Articles tagged with Light Emitting Diodes
A new framework predicts AIE behavior using quantum chemical calculations, identifying key structural factors that control excited-state dynamics. The framework enables rational design of luminescent AIE materials for applications like OLEDs, bioimaging, and sensors.
Researchers from Aarhus University developed a low-cost multispectral imaging system that uses LEDs at 16 different wavelengths to reveal differences in materials. The system was tested at Sorte Muld and Fredbjerg, revealing new layers and changes in the fill that were difficult to distinguish in normal color photographs. This technolo...
Researchers at Nagoya University developed a new way to lower the resistance of p-type GaN contacts by depositing an ultrathin magnesium layer and applying a brief heat treatment. This approach achieves a contact resistivity of (1–3) × 10⁻⁴ Ω cm², a significant improvement over existing methods. The new process has promise for accelera...
The research team developed a novel X-type quasi-two-dimensional perovskite emitter that enables thermodynamically controlled crystal growth and precise crystallization control in vacuum deposition. This enabled the creation of highly uniform, high-efficiency, and high-color purity PeLEDs.
A team of engineers developed a soft, shape-shifting mechanical surface that responds to touch, senses its movements, and visually communicates changes in real time. The platform combines magnetic actuation, embedded sensing, and LED-based visual feedback into a single programmable system.
A research team led by Prof. Yongtaek Hong developed a high-performance transparent organic light-emitting diode (OLED) incorporating highly conductive transparent metal mesh top electrodes fabricated using a selective metal deposition technique. The electrodes achieved high optical transparency of 93-99% and low sheet resistance, maki...
Researchers developed a new cavity control strategy to improve efficiency of blue VCSEL lasers, achieving 26.4% wall plug efficiency. The approach identified optimal mirror loss conditions and extracted device parameters, providing guidance for next-generation high-efficiency visible-light semiconductor lasers.
Researchers at Kyoto University developed a new organic molecule with an ultranarrow emission spectrum, achieving monochromatic light without strong excitation. The breakthrough opens up possibilities for OLEDs with extremely high color purity and advanced functionality.
Researchers optimize blue perovskite LEDs by introducing ordered dipolar PVDF, improving carrier transport and recombination. The breakthrough results in world-record device performance, exceeding 43.9 lm W−1 peak power efficiency.
A research team at Postech has developed a next-generation laser emission platform capable of precise color control under battery-level low voltage. The technology achieves ultra-high color purity and continuous spectral tunability within a single device, overcoming limitations of conventional display light sources.
The study demonstrates a significant improvement in red light emission from Eu-doped gallium nitride grown on a semipolar crystal plane. The approach selectively promotes the formation of highly efficient luminescent centers, resulting in brighter and more stable red LEDs for next-generation micro-LED displays.
Researchers at The University of Osaka developed a new LED structure that generates circularly polarized light from a single chip, reducing energy-conversion loss. This advancement could support smaller and more energy-efficient optical devices for next-generation technologies.
Researchers from The University of Osaka propose a compact LED design that directly emits circularly polarized light, potentially simplifying optical devices. The new design uses robust inorganic materials and achieves high levels of both efficiency and polarization degree.
Researchers at Stanford University have developed a promising approach to using well-studied semiconductors to improve infrared light-emitting diodes and sensors. The new technology has the potential to lead to smaller, sleeker, and less expensive infrared devices with improved defect tolerance.
Professor Tae-Woo Lee's research team has developed a 'Cold-injection' method to synthesize high-quality perovskite nanocrystals at room temperature, overcoming safety risks and production costs. The technology achieved near-unity photoluminescence quantum yield in a large-scale synthesis of 20 liters.
Researchers at Sandia National Laboratories have successfully employed artificial intelligence labmates to improve the control of LED lights, leading to a fourfold increase in steering efficiency. The AI platform uses a combination of machine learning and equation-learning techniques to optimize experiments and achieve new insights int...
Researchers developed a flexible OLED display that can be stretched to 1.6 times its original size while maintaining most of its luminescence. The technology uses MXene nanomaterial and an exciplex-assisted phosphorescent layer, improving the OLEDs' ability to efficiently produce light under strain.
Researchers at Meijo University have developed the world's first continuous-wave UV-B semiconductor laser diode operating at room temperature on a low-cost sapphire substrate. The achievement advances compact, energy-efficient UV light sources for various applications.
Researchers at Princeton University have developed a new technique to convert low-energy light into high-energy LEDs, improving the ability to upconvert green light to blue or ultraviolet light. The method uses plasmonics to boost upconversion on a thin metal film, reducing the power needed by 19 times compared to previous setups.
Researchers developed a bio-inspired neuron platform that processes and learns information using light and electronics integrated on a single platform. The chip achieves 92% image recognition accuracy and demonstrates key synaptic behaviors found in biological learning.
