The Fraunhofer IAP sheds light on its QD-related research activities

Guest post by: Fraunhofer IAP & Fraunhofer CAN

"People push towards the light, not to see better, but to shine better" - Friedrich Wilhelm Nietzsche (1844 - 1900)

Quantum dots (QDs) represent the latest generation of hybrid inorganic-organic nanomaterials. They form a triad of inorganic nanotechnology, organic semiconductor technology and solution-based processability. The emission properties of inorganic, luminescent nanoparticles depend directly on the particle size. This size quantization effect makes it possible to control the band gap and thus the emission color of semiconductor materials. The target parameters are a high quantum yield of the luminescence as well as high stability and environmental compatibility.

Samsung Display to focus on QD Displays for its future large-area displays

Samsung Electronics reported its financial results for Q1 2021. The company's revenues was 65.4 trillion Won (around $58.7 billion USD). Operating profit increased 4% from the past quarter to $8.4 billion, as Samsung enjoyed strong sales of phones and consumer electronics, which offset slower sales of displays and semiconductors.

Samsung Display says that for large displays, it will "channel all its efforts towards preparing for the mass production of QD displays".

All the key players in Printed Electronics and Quantum Dots gather online

This is a sponsored post by TechBlick

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Researchers set out to uncover a process that hinders quantum dots' light emission

A team of researchers, which included scientists from SLAC, Stanford, the University of California, Berkeley and DOE’s Lawrence Berkeley National Laboratory, recently explained a process that interferes with making quantum dots brighter - when attempting to increase the intensity of emitted light, heat is generated instead - reducing the dots’ light-producing efficiency. The results of this new work could have broad implications for developing future quantum and photonics technologies.

First atomic-scale observations of how quantum dots lose their light-producing efficiency imageImage credit: Nature Communications/SLAC

In a QLED TV screen, dots absorb blue light and turn it into green or red. At the low energies where TV screens operate, this conversion of light from one color to another is virtually 100% efficient. But at the higher excitation energies required for brighter screens and other technologies, the efficiency drops sharply. Researchers theorized about why this happens, but no one had ever observed it at the atomic scale until now.

Samsung gets ready to produce QD-OLED TV and Monitor module samples

According to a new report from Korea, Samsung Display is set to begin producing full QD-OLED display prototypes in June this year. SDC will produce both TV and monitor prototypes, which it will send to potential customers (such as Samsung Electronics, Sony, and Chinese TV makers). When customers approve the prototypes, SDC will be ready for commercial production.

Samsung Display QD Display (QD-OLED) production equipment arrives at Asan line

The new report also says that Samsung Electronics TV unit (Visual Display Business) is ready to start adoption these panels provided SDC secures the yields and production capacity required by SE. Even if yields are high, total production capacity at SDC's Q1 production line is 30,000 8.5-Gen substrates, which may not be enough for Samsung's TV business.

Researchers use coherent spectroscopy to gain insights into perovskite quantum dots

Scientists at the Chemistry and Physics Institutes of the University of Campinas (UNICAMP) in the state of São Paulo, Brazil, in collaboration with scientists at the University of Michigan in the United States, have provides insights into the fundamental physics of perovskite quantum dots.

perovskites dispersed in hexane and irradiated by laser imageNanomaterials of perovskite dispersed in hexane and irradiated by laser. Light emission by these materials is intense thanks to resistance to surface defects (photo: Luiz Gustavo Bonato)

"We used coherent spectroscopy, which enabled us to analyze separately the behavior of the electrons in each nanomaterial in an ensemble of tens of billions of nanomaterials. The study is groundbreaking insofar as it combines a relatively new class of nanomaterials - perovskite - with an entirely novel detection technique," Lázaro Padilha Junior, principal investigator for the project on the Brazilian side, explained.

GS Alliance develops a graphene QD and silica composite to create efficient white LEDs

Japan-based material developer Green Science Alliance developed a new composite material made from a combination of graphene quantum dots and silica, useful to create white LEDs from blue LEDs (440-470 nm).

Green Science Alliance graphene QD + silica composite for white LED

The company says that this is the first adoption of such a material for LED applications. The company says the adoption of the QD and Silica offers superior performance to the currently-used phosphor as the QDs do not suffer from light scattering, and the white LED is more efficient. The material is also not expensive as the graphene QDs can be produced on the cheap. GS Alliance believes the new white LED will be cheaper than current white LEDs on the market.

New imaging technique can help pick out the most efficient carbon quantum dots

A new study by researchers from the University of Illinois Urbana-Champaign and the University of Delaware, Baltimore County, in a collaborative project through the Beckman Institute for Advanced Science and Technology at Illinois, used ultrafast nanometric imaging and found good and bad emitters among populations of carbon dots. This observation suggests that by selecting only super-emitters, carbon nanodots can be purified to replace toxic metal quantum dots in many applications, according to the researchers.

Cheap, nontoxic carbon nanodots poised to be quantum dots of the future image

“Coming into this study, we did not know if all carbon dots are only mediocre emitters or if some were perfect and others were bad,” said Illinois chemistry professor Martin Gruebele, who led the study. “We knew that if we could show that there are good ones and bad ones, maybe we could eventually find a way to pick the perfect ones out of the mix.”

Quantum Materials Corp announces a $15 million investment to accelerate its QD healthcare development project

US-based Tetrapod Quantum Dots developer Quantum Materials Corp (QMC) announced that is has received a $15 million investment from Pasaca Capital.

Quantum Materials red quantum dots PL photo

QMC develops QDs for several markets, including the display industry, but it is currently focused on the medical market. The company developed the use of quantum dots to verify covid-10 sample origins and track samples through the testing process. The company brands is medical solutions under the QMC HealthID brand, and the Pasaca Capital investment will support an expansion of the medical market.

Samsung Electronics commits to SDC's QD-OLED TV panels

According to industry reports, Samsung Electronics (finally) committed to adopt Samsung Display's QD-OLED TV panels, and plans to release its first QD-OLED TV in 2022.

Samsung Display announced a $10.85 billion investment in QD-OLED TV R&D and production line in 2019, and has started to produce prototypes towards the end of 2020. The company's plan is to start mass production by the end of 2021, in the first line (15,000 monthly substrates). SDC is also planning a second line to follow the first, to arrive at a total of 30,000 monthly 8.5-Gen substrates.