Articles tagged with Light Emitting Diodes
Researchers have developed a temporary tattoo using organic light-emitting diodes (OLEDs) that can emit green light. The technology has the potential to be combined with other electronics for various applications, including fashion, sports, and healthcare, such as detecting dehydration or signaling expiry dates.
Optical systems can combine light by multiplying wave functions instead of adding them, allowing for the solution of nonlinear problems. The authors suggest guiding system trajectories towards solutions by temporarily changing coupling strengths.
Researchers at UCLA have discovered a new molecular component in perovskites that can enhance their electronic performance. The study, published in Science, shows that properly designed organic molecules can contribute to the materials' electronic properties, leading to improved efficiency in solar cells and LEDs.
Isamu Akasaki, Shuji Nakamura, Nick Holonyak Jr, M. George Craford, and Russell Dupuis receive the prestigious award for their groundbreaking work in LED lighting technology. The prize acknowledges the significant reduction of energy consumption and carbon dioxide emissions through sustainable solid-state lighting.
Researchers at NC State University developed a new approach to design photonic devices, controlling light direction and polarization from thin-film LEDs. This technology paves the way for lighter, more efficient VR and AR headsets with improved efficiency and clearer views of the real world.
Scientists have developed novel, non-toxic organic emitters for the near-infrared range, achieving high external quantum efficiencies in OLEDs. The new materials surpass previous reports by demonstrating improved radiative rates and reduced aggregation quenching.
Researchers developed a microelectromechanical systems (MEMS) optical scanner that enables better road safety by adjusting the driver's visibility based on speed and traffic environment. The system provides improved visibility, especially for pedestrians, and reduces glare from oncoming vehicles.
Researchers from Far Eastern Federal University and international partners developed ceramic phosphors that can be applied in-ground and aerospace technologies. The new materials produce compact energy-efficient white light-emitting diodes (wLEDs) and high-power systems, with reduced operating temperatures.
Researchers at Seoul National University and University of Pennsylvania developed highly efficient perovskite light-emitting diodes (PeLEDs) with an external quantum efficiency of 23.4%, surpassing previous records in PeLEDs and InP-based green emitting QD-LEDs.
Scientists created a method for calculating optimal parameters of liquid crystal displays (LCDs) to enhance viewing angles without compromising image quality. The new technology uses diffraction optical elements with specific surface microreliefs to expand the angle of view, allowing for better color rendition and high resolution.
Researchers at Linköping University have developed efficient blue light-emitting diodes based on mixed halide perovskites, achieving stable emission in the deep blue to sky blue range. The new LEDs are made using the vapour-assisted crystallisation technique and exhibit an energy efficiency of up to 11%.
Researchers developed fish-inspired robots that synchronize movements in 3D space, exhibiting complex collective behaviors such as aggregation and circle formation. The system uses blue LED lights for vision-based coordination and demonstrates autonomy in underwater environments.
The new approach uses dynamic LED lighting to create 3D images without requiring complex synchronization. The researchers achieved a reconstruction error of just 2.6 millimeters using a smartphone and commercially available LEDs.
An international team from Osaka University has reported a novel hybrid emitter that could revolutionize OLED display design. The SiAz material achieved an external quantum efficiency of 4%, making it the best-performing heavy-atom-free OLED to date.
Using a new combination of emitter molecules, researchers achieved devices that produce pure-blue emission with high efficiency, maintain brightness for relatively long times, and lack expensive metal atoms. The approach uses a tandem structure to effectively double the emission, leading to nearly doubled lifetime at high brightness.
A KAUST team has created a way to produce warm and cool white light LEDs by combining devices of different materials, eliminating the need for phosphors. The new device uses material defects to enhance current injection, emitting light across the entire visible spectrum.
Researchers at MIT have developed a silicon chip with fully integrated LEDs, enabling state-of-the-art sensor and communication technologies. The advance could lead to cheaper manufacturing, improved performance, and increased efficiency in nanoscale electronics.
Researchers at Polytechnique Montréal have created a new fluorescent organic light-emitting diode (OLED) that is 300% more efficient than existing OLEDs in its category, reaching a quantum efficiency of 3.8%. The breakthrough could enable the use of infrared OLEDs in smartphones and other devices.
The study confirms the accuracy of ODPL measurements and reveals the possibility of measuring optical absorption in crystals using this method. Researchers found that the origin of the two-peak structure in ODPL spectra is due to the Urbach-Martienssen absorption tail observed in many semiconductor crystals.
Researchers at POSTECH developed thin-film organic photodiodes with accurate and simple junction engineering, controlling spectral response of wavelengths. This innovation enables the production of color-filter-free optical sensors, a significant advancement in replacing silicon photodiodes.
