KAIST Team Develops Flexible Blue Vertical Micro LEDs
In CES 2018, micro LED TV was spotlighted as a strong candidate for replacing the active-matrix organic light-emitting diode (AMOLED) display. Micro LED is a sub-100 um light source for red, green and blue light, which has advantages of outstanding optical output, ultra-low power consumption, fast response speed, and excellent flexibility. Professor Keon Jae Lee from the Department of Materials Science and Engineering and his team have developed a low cost production technology for thin-film blue flexible vertical micro LEDs (f-VLEDs).
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Smart Printing: Fraunhofer IAP Develops Power Generating Films and Luminescent Glass
New inks for inkjet printers make it possible to print organic displays or solar cells on film and glass for the use in architecture, the textile industry and many other industries.
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Scientists Reveal the Fundamental Limitation of In Concentration in InGaN Solid-State Devices
For the first time an international research group has revealed the core mechanism that limits the indium (In) content in indium gallium nitride ((In, Ga)N) thin films - the key material for blue light emitting diodes (LED). Increasing the In content in InGaN quantum wells is the common approach to shift the emission of III-Nitride based LEDs towards the green and, in particular, red part of the optical spectrum, necessary for the modern RGB devices. The new findings answer the long-standing research question: why does this classical approach fail, when we try to obtain efficient InGaN-based green and red LEDs?
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A New Technology Is Changing the Tunable White Solutions
Tunable white LEDs are one key element of human centric lighting. Until today, different solutions are
currently available but none of them is easy to apply or cost effective enough to speed up the diffusion
of human centric lights in building projects. A new approach for tunable white solutions is able to
provide flexible lighting for multiple occasions without sacrificing output or going over project budget.
Phil Lee, Senior Lighting Engineer from Meteor Lighting will compare this new technology, called
ColorFlip™, to conventional tunable white solutions, and talk about current tunable white issues.
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Realizing Highly Efficient QD LEDs with Metallic Nanostructures at Low Cost
The Korea Advanced Institute of Science and Technology (KAIST) announced that a team of their researchers have discovered a technology that enhances the efficiency of Quantum Dot LEDs. Professor Yong-Hoon Cho from the Department of Physics and his team succeeded in improving the efficiency of Quantum Dot (QD) Light-Emitting Diodes (LEDs) by designing metallic nanostructure substrates.
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Supercomputers Aid Discovery of New, Inexpensive Material to Make LEDs with Excellent Color Quality
A team led by engineers at the University of California San Diego has used data mining and computational tools to discover a new phosphor material for white LEDs that is inexpensive and easy to make. Researchers built prototype white LED light bulbs using the new phosphor. The prototypes exhibited better color quality than many commercial LEDs currently on the market.
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Tech-Talks BREGENZ - Julia Frohleiks, Researcher, University of Duisburg-Essen
In his commentary on technical progress and innovation, Dr. Sejkora said: “In the early stage, in the first
phase of its life cycle, technology is mainly driven by fundamental research.” He went on to say that we
can never predict how a technology will develop. Researchers from the University of Duisburg-Essen,
working in the Nano Energy Technical Center (NETZ), worked on this type of fundamental technology
and their submission received the LpS 2017 Scientific Award. Ms. Julia Frohleiks, a Ph.D. student, was a
major contributor to this research in the group led by Dr. Ekaterina Nannen and accepted the award in
Dr. Nannen’s name. In the following interview she gives some background information and discloses
future research possibilities.
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IP Snapshot: "Nanowired LEDs"
Abstract from the most cited patent (US20030168964A1, Solidlite Corp.) A nanowire light emitting device and display includes a cover substrate , and a transparent conductive substrate mounted on the transparent conductive film and having a surface plated with a metal layer, a nanowire light emitting member mounted on the transparent conductive substrate and having multiple nanowire light emitting diodes each having a structure of P-type, N-type and light emitting layer, and an insulation layer support post mounted between the transparent conductive substrate and the cover substrate for supporting the transparent conductive substrate and the cover substrate.
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Hybrid Quantum Dot Light Emitting Electrochemical Cells
Several new light generation technologies that are overshadowed by LEDs and OLEDs are investigated.
