Technology News
Adopting an LED More Suited to Circadian Entrainment
Since the introduction of LED lights, a lot has been said about risks of blue light for ocular health on the one hand, and the opportunity of circadian entrainment, on the other hand. While a controversial discussion on the first topic is ongoing, the second topic is well accepted. To solve both issues, Bill Chan, President of LiteController Inc. proposes the application of 465-470nm pumped phosphor converted white LEDs with a content of 86% - 92% blue-turquoise light and 8% - 14% blue-violet light. In the article he concentrates on the second topic and proves the benefit of regulating the circadian entrainment more efficiently, maintaining a high typical efficacy of 150 lm/W and good color rendering of CRI 80+ ideally supporting the WELL Building Standard.
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EurekAlert - Annunces: Impurities Enhance Polymer LED Efficiencies
New research published in EPJ B reveals that the higher-than-expected efficiency of PLEDs can be reached through interactions between triplet excitons, and impurities embedded in their polymer layers. Molecular dynamics simulations have shown that the mysteriously high efficiency of polymer LEDs arises from interactions between triplet excitons in their polymer chains, and unpaired electrons in their molecular impurities.
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Offline Lighting Voice Controller — An Alternative to Voice Assistants
The historical evolution of light control by users started with a mechanical switch followed by potentiometer and dimming, touch panels and touch screens, gesture and movement detection control, and ending with voice. Voice control are mostly online speaker independent like Alexa, Google Home and Siri. But there are privacy and security concerns. Filip Michalski, Electronic Engineer, and Cezary Skotak, CEO, from Cezos describe a speaker independent offline voice controls system, explain the technology and discuss the pros and cons.
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ALLOS and KAUST Are Working on High Efficiency Nitride-Based Red LEDs on Si
ALLOS Semiconductors has engaged in a collaboration with Prof. Ohkawa and his team at King Abdullah University of Science and Technology (KAUST) for realizing high efficiency nitride-based red LEDs on large diameter silicon substrates. In the collaboration the teams are addressing fundamental issues like the large lattice mismatch and the quantum-confined Stark effect (QCSE) which are preventing the adoption of red nitride-based LEDs for practical industry usage. In particular, for the emerging field of micro LED displays there is a strong demand to enable red LEDs on large diameter wafers in addition to the established blue and green color LEDs in the nitride system in order to reduce manufacturing complexity and cost.
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Australian Associated Press Recently Wrote: Red Light Could Improve Over-40s' Eyesight
A small LED torch that emits deep red light could help improve declining eyesight, scientists have said: A study by University College London, involving a small sample size of 24 people, has shown that staring at long wavelength light for three minutes every day can "significantly improve vision" in those aged 40 and above.
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Touchscreens Are Going 3D with University of Bristol's Innovative New Spray-On Technique
Inspired by the way an artist creates graffiti on a wall and using a novel combination of sprayable electronics and 3D printing, the technique, called ProtoSpray, allows the creation of displays on surfaces that go beyond the usual rectangular and 2D shapes.
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Printed Perovskite LEDs – An Innovative Technique Towards a New Standard Process of Electronics Manufacturing
A team of researchers from the Helmholtz-Zentrum Berlin (HZB) and Humboldt-Universität zu Berlin has succeeded for the first time in producing light-emitting diodes (LEDs) from a hybrid perovskite semiconductor material using inkjet printing. This opens the door to broad application of these materials in manufacturing many different kinds of electronic components. The scientists achieved the breakthrough with the help of a trick: "inoculating" (or seeding) the surface with specific crystals.
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CEA-Leti Researchers Break Throughput Record for LiFi Communications Using Single GaN Blue Micro-Light-Emitting Diode
CEA-Leti today announced its researchers have broken the throughput world record of 5.1 Gbps in visible light communications (VLC) using a single GaN blue micro- light-emitting diode (LED). Their data transmission rate of 7.7 Gbps achieved with a 10 µm microLED marks another step toward commercialization and widespread use of LiFi communication.
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Pushing Photons - Metasurface Design Methods Can Make LED Light Act More Like Lasers
UC Santa Barbara researchers continue to push the boundaries of LED design a little further with a new method that could pave the way toward more efficient and versatile LED display and lighting technology: In a paper published in Nature Photonics, UCSB electrical and computer engineering professor Jonathan Schuller and collaborators describe this new approach, which could allow a wide variety of LED devices — from virtual reality headsets to automotive lighting — to become more sophisticated and sleeker at the same time.
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Executive Summary on "A Study on the Perception of Full Spectrum LEDs" Published
From a LED producer's perspective, it is essential to have knowledge about the perception of LEDs by human beings. To consolidate existing and gain new knowledge on recently introduced Full Spectrum LEDs, which claim to bring natural light quality into electric lighting appliances, the Fraunhofer Institute for Building Physics (Germany) conducted a study in cooperation with three main LED manufacturers Nichia (Japan), Seoul Semiconductor (Korea), Toshiba Materials (Japan) and the LED gear supplier Lumitronix (Germany).
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Austrian Tech University Graz Revolutionizes 3D Metal Printing Using LEDs
A technology developed at Graz University of Technology uses LED instead of laser sources for the additive manufacturing of metal parts and optimizes 3D metal printing in terms of construction time, metal powder consumption, equipment costs and post-processing effort.
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Repro-Light Consortium Announce Intelligent Workspace Lighting Concept
The pioneering design team at Bartenbach unveils a brand-new intelligent lighting concept set to revolutionize workspace personalization. It is set to deliver a truly user-centric, workspace lighting blueprint for lighting designers to transform workspaces for healthier living. The story began with Bartenbach's involvement in the Repro-light project consortium, funded through the European Commission's Horizon 2020 work program. The scope of the project, "To successfully initiate transformation in the European LED lighting industry, by creating the 'Luminaire of the Future'." Part of this remit was to develop a new customizable lighting system.
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Full Spectrum LEDs Outperform Standard LED Lighting, Study Shows
Full Spectrum LED products outperform conventional solutions, according to a study into the visual impact and perceptual performance of LED lighting by the Fraunhofer Institute for Building Physics (IBP) in Stuttgart, Germany.
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Light Pollution Suppresses Melatonin Production in Perch
Melatonin controls the body clock – high melatonin levels make us feel tired in the evening. However, the hormone also plays an important role in animals' biological rhythms. Artificial light at night – light pollution – can suppress the production of melatonin in fish, even at very low light intensities, a finding established by researchers from IGB.
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Seoul Viosys and SETi's Violeds Technology Proves 99.9% Sterilization of Coronavirus (COVID-19) in 30 Seconds
Seoul Viosys and Sensor Electronic Technology, Inc. ("SETi"), leading global innovators of UV LED products and technology, announced that it has been successful in achieving 99.9% sterilization of coronavirus (COVID-19) in 30 seconds. Tests were conducted with the research group of Korea University, Korea's top rank university, by using a compound semiconductor Violeds technology that is being mass-produced.
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