Articles tagged with Light Emitting Diodes
Research reveals organic aggregates can emit polychromic and white light with high efficiency, opening up new avenues for OLEDs and encryption. However, more work is needed to fully understand the underlying mechanisms and improve performance.
Researchers at KAUST have developed a nanocomposite that absorbs X-rays with near-perfect efficiency and re-emits the energy as light. This innovation improves high-resolution medical imaging and security screening, with detection limits up to 142 times lower than traditional methods.
Researchers have developed a room-temperature perovskite polariton parametric oscillator, enabling scalable and low-threshold nonlinear devices. This breakthrough offers possibilities for the development of cost-effective and integrated polaritonic devices.
A KAUST-led team reviewed strategies for mitigating damage to transparent electrodes in optoelectronic components. The team identified buffer layers as a potential solution, with strengths and weaknesses of different materials and techniques for creating them.
Researchers found that three minutes of morning exposure to 670nm deep red light improved color contrast vision by 17% and the effects lasted for at least a week. The study built on previous findings that daily longwave deep red light exposure boosts energy-producing mitochondria cells in the retina.
Scientists designed a precursor compound with a single conjugated polymer chain and then formed a second rail through a zipper reaction to create a molecular ladder. The ladder has two tracks of conjugated polymers, allowing energy to move along the molecule in space.
Researchers have developed a new light-emitting material that doubles the intensity of existing LEDs while also being more energy-efficient. The material, cerium-doped zinc oxide, has the potential to be used in commercial LED lighting applications and could make lighting more affordable for households and businesses worldwide.
A lung model mimicking complex anatomy has enabled the assessment of respiratory volumes using a gas-in-scattering-media absorption spectroscopy (GASMAS) technique. The study demonstrates the feasibility of GASMAS to sense changes in gas volume in a controlled environment, paving the way for potential clinical applications.
Researchers at the University of Queensland have developed a method to produce unbreakable screens using liquid-phase sintering of lead halide perovskites and metal-organic framework glasses. This breakthrough could revolutionize the display industry with virtually indestructible displays.
Researchers have developed metal-halide perovskite semiconductors as a cheaper alternative to silicon for solar cells and LEDs. The new material class offers excellent functionality and can be processed from solution, allowing for the creation of efficient devices.
SMART researchers have discovered a practical method to overcome current challenges in the manufacture of indium gallium nitride (InGaN) LEDs with considerably higher indium concentration. The new approach uses intrinsic defects in semiconducting materials to form quantum dots that emit long-wavelength light.
Researchers at North Carolina State University have developed a new synthesis process that increases the number of holes in p-type III-nitride semiconductor materials, leading to more efficient LEDs and lasers. This breakthrough could also help address the long-lasting problem called the 'green gap' in LED technology.
Researchers at Washington University in St. Louis developed a new material for stretchy flexible LEDs using an inkjet printer, combining the benefits of organic and inorganic LEDs. The new material, called perovskite, can be printed onto unconventional substrates, including rubber, and is elastic and stretchable in nature.
A new instrument at the Advanced Light Source enables simultaneous measurement of crystal structure and optical properties during perovskite synthesis. This allows for real-time monitoring of material quality and performance, leading to potentially more efficient solar cells.
Researchers reviewed the progress of Single-Emissive Layer White Light Emitting Diodes (SEL-WLEDs), highlighting their advantages in low cost, simple process, and material stability. The study proposes perovskite materials as a feasible path to commercialization.
The new system, using over-current driven LED lights, improves image brightness and color consistency, reducing motion blur and variability caused by sunlight. The prototype showed an average decrease of 85% in standard deviation for hue-saturation-value channels compared to auto-exposure settings.
Colloidal quantum dot technology enables infrared lasing at room temperature, paving the way for low-cost solution-processed and CMOS integrated lasing sources. The breakthrough discovery may facilitate fully integrated silicon photonics, enabling lower power consumption, higher data rates, and multi-spectral 3D imaging capabilities.
Researchers at KAUST developed bright red indium gallium nitride microlight-emitting diodes that emit light across the entire visible-light spectrum. The devices have a high output power of 1.76 milliwatts per square millimeter, outperforming previous devices.
Researchers at the Institute for Basic Science have developed a foldable quantum dot LED that can be transformed into various complex 3D structures, such as butterflies and pyramids. The technology employs selective laser-etching to create precise curvature lines, allowing for stable light-emitting performance even after repeated folding.
