Articles tagged with Light Emitting Diodes
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.
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.
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 developed tiny devices containing light-emitting diodes (LEDs) to activate brain cells with light. Using these devices, mice were taught to poke their noses through a hole in a maze, triggering the system to release dopamine and associate rewards, revealing potential for treating depression, anxiety, and addiction.
Researchers developed ultrathin, flexible optoelectronic devices, including LEDs the size of individual neurons, to illuminate brain mysteries. These devices enable precise control and direct interaction with brain tissue, opening up new ways for neuroscientists to study complex behaviors and neural circuits.
McGill researchers demonstrate ability to modulate light using laser-pulse inputs to manipulate quantum mechanical state of semiconductor nanocrystals. This breakthrough could lead to the development of optical transistors, which would enable faster and more efficient data processing in telecommunications networks.
For the first time, researchers from the University of Pennsylvania have successfully enabled 'bulk' silicon to emit broad-spectrum, visible light. This breakthrough enables the use of elemental silicon in both electronic and photonic components, paving the way for more efficient and integrated devices.
Researchers from KIT and the University of Toronto have successfully manufactured highly efficient light-emitting diodes using silicon nanocrystals. The SiLEDs can produce light in various colors and have a surprising long-term stability, making them an attractive alternative to existing LEDs.
Researchers at Stanford have developed a light-emitting probe that can be injected into individual cells without harm. The device uses photonic cavities to amplify light and detect specific biomolecules, paving the way for real-time sensing and monitoring of cellular biology.
Researchers at Penn State have successfully created single layers of the rare mineral tungstenite, forming triangular structures that exhibit photoluminescent properties. These findings hold promise for various optical technologies, including light detection and laser technology.
Researchers are developing new transparent contact electrodes using materials like graphene and carbon nanostructures, which offer improved conductivity and transparency compared to traditional metal oxides. These new materials have the potential to be combined with conventional solutions or used in entirely new applications.
The University of Georgia scientists have fabricated the world's first LED that emits a warm white light using a single phosphor with a single emitting center. The new material achieves a warm color temperature while maintaining accurate color rendition, ideal for indoor lighting.
Researchers developed a bio-inspired coating that enhances LED light extraction by up to 55 percent. The innovative design mimics the natural structure of firefly lanterns, which reduces internal reflections and allows more light to escape, ultimately making LEDs brighter while using less energy.
The Rice team's device can modulate a signal at more than 10 gigabits per second, making it suitable for real-time video processing and high-speed data throughput. This breakthrough has the potential to scale up the capability of optical information processing systems by several magnitudes.
International experts warn about the adverse effects of exposure to light at night, particularly LED lighting, on circadian rhythms in nature and human health. The panel highlighted the harm caused by short-wavelength illumination to various species, including mammals, birds, and plants.
A new report from DOE's Pacific Northwest National Laboratory and N14 Energy Limited reveals LEDs are more environmentally friendly than CFLs and incandescent lights. The study found that as technology improves, LEDs will continue to gain an edge, with potential for a 50% reduction in environmental impacts within five years.
Researchers found that more efficient lighting leads to increased productivity, rather than lower energy consumption. Historically, improvements in lighting have resulted in higher light consumption, not savings.
The new technology allows approximately 90% of unpolarized light to be polarized and used by the projector, reducing heat generation and enabling more compact designs. This innovation has significant implications for LC projectors, including longer battery life and increased brightness with reduced power consumption.
Researchers developed a new spin-polarized organic LED (spin OLED) that can be brighter than regular organic LEDs, producing an orange color. The device uses a unique property called spin to transmit information, enabling the creation of 'spintronic' technology.
Scientists successfully grow nanorods of zinc oxide on a thin layer of polydiethylflourene, creating white LEDs that can be printed on paper or wallpaper for display purposes. This breakthrough method uses chemical methods and has the potential to enable mass production of flexible electronics.
Researchers at Carnegie Mellon University's Robotics Institute have developed a smart headlight system that reduces glare caused by rain and snow. The system uses a camera to track raindrops and adjusts the light projection accordingly, eliminating 70-80% of visible rain during heavy storms.
Researchers have successfully transferred gallium nitride LEDs from silicon to copper substrates, reducing the quantum confined stark effect and increasing light output. The new substrate design eliminates absorptive materials, electrode shading, and improves crystal orientation, leading to enhanced efficiency and crack-free structures.
