Articles tagged with Light Emitting Diodes
Perovskite LEDs have achieved close to 100% internal luminescence efficiency, opening up applications in displays, lighting, and communications. The devices outperform conventional OLEDs in terms of light-emission efficiency due to a composite layer of perovskites with an insulating polymer.
Researchers developed a machine learning algorithm to predict properties of compounds for efficient phosphors in LEDs. The algorithm reduced the search time from weeks to just 30 seconds, identifying sodium-barium-borate as a promising material with 95% efficiency and outstanding thermal stability.
A Florida State University research team has developed a unique organic-inorganic compound containing zero-dimensional molecular clusters that emit highly efficient blue light. The newly discovered material has an efficiency of over 80%, making it a promising candidate for photon-related technologies.
Scientists developed a bioadhesive, wirelessly-powered implant emitting light to kill cancer cells, promising effective treatment for internal organ cancers. The device overcomes limitations of conventional photodynamic therapy by providing continuous, local light delivery.
Researchers used a boron nitride separation layer to grow InGaN solar cells, which were then lifted off their substrate and placed onto glass for improved light absorption. The new technique could boost solar cell efficiency up to 30 percent.
Researchers at MIT have developed soft hardware that can be worn, integrating high-speed optoelectronic semiconductor devices into fibers woven into washable fabrics. This breakthrough could lead to a new 'Moore's Law' in fibers, enabling rapid growth in capabilities.
Researchers at NIST demonstrate a new method for visualizing objects engulfed by large gas fires using ordinary blue light. This technique improves the accuracy of material testing by reducing image distortion and enhancing signal clarity. The study has potential applications in fire-resistance standards testing and could lead to more ...
Researchers have developed a quantum random number generator using a millimeter-scale chip that measures phase fluctuations from a laser diode, generating high-speed random numbers with low power consumption. The device enables real-time encryption and secure data transmission, overcoming vulnerabilities of existing algorithms.
Researchers have developed nanomaterial-based white LEDs with a record luminous efficiency of 105 lumens per watt, promising a promising energy-efficient lighting source for homes and offices. The new LEDs use commercially available blue LEDs combined with flexible lenses filled with quantum dots to create white light.
International researchers found that illuminating gillnets with green LED lights reduced guanay cormorant deaths by 85%. This technology also reduced sea turtle catches by 64%, offering a cheap and effective way to reduce bird and turtle mortality in fishing.
Researchers at Kyushu University have demonstrated a way to split energy in OLEDs, surpassing the 100% limit for exciton production. This new technology uses singlet fission to convert electrical charges into light with high-intensity near-infrared emission.
A KAIST research team developed a low-cost production technology for thin-film blue flexible vertical micro LEDs, achieving three times higher optical power density and longer device lifetime than lateral micro LEDs. This innovation enables the widespread adoption of micro LEDs in mobile and TV displays.
A new study finds that blues and whites are worst for wildlife, while yellow, amber, and green are more benign. The research provides a method for developers and policymakers to choose wildlife-friendly lighting colors.
Researchers at MIT have devised a new method for enhancing the interaction between light and matter, which could lead to more efficient solar cells that collect a wider range of light wavelengths. By slowing down light and controlling its frequency, they can also create tunable color LEDs with fully tunable emissions.
Researchers from Universitat Autonoma de Barcelona and Technische Universität Dresden demonstrate the use of ultrastable film formation to improve OLED performance. This breakthrough leads to significant increases in efficiency and operational stability, with improvements tracked back to differences in exciton dynamics.
Researchers develop a method to prepare aggregated, highly luminescent nanostructures from copper-iodine cluster molecules. These nanoaggregates can be used as luminescent inks for invisible paintings and color coatings for LEDs, emitting light in various colors.
Ultrastable glass layers significantly increase OLED efficiency and stability by up to 15%. This breakthrough allows for better competition in markets like automotive lighting and head-mounted displays. The research was carried out jointly by Universitat Autònoma de Barcelona and Technische Universität Dresden.
Researchers developed a novel electron-transport material by appending triphenyltriazine to 1,10-phenanthroline. The compound showed improved electron mobility and stability in green phosphorescent OLEDs, with high efficiency and minimal decay over time.
Researchers used scanning photocurrent microscopy to study atomically thin nanomaterials exposed to light, revealing the processes affecting electrical current generation. The study suggests that charge transfer is beneficial for photodetection while energy transfer is preferred for photovoltaic applications.
KAUST researchers create triboelectric nanogenerators that capture mechanical energy from human movements and convert it into electricity. They also engineer a wearable self-powered bracelet that can store converted energy for operating electronic devices.
