Articles tagged with Excitons
Researchers from ITMO University and their European colleagues created quasiparticles called excitons, fully controllable and room-temperature capable. These particles can generate light in LEDs and lasers, while also being used for recording optical signals.
Researchers have found Fermi polarons, a new type of quasiparticle, in a certain type of semiconductors. This discovery challenges the previous assumption that excitons or trions are formed instead. The study provides valuable insights into the material's properties and has implications for basic research and potential applications.
Scientists have found that dye molecules can transfer energy quickly to each other, even when they are different types, which could lead to more efficient ways of harnessing sunlight. This discovery was made using special aggregates of four chromophores and was confirmed by X-ray structural analysis.
A new thermally activated delayed fluorescence (TADF) material has been developed, displaying emission of light in colors from green to deep-red through intersystem crossing. This breakthrough contributes to the development of inexpensive and highly efficient OLEDs.
Researchers at UC San Diego, MIT, and Harvard have engineered 'topological plexcitons,' energy-carrying particles that enhance exciton energy transfer, leading to improved solar cells and miniaturized optical circuits. The discovery provides a directionality feature for efficient energy distribution in nanoscale materials.
Researchers create quasiparticles, directly observe collision events using laser pulses, and shed light on quasiparticles and many-body excitations in condensed matter systems. The findings demonstrate that basic collider concepts from particle physics can be transferred to solid-state research.
Researchers at ORNL have developed a new method that provides unprecedented detail on energy flow in nanometer scale, enabling the improvement of solar cells' performance. The technique uses femtosecond transient absorption microscopy to extract images with single-pixel precision.
A team of US/UK physicists has developed a new material that can control excitons at room temperature, making it easier to manipulate these bound pairs of electrons and electron holes. This breakthrough could lead to the creation of new optoelectronic devices for commercial applications.
Scientists at Kyushu University developed a strategy to widely vary the emission color and efficiency of organic light-emitting diodes based on exciplexes by changing the distance between key molecules. This technique could lead to new kinds of electronic devices with switching behavior or light emission that reacts to external factors.
Researchers at the University of Washington successfully combined two different ultrathin semiconductors to form a new two-dimensional heterostructure. This device allows excitons to be preserved in valleys, enabling critical steps in developing nanoscale technologies that integrate light with electronics.
Researchers demonstrated triplet exciton energy transfer from semiconductor nanocrystals to surface-bound molecular acceptors, extending the original excited state lifetime. This finding has implications for fields like solar energy conversion and optoelectronics.
Researchers from KIT and CYNORA directly measured the speed of intersystem crossing in a copper complex, improving the understanding of TADF mechanisms. This leads to enhanced energy efficiency in organic light-emitting diodes (OLEDs), with potential applications in display technology.
Researchers observed entangled states in organic molecules, allowing for the control of singlet fission and potentially doubling electrical current in solar cells. The team developed a model showing that quantum dynamics play a crucial role in optimizing fission.
Engineered viruses were used by MIT researchers to achieve a significant efficiency boost in a light-harvesting system, utilizing quantum effects to enhance exciton transport. The team successfully more than doubled the speed of excitons, increasing the distance they traveled before dissipating.
Researchers at the University of Vermont have developed a new method to create an 'electron superhighway' in organic materials, allowing electrons to flow faster and farther. This breakthrough could lead to improved solar cells and flexible electronics with enhanced efficiency.
Researchers explain the causes of singlet exciton fission, a process that could double electrical current from blue and green light in solar cells. By understanding this mechanism, they may develop new materials to enhance solar cell efficiency.
Researchers at Berkeley Lab have discovered a new pathway to valleytronics by selectively controlling photoexcited electrons/hole pairs in different energy valleys. This technique, based on the use of circularly polarized femtosecond light pulses, enables ultrafast manipulation of valley excitons for quantum information applications.
Researchers develop a new technique to investigate the role of material structure on organic solar cell efficiency. They find that well-organized structures do not lead to higher free electron generation rates than disorganized ones.
Four pulses of laser light on nanoparticle photocells reveal how captured sunlight can be converted into electricity. The study, published in Nature Communications, uses a novel approach to understand multiple exciton generation in nanomaterials.
Researchers at MIT and Harvard University have found a way to render excitons immune to defects, improving photovoltaic devices' efficiency. The team used topological protection to create excitons that move only on the surface of materials, governed by applied magnetic fields.
Researchers have discovered a process called singlet fission that can increase solar cell efficiency by as much as 30 percent. This breakthrough has the potential to make solar cells more energy-efficient and widely adoptable.
Researchers at the University of Pittsburgh have detected a fundamental particle of light-matter interaction in metals, known as an exciton. The discovery provides a microscopic quantum mechanical description of how light excites electrons in metals.
Researchers at MIT and City College of New York directly image exciton movement using a new technique, enabling insights into device efficiency and natural energy-transfer processes. The study provides new information on how crystal structure affects exciton diffusion.
University of Cincinnati researchers are working on a new technology that manipulates light to create super-lenses with seven times the strength of a standard microscope, allowing for better viewing of tiny objects. The team also explores hiding objects in plain sight by cloaking them with metamaterial films.