Researchers developed a new spectroscopy method, 'omnidirectional photoluminescence (ODPL) spectroscopy,' to test materials for electric cars and solar cells. The technique can detect defects and impurities at low temperatures.
Researchers have developed a new cerium(III) complex that achieves 100% EUE in OLEDs, leading to improved device stability and efficiency. The device shows a maximum external quantum efficiency of 20.8%, smaller roll-off, higher maximum luminance, and longer operating lifetime compared to traditional iridium-based OLEDs.
Researchers at Skoltech have created DroneLight, an interface that enables users to direct drones to create light-painting patterns through hand gestures. The system uses machine learning algorithms and inertial measurement units to track user movements, allowing for intuitive drone control without special training or equipment.
Researchers have developed a novel cerium(III) complex that enables the creation of high-efficiency, deep-blue organic light-emitting diodes. The complex exhibits a high photoluminescence quantum yield and leads to an external quantum efficiency of up to 14% in prototype OLEDs.
Researchers developed an optoelectronic implant that stimulates sensory neurons with light, inducing mild inflammation in animals. This study shows a neuroimmune interaction between pain and inflammation, offering new insights into future treatments.
Researchers at Tokyo Institute of Technology have developed a highly efficient blue-emitting semiconductor material Cs5Cu3Cl6I2, which can produce white light while reducing energy consumption. The new material has unique properties that make it more stable and eco-friendly than existing alternatives.
Researchers developed a prediction method for reverse intersystem crossing (RISC) in organic semiconductors, leading to improved light emission efficiency for Organic Light-Emitting Diodes (OLEDs). The method demonstrated accurate predictions for various TADF materials, with some presenting RISC rate constants of over 10^7 per second.
Researchers developed a method to create flexible micro LEDs that can be detached from their substrate and attached to various surfaces. This technology aims to enable bendable, wearable electronics with high resolution.
A new design for light-emitting diodes (LEDs) developed by NIST scientists achieves a significant increase in brightness and the ability to create laser light, overcoming a long-standing limitation in LED efficiency. The device shows an increase of 100 to 1,000 times in brightness over conventional tiny LEDs.
North Carolina State University researchers have developed a novel ultrasonic imaging device that can optically display an acoustic signal on the surface of a piezoelectric transducer. This approach eliminates electrical signal processing altogether, resulting in reduced costs and increased efficiency. The technology has the potential ...
Researchers at Washington University in St. Louis have developed a method to convert red bricks into energy storage units that can store electricity, which could be charged and used to power devices. The 'smart bricks' can store a substantial amount of energy and can be recharged hundreds of thousands of times within an hour.
Researchers at Tohoku University developed faster LED-based optical wireless technology using deep ultraviolet light, overcoming solar interference issues in traditional Li-Fi systems. The new LEDs enable quicker communication speeds and are suitable for use in 5G wireless networks.
A team of scientists introduces a 'meta-grid' of nanoparticles that significantly enhances the light output of LEDs while reducing energy consumption. By reducing Fresnel reflection loss, the 'meta-grid' increases the lifetime of LED chips by eliminating unwanted heat.
Scientists have developed a wireless, optical cochlear implant that uses LED lights to restore hearing in deaf rats and gerbils. The device generates more selective signals than prior designs, offering improvements over current electrode-based implants.
Researchers at Newcastle University have developed a new type of organic LED that enables faster data transfer speeds, reaching 2.2 Mb/s. This breakthrough could enable the integration of portable and wearable organic biosensors into visible light communication links.
Researchers analyzed display technologies, including Mini-LED, Micro-LED, and OLED. They found that mLED/μLED/OLED emissive displays outperform LCDs in dynamic range, motion picture response time, color gamut, and adaptability to flexible and transparent displays.
Scientists have successfully fabricated red LEDs using indium gallium nitride, a material that can emit green, yellow, and red light. The developed LEDs offer improved stability at high temperatures compared to current InGaP-based devices.
Scientists at HZB have successfully produced functional light-emitting diodes using a metal halide perovskite material. The new printing process enables the creation of printed LEDs with significantly better optical and electronic characteristics compared to traditional additive manufacturing processes.
Researchers at ITMO University have created glass-ceramic lamps that produce a wider spectrum of light, including infrared, to improve plant growth in greenhouses. The lamps use chrome and glass-ceramics to emit both red and IR light, offering new possibilities for agricultural facilities.
Researchers at UC Santa Barbara developed a new approach to design LEDs that can extract and direct photons with high efficiency. By using metasurface concepts, they were able to confine electrons and holes in gallium nitride nanorods, allowing more light to escape the semiconductor structure.