Researchers develop record-high circular polarization of 25.3% in GaN-based spin-LEDs using multi-periodic spin tunnel junction, enabling zero-field spin-LED performance. The design harnesses topological spin textures for controlling electrons and filtering, achieving a breakthrough in device operation.
Researchers at the University of Oxford have discovered an approach to electrically switch organic LEDs to emit either left- or right-handed circularly polarized light. This could lead to new applications in displays, secure communication systems, and quantum technologies.
Scientists at Institute of Science Tokyo developed an automatic and adaptive LED-based optical wireless power transmission system that can efficiently power multiple devices without interruption. The system overcomes limitations of traditional OWPT systems by adapting to varying lighting conditions and ensuring stable power delivery.
Researchers at Hosei University developed a hydroponic cultivation system using LED lighting to produce high-quality edamame consistently throughout the year. The nutrient film technique (NFT) method resulted in higher yields, better nutritional value, and increased productivity compared to traditional open-field cultivation.
A team of Korean researchers has successfully integrated a single memristor into micro-LED pixels, replacing the traditional driving transistor and storage capacitor. This innovation enables more efficient and easier-to-build displays with improved brightness and color accuracy.
Developed using alternating current power, single-contact nano-LEDs simplify fabrication and improve quantum efficiency for near-eye display applications. The technology has potential for smaller, more efficient devices with enhanced visual experiences.
Researchers developed a deep blue organic light-emitting diode (OLED) capable of producing sharp blue emission meeting BT.2020 standards with just a single 1.5 V battery. The device operates by introducing a new molecular dopant that prevents charge trapping, a problem that previously hampered the performance of low-voltage OLEDs.
Researchers at Universitat Jaume I develop cost-effective, high-performance chiral LEDs with enhanced optical properties. The RADIANT project aims to simplify display architectures and save energy consumption by leveraging scalable chiral metasurfaces.
A new spinel-type sulfide semiconductor, (Zn,Mg)Sc2S4, has been developed by researchers at Science Tokyo. The material can be chemically tuned to switch between n-type and p-type conduction, making it suitable for pn homojunction devices in next-generation LEDs and solar cells.
Researchers at Texas A&M University are working to overcome manufacturing hurdles for micro-LED displays, which use inorganic materials to create more robust and longer-lasting screens. The technology has potential for applications in virtual reality, augmented reality, and flexible displays.
Researchers develop an in-situ passivation strategy to overcome efficiency bottlenecks in thermally evaporated pure blue perovskite LEDs. The approach coordinates Pb(II) and suppresses halide-vacancy defects, achieving color-stable pure-blue emission with high luminance.
Researchers have developed a new macrocyclic [1,4]azaborine system that emits narrowband deep-blue light with a full width at half maximum of just 24 nm. The material achieves a peak external quantum efficiency of 23.3% in OLED devices.
Researchers developed a white organic light-emitting diode that operates at an unprecedentedly low voltage of less than 1.5 volts. This breakthrough could contribute to reducing energy consumption in state-of-the-art displays, including television backlights and lighting devices.
The review proposes a systematic AI-driven framework for OLED material design, offering theoretical guidance and practical pathways for intelligent materials development. Machine learning models are used to predict core optoelectronic properties, enabling rapid and accurate property prediction while providing structural insights that g...
Researchers have developed OLED-based systems that achieve data rates of up to 4.0 Gbps over 2 meters and 2.9 Gbps over 10 meters, surpassing previous records. The breakthrough uses a stable organic compound called dinaphthylperylene to balance brightness and speed.
Researchers have observed the luminescence of an excited complex formed by two donor molecules, opening possibilities for developing simpler, more efficient OLED devices. The discovery also enables the creation of sensitive sensors capable of detecting low concentrations of explosive substances.
A new prototype imaging system combines light-emitting diodes (LEDs) with hyperspectral imaging technology to create detailed maps of tissue properties invisible to conventional cameras. The system shows promise for cancer detection during endoscopy, achieving real-time speeds and high-quality data comparable to reference systems.
Researchers discovered the spin configuration of excited states in a typical zero-dimensional metal halide material, challenging traditional views on dual-peak emission. The study reveals that the low-energy peak includes both bright and dark states, while the high-energy peak is from a pure bright state.
Researchers investigated pulsed operation of perovskite LEDs to understand the role of mobile ions in maintaining stable light emission. They found a constant transient electroluminescence signal with higher intensity at higher duty cycles, which decreased with increasing duty cycle.
Researchers at Pohang University of Science and Technology developed a novel dry adhesive technology using shape memory polymers, allowing for precise micro-LED chip transfer with minimal residue. The technology offers significant advantages over conventional methods, including high adhesion strength and easy release.