Scientists have developed a new type of nanostructured metamaterial that can dramatically change the properties of light, leading to potential breakthroughs in advanced solar cells and quantum computing. The metamaterial combines layers of silver and titanium oxide with tiny quantum dots, resulting in hyperbolic light behavior.
A new retinal prosthesis uses tiny solar-panel-like cells and near-infrared light to stimulate photoreceptor cells and activate neurons in the retina. This device aims to help people suffering from retinal degenerative diseases such as age-related macular degeneration and retinitis pigmentosa.
Researchers from California and Japan have devised a new LED design that avoids efficiency droop, a major problem limiting solid-state lighting growth. The breakthrough could lead to more energy-efficient and affordable LED lighting, with potential applications in household bulbs.
Researchers have developed portable gas sensors that can monitor ozone, greenhouse gases, and air pollutants with high-resolution mapping capabilities. The sensors use various technologies, including laser sensors and deep ultraviolet LEDs, to detect small amounts of atmospheric gases.
A team of researchers has created glass-based inorganic LEDs that produce light in the ultraviolet range, paving the way for implantable biomedical devices. The new devices are scalable, chemically stable, and can be used in harsh environments, making them suitable for applications such as medical diagnostics and treatment.
Researchers at MIT have developed a method to precisely control the width and composition of nanowires as they grow, enabling complex structures optimally designed for specific applications. This technique could facilitate new semiconductor devices with better functionality than conventional thin-film devices.
Researchers at Stanford have created a novel nanowire welding technique using plasmonics that enables precise heating without damaging the wires. This breakthrough allows for the production of stronger, more efficient meshes for various electronic devices and solar applications.
Researchers created an organic LED light with a warm white color near point A and high color stability by adjusting layer heights. The final OLED has improved performance compared to traditional incandescent bulbs.
Researchers from Penn State and Hallym University developed a system that uses LED lights to provide locational information, enabling shoppers to quickly find items in large stores. The hybrid system combines radio frequency transmitters with overhead LED lights to provide accurate location data.
Researchers from Kansas State University have found that LED lights can prolong the shelf life of certain beef products, making them more appealing to customers. This cost-saving solution could result in significant revenue for retailers and tax gains for the state.
Researchers at Helmholtz-Zentrum Dresden-Rossendorf have measured the lifetime of electrons in graphene in lower energy ranges. The study reveals that the energy of light particles and atomic lattice oscillations influence electron lifetimes, with longer lifetimes observed when excitation energies are lower than lattice oscillations.
Raising seedlings with blue light increases crop yield and quality by boosting phenolic compounds. Studies found that blue light-treated seedlings had higher leaf areas, shoot fresh weight, and antioxidant activity compared to those grown under red or white fluorescent light.
Researchers at Stanford University have created a single-mode light-emitting diode (LED) that is thousands of times more energy efficient than laser-based systems. The device can transmit data at 10 billion bits per second and operates at room temperature, making it a major step forward for on-chip computer data transmission.
University of Toronto researchers identify a new class of compounds with phthalimido molecular fragments, exhibiting unique electro-chemical properties. These compounds have the potential to execute all three tasks needed for a functional organic solar cell, including absorbing light, moving electrons and transporting holes.
Researchers have created thin, flexible sheets of organic light-emitting diodes (OLEDs) using a low-cost 'roll-to-roll' printing process. This technology could revolutionize lighting by being used for everything from home and office tiles to windows that simulate sunrise and sunset.
University of Toronto researchers develop high-efficiency OLEDs on plastic, a less costly alternative to traditional glass-based manufacturing, enabling flexible form factors.
Researchers used zinc oxide microwires to enhance the efficiency of LEDs by creating a piezoelectric potential that tunes charge transport and carrier injection. The devices showed significant improvement in emission intensity and injection current.
A recent study conducted by Sandia National Laboratories found that diode lasers can produce high-quality white light comparable to LEDs, which may lead to new lighting technologies. The research used a test involving volunteers and different lighting sources, including LED bulbs, incandescent lights, and diode laser combinations.
Researchers are developing cutting-edge solutions for renewable energy and environmental research, including thousands of sensors to monitor climate change, novel LED designs that boost efficiency, and thinner solar cells. These innovations aim to make space safer by tracking space debris and improve energy sustainability.
