In combination with a new package the new UX:3 chip is 50 percent brighter than the precursor package. In combination with an optimized lens, the light is much better distributed.
The chip is used in the Oslux LED, which is therefore considerably more efficient at high currents than previous LEDs and is impressive for its very high luminous efficiency over a small area.
At a distance of one meter, for instance, such an LED flash evenly illuminates a diagonal of 90 cm. That is sufficient for capturing sharp images even under unfavorable light conditions. At 150 lux, the LED with the UX:3 chip is 50 lux brighter than its predecessor. As a result, high-quality images can be taken even with very flat cell phones or smartphones.
Normally, when taking photos at night with a camera phone, the flash is capable of relatively bright illumination of the middle of the image area, but the corners appear somewhat dark. This is because the luminosity of the LED itself is too low — it just can’t produce enough light — and the lens doesn’t distribute the light evenly enough. This creates a bright circle with dark edges, an effect that occurs especially under very unfavorable light conditions. To change this situation, the researchers from Osram rearranged the internal layout of the LED chip.
The chip consists of a metallic lattice and two semiconductor layers. The lattice conducts the current to the upper layer, from where the electrons move to the lower layer and release energy in the form of light. With conventional LEDs, however, the metallic lattice is positioned above both layers and thus diminishes the light. The effect is similar to what would happen if you place a dark cloth over a light bulb. The researchers at Osram therefore moved the lattice all the way to the bottom, enabling them to increase the “wall plug efficiency,” which describes the relationship between the radiant flux of the chip and the electrical power that flows through it.
Dr. Norbert Aschenbrenner | Siemens InnovationNews
Robot on demand: Mobile machining of aircraft components with high precision
06.12.2016 | Fraunhofer IFAM
IHP presents the fastest silicon-based transistor in the world
05.12.2016 | IHP - Leibniz-Institut für innovative Mikroelektronik
In recent years, lasers with ultrashort pulses (USP) down to the femtosecond range have become established on an industrial scale. They could advance some applications with the much-lauded “cold ablation” – if that meant they would then achieve more throughput. A new generation of process engineering that will address this issue in particular will be discussed at the “4th UKP Workshop – Ultrafast Laser Technology” in April 2017.
Even back in the 1990s, scientists were comparing materials processing with nanosecond, picosecond and femtosesecond pulses. The result was surprising:...
Have you ever wondered how you see the world? Vision is about photons of light, which are packets of energy, interacting with the atoms or molecules in what...
A multi-institutional research collaboration has created a novel approach for fabricating three-dimensional micro-optics through the shape-defined formation of porous silicon (PSi), with broad impacts in integrated optoelectronics, imaging, and photovoltaics.
Working with colleagues at Stanford and The Dow Chemical Company, researchers at the University of Illinois at Urbana-Champaign fabricated 3-D birefringent...
In experiments with magnetic atoms conducted at extremely low temperatures, scientists have demonstrated a unique phase of matter: The atoms form a new type of quantum liquid or quantum droplet state. These so called quantum droplets may preserve their form in absence of external confinement because of quantum effects. The joint team of experimental physicists from Innsbruck and theoretical physicists from Hannover report on their findings in the journal Physical Review X.
“Our Quantum droplets are in the gas phase but they still drop like a rock,” explains experimental physicist Francesca Ferlaino when talking about the...
The Max Planck Institute for Physics (MPP) is opening up a new research field. A workshop from November 21 - 22, 2016 will mark the start of activities for an innovative axion experiment. Axions are still only purely hypothetical particles. Their detection could solve two fundamental problems in particle physics: What dark matter consists of and why it has not yet been possible to directly observe a CP violation for the strong interaction.
The “MADMAX” project is the MPP’s commitment to axion research. Axions are so far only a theoretical prediction and are difficult to detect: on the one hand,...
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07.12.2016 | Health and Medicine
07.12.2016 | Life Sciences
07.12.2016 | Health and Medicine