Articles tagged with Light Emitting Diodes
Scientists at UCL have discovered the root of the problem in making blue LEDs by examining gallium nitride's unusual behavior using sophisticated computer simulations. The study reveals that doping with magnesium is necessary to achieve the desired properties, but the complexity of the process was previously unknown.
Researchers at UC Berkeley have developed a new organic optoelectronic sensor that can accurately measure blood-oxygen levels and is thin, flexible, and disposable. The device uses red and green light to detect changes in oxygen saturation levels, making it potentially cheaper and more convenient than conventional pulse oximeters.
Researchers investigated GaN-based LED structure irradiation with protons and found increased resistance in p-type GaN layers compared to n-type. The observed increase is attributed to lower initial carrier density in p-type GaN, resulting from inadequate doping technology.
Scientists develop a thermoresponsive coating that changes the color of white LEDs when dimmed, creating a warmer glow. This innovative technology uses liquid crystal and polymeric materials to create a temperature-dependent shift in light emission.
A team of researchers from Johns Hopkins Medicine has discovered a novel blood vessel receptor that causes relaxation in response to light. This finding may lead to the development of new therapeutic options for vascular diseases, such as Raynaud's phenomenon.
Researchers are experimenting with smart spaces that track users' gestures and separate shadows from light, enabling a continuous flow of data wirelessly. The integrated visible light communication project aims to bridge the gap in VLC's practical systems and networking problems.
Researchers at Washington University in St. Louis have developed a method to reverse optical loss and increase laser intensity by modulating loss in the system. By adding loss to a laser system, they achieved energy gains and demonstrated new nonlinear phenomena.
Scientists have developed a new family of materials for making household LED bulbs without using rare earth elements, which are increasingly expensive. These materials, made from copper iodide, offer a warm white glow and low-cost solution process, showing significant promise for general lighting applications.
Researchers have developed a new type of energy-efficient flat light source using highly crystalline single-walled carbon nanotubes as field emitters, demonstrating potential for low-power lighting devices. The device has a brightness efficiency of 60 Lumen per Watt and requires only 0.1 Watt of power consumption.
Duke University researchers have developed a way to increase the photon emission rate of fluorescent molecules, reaching record levels. This breakthrough has significant implications for ultrafast LEDs and quantum cryptography, enabling secure communication that could not be hacked.
Researchers at the University of Michigan have extended the lifetime of blue organic light emitting diodes by a factor of 10, improving OLED efficiencies for smartphones and large-screen TVs. The new design spreads out light-producing energy to prevent damaging synergy, resulting in a tenfold increase in lifetime.
The researchers created a new nanoscale structure called PlaCSH that increases the brightness and efficiency of LEDs made of organic materials by 58 percent. The method also improves picture clarity of LED displays by 400 percent.
A Korean research team has successfully grown gallium nitride micro-rods on graphene substrates, enabling the creation of bendable light-emitting diodes. The technology has significant implications for next-generation electronics and optoelectronics devices.
Researchers equipped a robot with a novel tactile sensor, allowing it to grasp and manipulate objects in unprecedented ways. The sensor uses optics and computer-vision algorithms to infer the three-dimensional structure of surfaces, giving the robot feedback in real-time.
Researchers are studying nature's secrets to develop efficient light-based technologies. From seashells to spider wings, scientists are discovering inspiration in the natural world to create innovative solutions for energy, healthcare, and communications.
Researchers have discovered a way to control the properties of quantum dots by using ultrathin layers of metal oxides. This new approach makes quantum dots glow brighter and enhances their emission efficiency, which is crucial for applications such as sensors, light-emitting diodes, and solar cells.
Scientists replicated the structure of compound eyes to create miniature devices that emit light uniformly in all directions. The findings have potential applications for extremely wide field-of-view detectors, enabling new technologies.
Researchers have developed a new technology called 3M quantum dot enhancement film (QDEF) that efficiently makes liquid crystal display (LCD) screens more richly colored. The QDs produce specific colors of light based on their size, allowing for improved color gamut and reduced energy consumption compared to traditional LCDs.
A hybrid form of perovskite has been used to make high-brightness LEDs with a simple and scalable process, potentially replacing conventional methods. The results could provide a lot of value to the flat-panel display industry.
A new study shows that LED lighting can produce favorable results in greenhouse grown annual bedding plant seedlings. The optimal LED red:blue light ratio was found to be between 70:30 and 100:0, resulting in higher stem caliper and root dry mass compared to high-pressure sodium lamps.