A team of researchers at Penn State has developed a handheld ultraviolet light device that can effectively disinfect areas by killing the novel coronavirus. The device uses high-performance UV LEDs emitting a high intensity of UV light, which is currently limited by transparent electrode materials.
Researchers have developed UVC LEDs emitting at 230nm that can destroy microorganisms without allowing resistances to develop. The system achieves high irradiation power and uniformity, making it suitable for killing MDR pathogens and inactivating coronaviruses.
Researchers developed a novel two-dimensional titanium carbide MXene film serving as an efficient flexible electrode for light-emitting diodes. The MXene-based LEDs exhibit high efficiency and flexibility, surpassing conventional indium tin oxide-based devices.
Scientists from University of Groningen have found that defects in perovskite materials cause broad-spectrum emissions and large colour variation, contradicting previous theory. This discovery has profound consequences for designing perovskite LEDs capable of broad-range light emission.
A team of electrical engineers at KAUST has successfully made pure red LEDs from nitride crystals, paving the way for improved display technologies and efficient lighting. The breakthrough utilizes metalorganic vapor-phase deposition to add indium and aluminum to the crystal, reducing defects and increasing voltage efficiency.
A yellowish solid compound has been found to emit an intense green glow when excited by an electric current, making it a hot candidate for producing OLEDs. The substance's chemical structure allows for high light yields due to its stiff molecule and minimal changes in structure upon excitation.
The team's microsensors can measure inputs like voltage and temperature in hard-to-reach environments, such as inside living tissue. They successfully embedded a sensor in brain tissue and wirelessly relayed the results, paving the way for generations of microsensors that use less power while tracking more complicated phenomena.
Researchers at University of California - Santa Barbara develop ultraviolet LEDs that can decontaminate surfaces, floors, and HVAC systems. The technology has the potential to sanitize personal protective equipment, medical settings, and public spaces without causing burns or eye damage.
A new photosensitizer compound created by West Virginia University researchers has the potential to significantly improve the efficiency of solar panels and other technologies. The compound, made from zirconium, can convert light into electrical energy, making it a more sustainable and cost-effective option for renewable energy.
Researchers at Linköping University have developed a tiny unit that can both transmit and receive optical signals using perovskite diodes. This innovation has the potential to simplify and shrink optoelectronic systems, particularly in applications requiring low weight, flexibility, or large surfaces.
Scientists have created a stable perovskite LED with an efficiency of 17.3%, significantly surpassing previous results. The breakthrough composite thin film, made by embedding a perovskite into an organic molecule matrix, has enabled the development of long-lasting LEDs.
Scientists at ITMO University have developed a new method to increase the efficiency of solar cells and light-emitting diodes by augmenting their auxiliary layers with carbon dots. This approach has led to significant improvements in efficiency, with increases of up to 13% for perovskite-based solar cells.
Scientists developed a new method to increase PL quantum yield of perovskites from 2.5% to 71.54% by adding water, maintaining luminescence in various solvents and exhibiting excellent ambient and thermal stability.
Researchers from UNSW Sydney have successfully analyzed the complex structure of benzene in 126 dimensions, shedding light on its stability and interactions. The discovery reveals unexpected electron behavior, where up-spin double-bonded electrons interact with down-spin single-bonded electrons.
Researchers at KAIST have created stretchable OLEDs with a unique stress-relief substrate design featuring pillar arrays that reduce stress on active areas under strain. This technology enables 2D stretchability, overcoming commercial limitations of traditional OLEDs.
Researchers at Columbia Engineering have introduced a new robotic finger with a highly precise sense of touch over complex, multicurved surfaces. The finger uses overlapping light signals to detect contact and can localize touch with very high precision, making it suitable for dexterous hands.
Researchers are developing bacterial proteins to create new, artificial fluorescent compounds. The goal is to produce biodegradable and sustainable light-emitting diodes (LEDs) using these novel compounds. By harnessing the power of bacteria, scientists hope to create more eco-friendly lighting solutions with minimal environmental impact.
A team of European scientists developed a micro-particle size analyser using AI and consumer electronics. The device measures particle size with precision comparable to commercial light-based analysers, but is much smaller, lighter, and cheaper.
The researchers create a device that uses surface acoustic waves and industry-compatible fabrication processes to transport individual electrons one by one, recombining them with holes to produce single photons.
UVphotonics presents novel UV LED developments with customizable wavelengths and compact size ideal for water purification, disinfection, medical diagnostics, and more. The company's product portfolio has been expanded to include integrated driver circuits and fully packaged UVC LEDs.