Technical / research

Notion Systems installs an inkjet printing system at ITRI for QLED and OLED R&D

Notion Systems, a leading solution provider for industrial inkjet systems, announced that it had successfully installed an n.jet display system at Taiwan's Industrial Technology Research Institute (ITRI). The n.jet display system was developed in collaboration with MBraun/Germany and includes a fully integrated inert glove box solution that combines compact design with minimized nitrogen consumption.

Notion Systems n.jet display system photo

ITRI is now using the new n.jet display system to research and develop novel QLED and OLED technologies. ITRI is looking to replace vapor deposition and vacuum coating with inkjet printing which could reduce the number of steps, increase material utilization and increase display quality.

Read the full story Posted: Feb 19,2022

Ergis develops customizable high-performance QD barrier films

Last year, Poland-based Ergis Group launched an OLED encapsulation film platform called Ergis noDiffusion®. The company is currently testing its film solutions at customer sites in Asia, the EU and the US, and it is now starting to offer the same platform for the protection of quantum dot films (QD films) used in display and lighting applications.

Ergis noDiffusion QD barrier image

These new films can be tuned to fit specific needs. Ergis can deploy its films on several substrate types, with varying film thickness, and the barrier properties can be tuned to be between 10-6 to 10-3. This means that custom films can be created to suit the specific sensitivity of the QDs for water vapor and to achieve specific product lifetime or other required properties.

Read the full story Posted: Aug 12,2021

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.
 

Read the full story Posted: Mar 14,2021

LANL team develops electrically-pumped lasers from colloidal QDs

Researchers at Los Alamos National Laboratory (LANL) have assessed the status of research into colloidal quantum dot lasers with a focus on prospective electrically pumped devices, or laser diodes.

Their review analyzes the challenges for developing lasing with electrical excitation, and presents approaches to overcome them.

Read the full story Posted: Sep 08,2021

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.”

Read the full story Posted: Mar 09,2021

Newly-developed perovskite QDs are promising for display color conversion applications

Researchers from the Beijing Institute of Technology and MIIT have developed perovskite quantum dots microarrays with strong potential for quantum dots color conversion (QDCC) display applications.

 

Perovskite quantum dots microarrays with strong potential for QDCC applications, including photonics integration, micro-LEDs, and near-field displays. Image from Nano Research

Perovskite quantum dots (PQDs) hold potential as an attractive material and can resolve some of the problems found in conventional QDCC. While perovskite quantum dots are relatively new, they have already been shown to have attractive properties that make them extremely suited for electronic and optoelectronic applications.

Read the full story Posted: Jun 11,2022

Perovskite-based quantum dots show promise for high brightness emission

Researchers from Northwestern University developed a perovskite quantum-dots based emitter that features high stability, self-healing and very high brightness.

Perovskite-based self-healing quantum dots emitter photo

Perovskite QDs can realize single photon emission at room temperature and have excellent optical properties. The research team has developed a unique spray-synthesis method to create these pQDs which greatly increases the contact area of two different solutions, making it possible to grow a uniform protective organic layer on the surface of the quantum dots.

Read the full story Posted: May 27,2021

Researchers design a new method to deposit highly efficent QD-based emitters

A research team from POSTECH in Korea developed a new method of arranging quantum dots based on the coffee ring effect. The researchers dispersed the QD particles in a solution, and then evaporated it to perform the deposition, which causes the particles to automatically assemble in certain areas, like the edges of a single solution drop.

The researchers report that the QDs self-arranged in the form of very fine pixels, as they used a V-shaped structure. The QDs are driven toward the inner tips of the V-shape and accumulate there. This enables the creation of QD-based pixels that are 20 times brighter compared to regular QDs deposited without the V-shaped structure, and have a high uniformity rate of over 98%.

Read the full story Posted: Nov 26,2021

Researchers develop efficent SiQD LEDs from recycled rice husks

Researchers from Japan's Hiroshima University developed a new technique to create efficient silicon quantum dots from recycled rice husks. Rice husk is a good source of high-purity silica (SiO2) and silicon powder.

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Hiroshima University SiQDs LEDs from rice husks

The researchers created SiQDs that luminescence in the orange-red range with a high luminescence efficiency of over 20%. From the QDs the researchers created LEDs based on ITO glass substrates, using spin-coating to process the SiQDs.

Read the full story Posted: Apr 15,2022

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.

Read the full story Posted: Apr 03,2021