A team of researchers created a model that can predict the level of discomfort experienced by drivers under various LED lighting conditions. The study suggests minimizing light hitting at an observer's eyes and luminance contrast between streetlights and backgrounds to minimize glare.
Researchers at the University of Illinois have developed a new technique to record near-field optical information in nanoantennas, enabling the creation of optofluidic channels without walls. This technology has potential applications for optical data storage and other photonic applications.
Researchers have developed a method of shockless defibrillation using optogenetics, achieving cardioversion into sinus rhythm without pain. The technique involves genetically inserting depolarising ion channels into the heart that can be activated by light, promising a new approach for treating atrial fibrillation.
Researchers found that specific LED treatments were more effective than high-pressure sodium lighting for greenhouse tomatoes, increasing fruit and biomass production. The study's results show that LEDs can be customized to target specific wavelengths used by plants, leading to improved plant growth.
Researchers at LMU Munich have developed a novel red phosphor material that significantly enhances the performance of white-emitting LEDs. The new material generates 14% more light than conventional white-light LEDs while maintaining an excellent color rendering index.
Researchers at NIST have created a new laser-based instrument that simulates sunlight across a broad spectrum, allowing for accurate testing of solar cell properties and potential efficiency boosts. The instrument uses optical-fiber amplifier technology to boost power and a photonic crystal fiber to broaden the spectrum.
Researchers found that different LED light sources render white differently, affecting product appearance. Participants struggled to distinguish between cards under blue-pumped LEDs, highlighting the need for spectrum engineering to accurately render whiteness.
Researchers developed an optical diode with nonreciprocal light transmission, eliminating backflow of light. The device enhances light transmission in one direction, leading to faster and cooler computers.
Researchers found that reducing indium nitride's dimensions can produce green light with higher energy, leading to more efficient LEDs. The nanostructures can be tailored to emit different colors of light, enabling the creation of natural-looking white lighting.
Researchers at NC State University have developed a new processing technique that increases luminescence in LEDs by coating gallium nitride (GaN) with phosphorus-derived acid. This enhances the material's stability, making it more suitable for biomedical applications such as implantable sensors.
Researchers at the University of Toronto have successfully generated entangled photons using a combination of light-emitting diodes and superconductors. This breakthrough could lead to significant advancements in quantum computing, communication, and other fields.
LEDs are expected to capture up to 90% of the lighting market by 2020, offering environmental benefits and high efficiency. GaN transistors enable faster switching speeds, leading to reduced energy consumption and increased light output.
MIT researchers have successfully created devices that harness or emit light using a novel material called tungsten diselenide, which is just a few atoms thick. This breakthrough could lead to the development of ultrathin, lightweight, and flexible photovoltaic cells, LEDs, and other optoelectronic devices.
University of Washington researchers develop two-dimensional, flexible semiconductors to build the thinnest-known LED, only three atoms thick yet mechanically strong. The LED can be used in a wide range of applications, including lighting and optical communication, offering high energy efficiency and miniaturization possibilities.
Researchers at Vienna University of Technology have created the world's thinnest solar cells using tungsten diselenide, a material that can absorb light and convert it into electrical power. The ultrathin layers exhibit high transparency and efficiency, making them suitable for flexible displays and glass facades.
Researchers at Linköping University have developed a method to emit polarized light directly from quantum dots, achieving an average polarization of 84%. This breakthrough enables the creation of more efficient polarized light-emitting diodes for LCD screens and wiretap-proof communications.
Researchers have developed a new artificial metamaterial that increases the light intensity and blink speed of a fluorescent dye molecule, speeding up underwater optical communications by 76 times. The material could eventually replace acoustic communications systems for short distance applications.
Researchers at MIT have developed a new transparent display system that can project images onto glass while maintaining transparency, enabling wide-angle views. The system uses nanoparticles to scatter specific wavelengths of light, allowing for clear visibility through the display.
The new camera uses an encoding technique to calculate distance, outperforming existing devices in conditions like rain or fog. It can be used in medical imaging, collision-avoidance detectors, and interactive gaming.
Researchers found that a mixture of blue and red LEDs enhances lettuce growth rate, biomass accumulation, and antioxidant compound production. Red LED alone stimulates biomass but induces abnormal leaf shape and negative effects on antioxidants.
Researchers have developed a novel type of OLED that shows promise for high conversion efficiencies, potentially leading to cheaper displays. The new compounds can store electrical energy for longer periods, allowing for more efficient light generation and reduced heat production.