Belgian scientists applied a particle physics analogy to describe exciton behaviour in two graphene layers, mimicking parallel worlds. The approach reveals swapping effects between layers under specific electromagnetic conditions, similar to brane theory predictions.
The Stanford team found that the 'hot exciton effect' does not exist, contradicting widely accepted scientific theory. Instead, they suggest that disorder at the molecular level may play a key role in separating electron-hole pairs, leading to improved energy efficiency.
Scientists have developed more efficient organic solar cells by harnessing the power of polarized excitons. This breakthrough could make solar energy a cost-effective alternative to conventional sources. Researchers are exploring new materials to improve efficiency and competitiveness.
Physicists have successfully trapped and cooled exotic particles called excitons, condensing them into a giant matter wave that coheres at extremely low temperatures. This breakthrough allows scientists to better study the physical properties of excitons, promising applications in efficient solar energy harvesting and ultrafast computing.
Researchers at Rice University have figured out the source of colorful armchair nanotubes: hydrogen-like objects called excitons. The team found that exciton resonance occurs around a unique electronic structure in these one-dimensional materials, making them visible to our eyes.
Researchers at Kyoto University have discovered a way to create ultra-high-speed transistors and high-efficiency photovoltaic cells using terahertz pulses. The study found that exposing gallium arsenide to a single-cycle terahertz pulse increased electron density by an astonishing 1,000-fold.
Researchers from Lehigh University have developed an imaging technique that allows them to directly observe light-emitting excitons as they diffuse in a new material called rubrene. This breakthrough is crucial for plastic solar cell technology, where exciton diffusion is a major challenge.
Researchers at Kiel University have discovered a novel state of crystal matter with both compressible and incompressible properties. The discovery was made using extensive computer simulations and sheds light on the behavior of excitons, hydrogen atom-like bound states of electrons and holes.
Researchers at the University of Pennsylvania have successfully increased light-matter coupling strength in nanoscale semiconductors, paving the way for designing faster and more efficient photonic devices. By fabricating structures with surface passivation techniques, they were able to overcome the limitation of bulk materials.
Physicists at Rutgers University have discovered new properties in a material that could result in efficient and inexpensive plastic solar cells. The discovery reveals that energy-carrying particles generated by packets of light can travel much farther in organic semiconductors, increasing the practicality of solar-generated electricity.
Polymeric solar cells face challenges due to their interpenetrating structures, which impede the travel of energy-carrying excitons. The team hopes to develop more efficient solar cells by understanding and addressing this structural issue.
Scientists at UCSD have successfully built an integrated circuit that operates at 125 degrees Kelvin, a temperature easily attainable commercially with liquid nitrogen. This breakthrough enables faster and more efficient computation and communication devices.
Researchers at the University of Toronto have developed a new light sensor that can generate multiple excitons per photon, breaking conventional limitations in semiconductor devices. This breakthrough has the potential to significantly improve the sensitivity and efficiency of digital cameras, leading to better low-light picture quality.
A team of researchers from the University of Warwick has discovered a way to use doughnut-shaped quantum dots to slow and freeze light, paving the way for more efficient and effective light-based computing. This technique has significant implications for the development of 'slow glass' that can re-release photons in sequence.
Researchers at the University of Oregon found that manipulating excitons in a semiconductor material can control electron spin, providing a new method for selectively manipulating spins. This discovery may prove useful in emerging optic devices and quantum computers.
Researchers used nanotechnology to study exciton mobility on carbon nanotubes, revealing that each excition travels about 90 nanometers and visits some 10,000 carbon atoms during its lifespan. The unique properties of carbon nanotubes made them an ideal system for observing single-molecule reactions.
Physicists at UC San Diego observed spontaneous coherence in excitons, a bound pair of electrons and holes that enable semiconductors to function as novel electronic devices. This discovery could lead to the development of new computing devices and insights into quantum properties of matter.
Researchers at Rice University developed a new magnetic method to overcome the 'dark exciton effect' in semiconducting nanotubes, which could enable more efficient optical signals and reduced power demands in next-generation microchips.
Researchers from Pitt and Bell Labs have successfully created a two-dimensional semiconductor structure that allows excitons to exist longer and travel farther than previously recorded. This breakthrough could lead to the development of excitonic circuits for optical communication, enabling photons to be converted directly into excitons.
Researchers at Georgia Institute of Technology discover a way to boost the efficiency of polymer organic light-emitting diodes by biasing spin statistics. The new method could lead to more efficient devices with an increased percentage of light-emitting singlets.
Scientists at Berkeley Lab have observed a new exciton state that displays macroscopic ordering, indicating the formation of a Bose-Einstein condensate. This discovery holds promise for ultrafast digital logic elements and quantum computing devices.
Researchers develop dendrimer supermolecules that funnel light energy through a tree-like structure, directing it to a central point. The nanostar molecule can convert ultraviolet light into visible light with up to 99% efficiency, making it suitable for various applications such as solar energy harvesting and optical sensors.