Scientists at Queen's University Belfast have been working as part of an international team to develop a new process, which could lead to a new generation of high-definition (HD), paving the way for brighter, lighter and more energy efficient TVs and smart devices.
The Queen's scientists have been working alongside a team of experts from Switzerland (ETH Zurich, Empa--Swiss Federal Laboratories for Materials Science and Technology), USA (Florida State University) and Taiwan (National Taiwan University of Science and Technology, National Synchrotron Radiation Research Centre).
The team's findings, which have been reported in Science Advances, reveal that when quantum dots - tiny flecks of semiconductor that are prized for their crisp colours - are clustered together they are more fluorescent, providing a wide variety of colours.
Through the project, quantum dots containing methylammonium lead bromine (MAPbBr3) were created. The experts found that by creating lamellar structures - fine layers, alternating between different materials - the human eye's response to the visible light was very high. This means that the material re-emitted a lot of the light that it absorbed and very bright colours were created. The team have named this process aggregation-induced emission (AIE).
The Queen's University team is led by Dr Elton Santos from the School of Mathematics and Physics.
Dr Santos said: "Through this research discovery, we anticipate that the number of colours a display can present can be increased more than 50 per cent. In practice, this means that we may have a new type of "high-definition" because of the number of colour combinations that the material can display. Therefore, the next HD generation is just as close as three to four years away."
Professor Chih-Jen Shih who created the quantum dots and led the investigation at ETH Zurich, commented: "Normally the quantum yield, which determines the brightness, degrades significantly as quantum dots aggregate, forming crystalline solids. However, our investigations show that brighter levels are achievable because of the new photonic process that we have discovered and have named aggregation-induced emission (AIE)."
Dr Santos said: "This AIE process can revolutionise the quality of the colours in TVs because the base colours are red, blue and green. Using AIE we can create the brightest green colour ever achieved by any nanomaterial. Once this bright green is integrated with the other two colours, the number of new colour combinations could exceed what is currently possible. The latest QD technology, which is just about to be released to market, allows for one billion colours, which is 64 times more than the average TV. However, what using the process we have discovered, we can actually make this even better."
Professor Shangchao Lin, who led the research at Florida State University, said: "Our findings also show that the perovskite nanocrystals emit light extremely quickly and are very energy efficient. This means reduction of electricity consumption, and consistent colour expression throughout a long lifespan."
The researchers are currently looking for similar processes for blue and red colours so that they can create the "holy-grail" of screen displays, which would replicate all of the colours that can be captured by the human eye.
In terms of timescales, Professor Shih says the research is almost ready for commercialisation: "The remaining tasks will be to enhance the stability of these compounds and to ensure that they can endure high temperatures, humidity and electrical energy being applied."
Emma Gallagher | EurekAlert!
Graphene origami as a mechanically tunable plasmonic structure for infrared detection
25.04.2018 | University of Illinois College of Engineering
Scientists create innovative new 'green' concrete using graphene
24.04.2018 | University of Exeter
At the Hannover Messe 2018, the Bundesanstalt für Materialforschung und-prüfung (BAM) will show how, in the future, astronauts could produce their own tools or spare parts in zero gravity using 3D printing. This will reduce, weight and transport costs for space missions. Visitors can experience the innovative additive manufacturing process live at the fair.
Powder-based additive manufacturing in zero gravity is the name of the project in which a component is produced by applying metallic powder layers and then...
Physicists at the Laboratory for Attosecond Physics, which is jointly run by Ludwig-Maximilians-Universität and the Max Planck Institute of Quantum Optics, have developed a high-power laser system that generates ultrashort pulses of light covering a large share of the mid-infrared spectrum. The researchers envisage a wide range of applications for the technology – in the early diagnosis of cancer, for instance.
Molecules are the building blocks of life. Like all other organisms, we are made of them. They control our biorhythm, and they can also reflect our state of...
University of Connecticut researchers have created a biodegradable composite made of silk fibers that can be used to repair broken load-bearing bones without the complications sometimes presented by other materials.
Repairing major load-bearing bones such as those in the leg can be a long and uncomfortable process.
Study published in the journal ACS Applied Materials & Interfaces is the outcome of an international effort that included teams from Dresden and Berlin in Germany, and the US.
Scientists at the Helmholtz-Zentrum Dresden-Rossendorf (HZDR) together with colleagues from the Helmholtz-Zentrum Berlin (HZB) and the University of Virginia...
Novel highly efficient and brilliant gamma-ray source: Based on model calculations, physicists of the Max PIanck Institute for Nuclear Physics in Heidelberg propose a novel method for an efficient high-brilliance gamma-ray source. A giant collimated gamma-ray pulse is generated from the interaction of a dense ultra-relativistic electron beam with a thin solid conductor. Energetic gamma-rays are copiously produced as the electron beam splits into filaments while propagating across the conductor. The resulting gamma-ray energy and flux enable novel experiments in nuclear and fundamental physics.
The typical wavelength of light interacting with an object of the microcosm scales with the size of this object. For atoms, this ranges from visible light to...
13.04.2018 | Event News
12.04.2018 | Event News
09.04.2018 | Event News
25.04.2018 | Physics and Astronomy
25.04.2018 | Materials Sciences
25.04.2018 | Studies and Analyses