Researchers have developed a revolutionary wireless photoelectric implant that can control the activity of spinal neurons, enabling the study of neural function and the development of new treatments for neurological disorders. The breakthrough technology uses pulses of light to stimulate or inhibit specific spinal-cord neurons, potenti...
A new study found that global light pollution has increased significantly over the past 25 years, with the true increase potentially being much higher. The study, led by the University of Exeter, reveals that the transition to solid-state LED technology has masked the impact of light pollution in many regions.
Researchers generate circularly polarized light at room temperature, a breakthrough for optical quantum information processing. The device uses strained semiconductors to produce twisting 'chiral' valley-polarized light, promising vast data storage capabilities.
Researchers have developed a stable perovskite nanocrystal material for LEDs, enabling bright and long-lasting light sources. The new material is made using a metal-organic framework structure, which keeps the nanocrystals separate and prevents degradation.
The new technology uses a 'tuneable' infrared LED that can detect multiple materials, including bacteria in meat and potentially lethal gases. It has the potential to improve safety for firefighters, miners, and military personnel, as well as be integrated into smartphones and other devices.
Researchers from University of Surrey and Cambridge have identified promising semiconducting materials for next-generation LED-based data communications. These organic semiconductors, colloidal quantum dots, and metal halide perovskites show potential for low-power and cost-effective solutions.
A new study found that LED streetlights have a detrimental impact on local insect populations, with moth caterpillar numbers being 52% lower under LED lighting than in unlit areas. The study suggests that this is due to female moths laying fewer eggs in habitats illuminated by streetlights.
Researchers developed a new memory device that uses perovskite to store and visually transmit data, achieving parallel and synchronous reading of data through electrical and optical methods. The device has the potential for numerous applications in next-generation technologies.
A study conducted at a Brazilian university found that treatment with curcumin and light reduces parasite load and eliminates Leishmania parasites completely. Curcumin showed good distribution in macrophages and reduced amastigotes' viability, changing their mitochondrial activity.
A new Science article assesses the technological progress of colloidal quantum dots, which have become industrial-grade materials for a range of technologies. Advances include first demonstration of colloidal quantum dot lasing, discovery of carrier multiplication and pioneering research into LEDs and luminescent solar concentrators.
Researchers at the University of Basel have developed new luminescent manganese complexes with promising properties, including improved efficiency and stability. These findings offer a potential solution for more sustainable energy production and could lead to the creation of water-soluble variants for medical applications.
Researchers from University of Tsukuba discovered that exposure to organic light-emitting diodes (OLEDs) before sleep reduces negative health effects on energy metabolism. OLEDs emit less blue light, leading to decreased energy expenditure and core body temperature during sleep.
The ETRI team developed the world's first next-generation display technology, combining transfer-bonding processes into one process. This innovation reduced equipment investment and process time to 1/10, as well as material and repair costs by 1/100.
Researchers use cross-correlation noise spectroscopy to identify crucial electrical noise signals in silicon solar cells, pinpointing physical processes causing energy loss and lower efficiency. The technique allows for precise measurement of noise and removal of detector noise, enabling the detection of smaller noise signals.
Researchers at Linköping University developed a method to create structural colours for use in reflective colour displays, enabling manufacturing of thin and lightweight displays with high energy-efficiency. The new method uses electrically conducting plastics and can produce all colours in the visible spectrum.
Researchers at Harvard John A. Paulson School of Engineering and Applied Sciences developed a single metasurface that can tune different properties of laser light, including wavelength, without additional optical components. This opens the door for lightweight and efficient optical systems for various applications.
A five-nanometer-thick layer of silver and copper outperforms conventional indium tin oxide in OLED displays, freeing up 20% more light. This innovation enables devices to maintain brightness while using less power, extending battery life and making displays more energy-efficient.
Researchers at KAUST developed a new molecular coating that significantly enhances the performance of organic photovoltaic cells, outperforming current materials like PEDOT:PSS. The coating increases efficiency by reducing electrical resistance, improving hole transport, and allowing more light to pass through.
Researchers at the University of Cambridge have developed a new technique that enables the creation of ultra-bright, flexible LEDs with improved efficiency and low cost. By swapping one out of every thousand atoms, they tripled the luminescence of halide perovskites, which could be useful for low-cost printable and flexible LED lighting.
Researchers develop new methodology to study lead halide perovskites' photophysics, revealing the limitations of existing theories. The method provides a complete representation of the material's photophysical processes, allowing for the examination of theory validity and exploration of new explanations.
A University of Houston research team creates a unique class of luminescent materials called phosphors that absorb violet LED's single-color emission and convert the light to cover the majority of the visible spectrum. The new LED bulb emits less blue light, reducing health concerns associated with overexposure.