Researchers discover silicon carbide as a promising material for single-photon emission, enabling high-speed quantum internet. This breakthrough could guarantee unconditionally secure data communication lines forever.
Scientists create atomically-thin fabrics by stitching different crystals together in a single session, resulting in the most perfectly aligned materials ever grown. This breakthrough opens up new possibilities for electronics, including flexible LEDs and strain-sensing fabrics.
A team of scientists from Cornell University and the University of Chicago has successfully created atomically thin fabrics by stitching different materials together. The resulting single-layer materials exhibit perfectly aligned crystals with minimal defects, opening up possibilities for flexible LEDs and new electronic devices.
Researchers developed LEDs made of dislocation-free aluminum-gallium-nitride nanowires, which can efficiently extract light due to air gaps between nanowires via scattering. Treating the nanowires with a diluted potassium-hydroxide solution suppresses surface reabsorption, leading to a 49.7% enhancement in ultraviolet light output power.
A recent study by GFZ scientists found that German night lights increased in brightness, except for Thuringia, which showed a decrease. The reason behind this trend is still unknown, but researchers suspect it may be related to the transition from older lighting technologies to LED lamps.
A team of engineers at UC San Diego used data mining and computational tools to discover a new phosphor material that is inexpensive, easy to make, and produces high-quality white LEDs. The new material, dubbed SLAO, has better color quality than many commercial LEDs and can be manufactured using industrial methods.
Researchers designed an LED-based train headlight that reduces energy consumption and emits less CO2. The new design uses precisely positioned high-efficiency LEDs to create a bright beam while minimizing electricity use.
Researchers from Martin Luther University Halle-Wittenberg have developed a cost-effective method to break down pollutants in water, using a green LED light, catalyst, and vitamin C. The new process produces hydrated electrons that can react with stable substances and break them down into harmless components.
Researchers have created a new surface design featuring rigid scales assembled into soft, ferromagnetic micropillars on a flexible substrate. The nanostructured silicon scales enable fluid and light manipulation, with tunable wetting, droplet manipulation, and structural coloration demonstrated.
Researchers at Naval Research Laboratory have discovered a new material that emits light much faster than conventional materials, enabling larger power, lower energy use, and faster switching for communication and sensors. The discovery could lead to 20 times more intense LEDs and lasers.
Researchers at KAUST have developed corrugated arrays of interdigitated back contact solar cells with screen-printed aluminum contacts that can bend without cracking. The cells have a record-breaking efficiency for both silicon solar cell efficiency and bendability.
A team of scientists from the National University of Singapore has developed a way to wirelessly deliver light into deep regions of the body to activate light-sensitive drugs for photodynamic therapy (PDT). The technology enables PDT to be used on inner organs with fine control, potentially treating a wider range of cancers.
Researchers discover mechanism responsible for limit on indium content in InGaN thin films, affecting blue light emitting diodes. A regular pattern of atoms within the monolayer limits indium concentration to 25-30%.
KAIST researchers designed metallic nanostructure substrates to enhance Quantum Dot LED efficiency and reduce production costs. The technology uses silver and aluminum nanoparticles to increase fluorescent properties of QDs, resulting in brighter displays and lower unit prices.
The researchers have designed non-planar vertical semiconductor fin-like structures that are laterally interconnected to form wavy transistor arrays. This design widens the transistors by 70% without expanding their occupied pixel area, doubling the transistor performance.
Researchers discovered that caesium lead halide nanocrystals emit light at room temperature after just one nanosecond, making them faster and brighter than other quantum dots. This is due to their unique excited energy state, which allows for immediate light emission, unlike traditional quantum dots that rely on a dark state.
Researchers at KAIST developed fiber OLEDs that surpass existing plansar substrates in terms of luminance and current efficiency values. The new technology also allows for the fabrication of OLEDs on ultra-thin fibers, with diameters as low as 90?, enabling the creation of wearable displays.
Researchers at Duke University have developed a method to create hybrid thin-film materials that can absorb and emit light efficiently. The technique, called Resonant Infrared Matrix-Assisted Pulsed Laser Evaporation, allows for the creation of delicate organic-inorganic crystals with improved scalability and durability.
Researchers at KAUST have demonstrated rapid data transfer using ultraviolet-B light, overcoming interference issues with visible light and improving beam alignment challenges. The system achieved a record-breaking transmission rate of 71 megabits per second.
Researchers found that boron incorporation in InGaN material reduces electron collisions, increasing LED efficiency. The boron-based BInGaN material can be grown on top of GaN using existing techniques, making it suitable for high-power and efficient visible LEDs.