Researchers at UC Santa Barbara's SSLEC discovered simple guidelines to optimize phosphors in white LED lighting, yielding brighter and more efficient lights. The breakthrough paves the way for high-efficiency solid-state lighting with potential to replace lower-efficiency incandescent and fluorescent bulbs.
Researchers at Los Alamos National Laboratory have developed a new generation of engineered quantum dots to reduce wasteful charge-carrier interactions in QD-LEDs. This breakthrough aims to improve the efficiency and operating lifetime of these devices, making them more suitable for lighting applications.
The ASU group, in collaboration with Georgia Tech, has developed a new approach to growing InGaN crystals, promising to move photovoltaic solar cell technology toward record-breaking efficiencies. The technique, called metal-modulated epitaxy, allows for the growth of ideal crystals with uniform composition and lattice alignment.
Scientists have developed a way to generate electric current by rubbing or tapping paper made of everyday materials, such as polytetrafluoroethylene and plastic sheets. The created energy can be used to power devices like LED arrays, e-ink displays, and sound buzzers.
Researchers at the University of Utah created a new organic molecule shaped like rotelle – wagon-wheel pasta – that depolarizes light, increasing LED efficiency. This breakthrough allows for more efficient OLED displays, promising longer battery life in smartphones and TVs.
Researchers at University of California, Santa Barbara, have devised a new method for creating high-power white light using a laser diode in combination with inorganic phosphors. The resulting lighting options are high in efficiency and have been shown to achieve a luminous flux comparable to current high-brightness white LEDs.
Researchers at the University of Utah have created a polymer that emits light in multiple colors, including blue and red, and can be tuned to cover the entire visible spectrum. This breakthrough holds promise for more efficient and less expensive white organic LEDs, which could replace traditional light bulbs.
Researchers at Ohio State University have developed a new kind of ultraviolet LED that emits light at specific wavelengths, making it suitable for commercial applications such as chemical detection, disinfection, and UV curing. The device runs on lower voltages than existing methods, making it more compact and potentially cost-effective.
Researchers at Georgia Institute of Technology develop a sensor device that converts mechanical pressure into light signals, allowing for high-resolution optical detection. The device has the potential to provide an artificial sense of touch and improve human-machine interfaces.
Researchers at Rensselaer Polytechnic Institute have identified electron leakage as the culprit behind LED efficiency droop, a flaw that causes LEDs to lose up to 20% of their efficiency. The discovery may lead to new technologies to solve the problem and develop stronger LEDs.
Researchers have developed new techniques using lasers, LEDs, and optics to visualize and analyze the skin's structure and function. These methods hold promise for various medical applications, including burn treatment, cancer detection, and wound healing.
Researchers from UNIST developed a new plasmonic material that enhances performance in both polymer light-emitting diodes (PLEDs) and polymer solar cells (PSCs), achieving world-record high efficiency, with PLEDs reaching up to 27.16 cd A-1 and PSCs producing enhanced power conversion efficiency (PCE) of up to 8.31%.
Researchers from the University of Louisville have developed new materials and production methods for commercially feasible quantum dot LEDs, increasing efficiency and color range. The innovative inkjet printing technique enables mass production, making these green lighting devices potentially affordable.
A new approach using low irradiance ultra-violet (UV) light has been developed to slow down the rot of strawberries, doubling their shelf life from five to nine days. This technology uses a novel device incorporating light-emitting diodes (LEDs) that emit UV at wavelengths found in sunlight.
A Mayo Clinic study suggests that dimming smartphone brightness and holding devices at least 14 inches from the face can reduce light exposure's impact on melatonin levels, leading to better sleep. The research found that only high brightness settings posed a risk to sleep, while mid or low settings were safe.
A new semiconductor device has been created that can emit two distinct colors, opening up the possibility of using LEDs universally for cheap and efficient lighting. The device is more energy efficient than traditional LEDs as it emits light in a narrower spectral line.
A new LED streetlight design harnesses high-efficiency LEDs to provide uniform illumination while minimizing light pollution and glare. The design achieves an optical utilization factor of 51-81 percent, reducing light pollution by up to a fifth.
Researchers at North Carolina State University have created new semiconductor devices using zinc oxide (ZnO), including efficient ultraviolet (UV) lasers and LED devices. These devices can be used in sensors and drinking water treatment, among other applications.
Scientists at UC Santa Barbara have identified Auger recombination as the mechanism behind the LED 'droop' phenomenon, a drop in light produced when a higher current is applied. This discovery is expected to lead to new ways to design LEDs with significantly higher light emission efficiencies.