Most of these technologies are in a very early stage of research. One such technology, the LEC technology,
was presented at LpS 2017. Light emitting electrochemical cells can be compared to OLEDs, but they are
based on a much simpler inorganic architecture. The innovation in the presented approach lies in the
combination with quantum dots, resulting in a hybrid solution. This novel attempt with all its consequences
and future prospects was the reason that the LpS Scientific Award jury voted to bestow the award on
Dr. Ekaterina Nannen, Group Leader of the Research Group „Solid State Lighting“ at the Nano-Energie-Technik-
Zentrum (NETZ) of the University Duisburg-Essen and her research team, Julia Frohleiks and Svenja Wepfer.
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Atomistic Calculations Predict that Boron Incorporation Increases the Efficiency of LEDs
High-power white LEDs face the same problem that Michigan Stadium faces on game day -- too many people in too small of a space. Of course, there are no people inside of an LED. But there are many electrons that need to avoid each other and minimize their collisions to keep the LED efficiency high. Using predictive atomistic calculations and high-performance supercomputers at the NERSC computing facility, researchers Logan Williams and Emmanouil Kioupakis at the University of Michigan found that incorporating the element boron into the widely used InGaN (indium-gallium nitride) material can keep electrons from becoming too crowded in LEDs, making the material more efficient at producing light.
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Phosphors & QDs LED Downconverters Report for Lighting & Displays from Yole Développement
“Volume saturation, price pressure and a shifting intellectual property landscape are forcing the LED phosphor & QDs industry into a rationalization phase,” announces Dr. Eric Virey, Senior Technology & Market Analyst, Yole Développement (Yole).
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Eviyos LED Prototype Revolutionizes Smart Headlights
The Eviyos prototype developed by Osram Opto Semiconductors is the world’s first hybrid LED and represents major progress toward the first market-ready smart controllable high-resolution LED. As soon as oncoming traffic is detected the appropriate pixels are automatically switched off so drivers of oncoming vehicles are not dazzled. The prototype, integrated in a demonstrator from Osram Specialty Lighting, were on show for the first time at ISAL from September 25 through 27, 2017 in Darmstadt.
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Quantum Dot Based White LEDs for General Illumination
Colloidal quantum dot based white LEDs can be integrated into commercial products meeting the
stringent reliability requirements for general illumination and providing LED efficiency gains of 5% to 15%
over commercial phosphor based LEDs at CCT’s ranging from 5000 K to 2700 K. Unlike earlier
demonstrations, the QD material is applied in an on-chip configuration resulting in drop-in fit, form,
and function compatibility to existing LED based luminaires and lamps. Ken T. Shimizu, Director,
Novel Technologies and Devices, Research and Development, M. Böhmer, D. Estrada, S. Gangwal,
S. Grabowski, H. Bechtel, E. Kang, K. J. Vampola, D. Chamberlin, O. B. Shchekin, and J. Bhardwaj
from Lumileds showcase the advantages of on-chip QD LEDs: A commercial lamp at 3000K color
temperature and 90 CRI is substituted with QD based LEDs resulting in a system level efficiency gain up
to 17%, attributed to the reduced blue LED droop from the lower drive current and the lower heat sink
temperature when compared to the standard phosphor based LED lamp output.
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OLEDs Applied to Paper-Thin Stainless Steel
Fraunhofer Institute for Organic Electronics, Electron Beam and Plasma Technology FEP, a provider of R&D in the field of organic electronics, will be presenting OLEDs on gauzy stainless steel foil during aimcal 2017 in Tampa/USA, from October 15-18, 2017. The novel application on display in Booth 22 was developed in cooperation with the Nippon Steel & Sumikin Materials Co., Ltd. (NSMAT) and Nippon Steel & Sumitomo Metal Corporation (NSSMC).
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Tracing the Light Inside an LED
The performance of white LEDs can be improved, based on better knowledge of the absorption and scattering of light inside the LED. A new method, developed by the University of Twente in The Netherlands and Philips Lighting, can lead to efficiency improvement and powerful design tools.
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