Researchers develop new method to dope organic semiconductors with n-type donor molecules using a two-step process involving the use of light. This approach enables significant increases in conductivity, making it suitable for applications such as light-emitting diodes and solar cells.
A recent international study suggests that LED lighting upgrades could lead to increased light pollution, as individuals and cities switch to brighter lamps. The 'rebound effect' might cancel out initial energy savings, causing global night-time surface brightness to increase by 2% annually.
Scientists have successfully created the first continuous-wave lasing in an organic-inorganic lead halide perovskite semiconductor, which could be a crucial step towards developing electrically driven devices. By adjusting the material's temperature, they avoided a phenomenon known as lasing death and achieved over an hour of lasing.
Researchers at Los Alamos National Laboratory have successfully amplified light using electrically excited films of quantum dots. The team developed a novel approach to eliminate heat loss and achieve optical gain, paving the way for highly flexible, electrically pumped lasers that can complement or displace existing laser diodes.
Researchers at Ohio State University describe a new semiconductor LED made with GaN-based materials that could enhance LED solid state lighting without significant changes to manufacturing facilities. The breakthrough uses quantum-mechanical tunneling to create 'holes' for radiative recombination, reducing energy losses and self-heating.
Researchers at Princeton University have developed a new approach to increase the conductivity of organic semiconductors, which could lead to more widespread use of organic electronics. The breakthrough involves using a ruthenium-containing compound that adds electrons to the semiconductor, increasing its conductivity by about a millio...
A new study suggests that replacing incandescent bulbs with CFLs or LEDs is a good option, especially for reducing power-plant emissions. However, delaying adoption may be more cost-effective for consumers who want to minimize their energy bills and reduce home energy use.
Researchers at Aalto University have successfully doped gallium nitride with beryllium, showing promise for reducing energy losses in power electronics. The findings suggest that the material can be controlled to achieve significant improvements in energy efficiency, potentially cutting global power consumption by up to ten percent.
Researchers have developed a light emitter and detector that can be integrated into silicon CMOS chips, overcoming the interconnect bottleneck. The device uses an ultrathin semiconductor material called molybdenum ditelluride, which emits light in the infrared range, not absorbed by silicon.
Researchers at Kyushu University have successfully demonstrated persistent luminescence from organic materials, achieving long-lived emission lasting over an hour. This breakthrough has the potential to revolutionize various fields, including bio-imaging and safety applications.
Scientists at MIT and their collaborators have developed a new approach to ultrafast light pulses by coupling molecular aggregates with thin layers of metals like silver. This enhancement increases the material's response time tenfold, making it suitable for applications in photonic chips and signal processing.
Scientists have made a breakthrough in producing ultra-pure green light for high-resolution displays, exceeding 97-99% of the Rec.2020 standard. The new technology uses simple room-temperature processes and inexpensive materials, paving the way for low-cost industrial production.
Researchers at KAIST have created highly flexible wearable displays by integrating OLED into fabrics, enabling commercialization of clothing-shaped displays. The team's breakthrough technology reduces mechanical stress on OLEDs, resulting in high luminance and efficiency.
Researchers at OIST have improved the stability of perovskite solar cells by inserting a thin polymer layer, extending their lifespan four-fold. They have also developed a new method to manufacture perovskite LEDs using chemical vapor deposition, which could lead to lower-cost and more efficient lighting solutions.
Ludwig-Maximilians-Universität München researchers have developed a method for producing semi-conducting nanocrystals with controlled size, enabling the creation of color-tuned LEDs. The new method uses perovskite-based nanocrystals and allows for high color fidelity and industrial-scale production.
A new technology using photoswitch molecules allows for the creation of 3D light structures viewable from 360 degrees, with potential applications in biomedical imaging, education, engineering, and entertainment. This discovery could also improve medical diagnosis by providing real 3D images from MRI scans.
Ames Laboratory scientists are developing low-dimensional nanomaterials to enhance the performance of solar cells, TV displays, and computer technology. The goal is to broaden the science of these materials and explore their properties.
Researchers introduce a new bottom-up approach to pattern emissive polymers, enabling efficient creation of multi-colored OLED arrays. The method uses designer iridium photocatalysts and could potentially enable high-throughput manufacturing of OLEDs using various technologies.
Researchers fabricated and tested Ag/ZnO-Nanorods Schottky diodes for UV detection, achieving cost-effective and low-voltage applications. The devices demonstrated good sensitivity and rapid response times.
Optical isolators are crucial for signal routing and protection in photonic circuits. Researchers demonstrated complete optical isolation within any dielectric waveguide using a simple approach without magnets or magnetic materials. The technique achieves ideal characteristics such as zero loss and perfect absorption, expanding on-chip...