A nanometer-thin spacer layer has been inserted into exciplex upconversion OLEDs (ExUC-OLEDs) to improve energy transfer, enhancing blue light emission by 77-fold. This design enables the use of previously incompatible materials, paving the way for lightweight, low-voltage, and more flexible OLEDs.
The team developed a tension-driven fluid drawing technique that enables the creation of freestanding, conductive architectures with miniaturization and mechanical resilience. The method achieved sub-10 μm resolution and demonstrated promising results in LED arrays, thermal sensors, and oscillating circuits.
Researchers at USTC have developed weakly space-confined all-inorganic perovskite light-emitting diodes (PeLEDs) with a luminous efficiency exceeding 22%. The new PeLEDs achieve a maximum brightness of over 1.16 million nits and can operate for more than 180,000 hours.
A new model details the kinetics of exciton dynamics in OLED materials, enhancing lifetime and accelerating material development. The findings have potential to improve fluorescence efficiency, leading to more advanced OLED devices.
The USTC team identified a novel material design that enables record-breaking device performance in pure-red PeLEDs. They introduced a 3D intragrain heterostructure to enhance carrier confinement capacity, suppressing hole leakage and achieving unprecedented efficiency and brightness.
Researchers developed bright and efficient green-emitting ZnSeTe-based QD-LEDs by introducing an ultrathin ZnSeS alloy interlayer, enhancing radiative recombination efficiency and optical stability. The devices showed a peak external quantum efficiency of 20.6% and luminance exceeding 100,000 cd m−2.
The POSTECH research team developed a smartphone-type OLED panel that can transform its shape while functioning as a speaker, maintaining ultra-thin flexibility. The panel uses electrically driven piezoelectric polymer actuators to achieve complex forms without mechanical hinges or motors.
Researchers have successfully achieved low-threshold anisotropic polychromatic emission from monodisperse quantum dots by coupling them with microcavities, overcame technical bottlenecks for practical applications. This enables broadband gain, amplification, and even lasing, as well as full-color display and patterning.
A new study introduces nanoPE, a nanomaterial that enhances thermal radiation emission from LEDs, reducing temperature and energy loss. This technology can significantly reduce carbon dioxide emissions in the US by over one million metric tons.
Researchers have developed a chiral semiconductor that emits circularly polarised light, potentially improving OLED display efficiency and enabling quantum computing. The innovation uses molecular design tricks inspired by nature to create ordered spiral columns of semiconducting molecules.
Perovskite LEDs have shown great potential for commercialization due to their lower costs and environmental impact. However, longevity remains a significant issue that needs to reach around 10,000 hours for a positive environmental impact.
Researchers at Curtin University have developed a new type of quantum dot that matches or outperforms traditional cadmium-based QLEDs in terms of efficiency and color accuracy. The breakthrough technology emits pure and vibrant blue light with an impressive 24.7% efficiency, lasting nearly 30,000 hours.
Researchers have developed a high-temperature successive ion layer adsorption and reaction (HT-SILAR) strategy for producing high-quality, large-particle alloyed red quantum dots. This enables the creation of highly efficient QLEDs with exceptional color purity and stability.
Researchers developed a theoretical model predicting substantial increase in OLED brightness by leveraging polaritons, promising improved efficiency and brightness. The study proposes new materials discovery and architecture development to achieve single-molecule strong coupling or tailored molecules for polariton OLEDs.
Researchers discovered how red and blue LED light promotes chlorophyll degradation and carotenoid synthesis in mandarin fruit. The study found that the protein CcUNE10 plays a key role in this process, enhancing research on the bHLH transcription factor family's function.
Researchers are exploring halide perovskites, a material that converts sunlight into energy efficiently. The team created distinct properties using ultra-cool methods, enabling mass production of solar cells.
Researchers develop new organic LED material that maintains sharp color and contrast while replacing heavy metals with a hybrid material. The material achieves stable, fast phosphorescent light emission, necessary for modern displays operating at 120 frames per second.
Researchers have designed a new strategy for creating pure-red organic light emitting diodes (OLEDs) with improved efficiency and color purity. The molecule BNTPA achieves record-breaking external quantum efficiency, making it suitable for next-generation high-definition displays and energy-efficient lighting systems.
A study published in PLOS ONE found that antimicrobial photodynamic therapy using annatto colorant was effective in treating halitosis in mouth-breathing children. The researchers used a LED light source to target the annatto, which generated reactive oxygen species that killed bacteria on the tongue, leading to improved oral health.
A team of researchers at Nagoya University has developed a way to make LEDs brighter while maintaining their efficiency. By tilting the InGaN layers and cutting the wafer into different orientations, they have found that LEDs with lower polarization but in the same direction as standard LEDs show greater efficiency at higher power.