A KAIST research team developed a biocompatible, flexible GaN LED that can detect prostate cancer, opening the door for implantable biomedical applications. The technology utilizes a highly efficient and flexible light-emitting device to diagnose diseases, potentially revolutionizing medical treatments.
A new international study reveals that 'white' light bulbs emit shorter wavelengths that suppress melatonin production, causing behavior disruptions and health problems. The researchers recommend limiting the use of 'white' light, adjusting lampposts to reduce light pollution, and using energy-efficient lighting.
Researchers at the University of Florida have developed a novel manufacturing process for quantum dot-based LEDs, reducing production costs and improving efficiency. The breakthrough enables the large-scale commercialization of these energy-efficient lights, potentially replacing traditional incandescent and fluorescent bulbs.
Researchers designed a new type of optical waveguide that isolates light signals on a silicon chip, solving a long-standing problem in engineering photonic chips. This breakthrough enables the creation of integrated nanoscale photonic devices and components for future integrated information systems.
The US phase-out of 100-watt bulbs is driving growth for light-emitting diodes (LEDs) which have become ubiquitous in everyday life. LEDs now replace fluorescent lights as backlights in cell phones and laptops, and are poised to become an alternative to incandescents and fluorescents in home lighting.
Physicists at the University of Pennsylvania have demonstrated a dramatic increase in the combined on time of semiconductor nanorods when clustered together, providing new insight into this mysterious blinking behavior.
Researchers have created a smaller, flexible LED light with improved thermal management and increased life-span. The device uses novel manufacturing techniques to reduce temperature and increase efficiency, making it suitable for various applications such as deformable display monitors and biomedical devices.
Green UV sterilization uses LEDs to safely disinfect food and water without mercury. MEGa-rays enable precise detection of nuclear threats by penetrating through lead and thick containers. Researchers also develop a full 3D invisibility cloak in visible light.
Researchers at Rensselaer Polytechnic Institute have developed a new method for manufacturing green-colored LEDs with significantly enhanced light extraction, internal efficiency, and light output. This breakthrough brings the team closer to their goal of developing high-performance, low-cost green LEDs.
UC Santa Barbara researchers identify Auger recombination as the mechanism behind LED droop, a drop in efficiency when operating at high powers. They propose using thicker quantum wells or growing devices along non-polar directions to minimize this loss mechanism.
Researchers at Berkeley Lab have demonstrated localized surface plasmon resonances in doped semiconductor quantum dots, opening up possibilities for plasmonic sensing and manipulation of solid-state processes. This discovery extends the range of candidate materials for plasmonics to include semiconductors, offering advantages such as d...
Researchers at the University of Toronto have developed a new method to improve OLED efficiency by using a one-atom thick layer of chlorine. This innovation enables record efficiencies of up to 50% at high brightness levels, making it a promising technology for future flat-panel displays and lighting applications.
Hybrid spintronic computer chips are being developed using a combination of inorganic and organic materials. The new technology could lead to computers that require less power and produce less heat, enabling instant on and flexibility. This breakthrough promises significant advances in information processing.
Researchers have developed a new drug delivery device that uses optical fibers to target specific areas of the body, reducing toxicity and side effects. The device is designed to deliver high-powered photosensitive chemicals directly to tumors or infected areas, potentially killing cancer cells and bacteria.
A new study found that daily application of light therapy via LEDs on the forehead and scalp improved cognitive function in patients with traumatic brain injury. The treatment led to substantial improvements in memory, inhibition, and attention, enabling one patient to return to full-time work.
Researchers at UC Irvine found that low-intensity red LEDs contained up to eight times the allowed amount of lead, while high-intensity bulbs had more contaminants. White bulbs had the least lead but high amounts of nickel, highlighting the need for safer alternatives and stricter testing regulations.
Researchers at UC Berkeley have developed a method to grow nanolasers directly onto a silicon surface, enabling highly efficient silicon photonics. This breakthrough could lead to powerful biochemical sensors and faster microprocessors, as well as new applications in computing, communications, displays, and optical signal processing.
Researchers at North Carolina State University have developed a new technique to reduce defects in gallium nitride (GaN) films used in LED lighting, increasing efficiency by a factor of two. The technique involves embedding voids in the film, which traps defects and prevents them from traveling through the material.
A low-cost spectrometer built with a cell phone can help high school students grasp chemistry concepts. By analyzing light spectra, students learn about material properties and critical thinking skills.