Researchers from NUS and TU have developed a method to harness WiFi signals using spin-torque oscillators, converting them into energy to power small electronics. The device successfully harvested energy from WiFi-band signals to light up an LED wirelessly without using any battery.
Researchers have designed optical rectennas that can capture excess heat and turn it into usable electricity, achieving efficiencies 100 times higher than previous tools. The devices use a phenomenon called resonant tunneling to pass through solid matter without losing energy.
Researchers at King Abdullah University of Science & Technology (KAUST) have developed a more efficient red micro-LED, emitting light with high color purity and quantum efficiency. The breakthrough could lead to the creation of full-color displays using just a single semiconductor.
Researchers at UC Riverside are developing a new approach to convert light falling on atomically thin semiconductor materials into electricity. By twisting these materials, they aim to create new sensing capabilities for layered and stacked monolayer semiconductors.
Researchers developed a new type of LED that reduces blue light emission, resulting in a warm white light similar to natural sunlight. The new phosphor compound minimizes the intensity across blue wavelengths, improving sleep quality and reducing eye troubles.
Tandem micro-LEDs featuring stacked red, green, and blue micro-LEDs enable full-color displays. This method alleviates the issues of reduced LED size performance.
Researchers used advanced spectroscopy and electronic transport techniques to determine charge accumulation and dynamics in resonant-tunneling diodes. The study aims to develop novel RTDs with optimized charge distribution to enhance photodetection efficiency or minimize optical losses.
The study reveals indium atoms are randomly distributed in low-indium content InGaN and partially phase-separate in higher-indium content material. The findings advance understanding of atomic microstructure and its effect on LED performance, enabling future research to optimize compositional fluctuations.
Chinese scientists summarize the latest progress of CPL-active organic micro-/nano-structures, which can reduce energy loss in displays and photonic technologies. The review discusses design principles, external stimuli regulation, and potential applications, including OLEDs, optical information recording, and sensing technologies.
Quasi-2D perovskites offer self-assembled multi-quantum-well structures and large exciton binding energy, enabling high carrier density and efficient radiative recombination. Researchers are exploring composition and structure engineering to achieve pure red and blue LEDs with improved performance.
Researchers developed a non-invasive methodology using artificial intelligence to analyze crop seed quality. The technique uses light-based technology and machine learning to identify immature or poor-quality seeds, avoiding the need for destructive germination tests and providing more accurate results in less time.
Researchers found that using amber-colored filters on 'warm white' LED lamps reduces insect attraction to nocturnal lighting in a tropical forest. Insects play crucial roles as pollinators, regulators, decomposers, and food sources; using filtered LEDs can mitigate the negative impacts of ALAN on wildlife.
Researchers have created a highly efficient red-emitting phosphor using glass crystallization, overcoming the limitations of traditional LEDs. The new phosphor enables the production of high-power warm white lighting with excellent optical properties.
Researchers at NREL and University of Utah developed a spin-polarized LED using metal-halide perovskites, enabling room-temperature operation without magnets. This breakthrough has broad implications for applications like quantum computing and bioencoding.
Researchers have developed a semiconductor nanogroove enhanced millimeter and terahertz wave detector, achieving a noise equivalent power 2-3 orders superior to state-of-the-art detectors. The device operates at room temperature with fast response speed and broad spectral band detection.
Researchers at the University of Surrey have developed a new analysis of 2D perovskites, which could improve the stability of next-generation solar cells and LEDs. By combining lead with tin, they were able to reduce toxic lead quantities and tune key properties, leading to enhanced performance in photovoltaics and light-emitting diodes.
Researchers at City University of Hong Kong have created a new type of LED using 2D perovskite materials, which can be processed at room temperature and offer improved efficiency. The team discovered that adding a simple organic molecule enhances the electro-luminescence performance of the material.
Researchers have developed a microscopy technique that combines ultrafast electron manipulation with sub-nanometer photon detection. This allows for the investigation of quantum systems, sensing, and control, opening new doors for nanoscale science and technology.
Researchers successfully demonstrated electroluminescence from a silicon-germanium device, marking a key step towards the development of a silicon-based laser. The achievement could have significant implications for the large-scale use of terahertz radiation in fields such as medical imaging and wireless communication.
Researchers developed a first wearable sensor to continuously measure bilirubin, pulse rate, and blood oxygen saturation in real-time. The device aims to improve quality of phototherapy and patient outcomes in neonatal care.