Shell Quantum Dot Technology to Increase Brightness
Quantum Materials Secures Los Alamos Thick-Shell Quantum Dot Technology to Increase Brightness 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 | Mar 11, 2014
Two-Dimensional Material Shows Promise for Optoelectronics
Two-Dimensional Material Shows Promise for Optoelectronics 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 | Mar 11, 2014
Scientists Build Thinnest-Possible LEDs and Find It To Be Stronger, More Energy Efficient
Scientists Build Thinnest-Possible LEDs and Find It To Be Stronger, More Energy Efficient 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 | Feb 24, 2014
A Roadmap to Efficient Green-Blue-Ultraviolet LEDs
A Roadmap to Efficient Green-Blue-Ultraviolet LEDs 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
CPI Manufactures Flexible OLED Lighting Demonstrators 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 »
Technology | Jan 14, 2014
Details of the 200lm/W TLED Lighting Technology Breakthrough Unraveled
Details of the 200lm/W TLED Lighting Technology Breakthrough Unraveled 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
Epistar Lab has Released the Infrared (850nm) Product with High Photoelectric Efficiency 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 »
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