QD-EL - Page 2

Researchers from MIT have devised a new method to precisely assemble arrays of quantum rods, using scaffolds made of folded DNA. Using this method, the orientation of the rods can be controlled, which is a key factor in determining the polarization of light emitted by the quantum rods array.

The method starts by attaching the quantum rods to diamond-shaped DNA origami structures, built at an exact size required by the device. The structures are then attached to a surface, where they fit together "like puzzle pieces". 

Poland-based QNA Technology, a quantum dots developer and producer, raised $4 million in its latest financing round,and the company is now preparing to apply for a listing at the Polish ASO NewConnect stock exchange for early stage companies.

QNA was established in 2016, and is focused on blue light (400-490 nm) emitting, heavy metal-free quantum dots. The company optimizes its QDs for two applications: electroluminescence display devices (QD-EL) and for microLED displays devices based on UV microLEDs.

China-based BOE has demonstrated a new 4.7" AMQLED display prototype, a self-emissive QD based panel.

The panel offers a resolution of 1440x2560 (650 PPI), a color gamut of 85% BT2020 and a high contrast ratio (rated at 10,000,000:1).

Researchers from Samsung Display, led by Changhee Lee, developed an all-inkjet-printed 12.4" full color 182 PPI EL-QD display, that offers improved performance.

The researchers say that by controlling carrier transport properties and charge balance through ligand exchange in QDs and ZnMgO surface, they were able to create this display that has a potential for low cost and material-consumption-efficient display manufacturing. The researchers will disclose the paper at SID Displayweek 2023 next week.

Researchers from Kyung Hee University and the Korean Institute of Science and Technology have demonstrated that a low-temperature processed PTAA hole transport layer (HTL) can improve the performance of flexible light emitting quantum dots (QD-EL, or QLEDs) - produced on plastic substrate.

The researchers say that using a low-temperature process ensures that the flexible substrate is not deformed. Such QLED devices suffer from low performance compared to glass based devices that use optimal PTAA HTLs, but the new process and materials improve the flexible devices closer to glass based ones.

According to reports, Nanosys demonstrated a QD-EL (QLED) display at CES 2023 in a private room. The company showed a 6" display. This was an early prototype - the company said that it won't have a commercially-ready blue QD emitter by 2025/2056 at the earliest.

Nanosys brands the technology as NanoLED.

Developing blue-emitting quantum dots is highly challenging, and researchers from the University of Tokyo says that using a new bottom-up design strategy and self-organizing chemistry they have managed to create a high purity blue-emitting QD material (with a narrow emission spectrum).

The new QDs are made from special chemical composition that combines both organic and inorganic substances, such as lead perovskite, malic acid, and oleylamine. The materials self-aligned into a cube of 64 lead atoms. The lead researcher, Professor Eiichi Nakamura, says that "it took over a year of methodically trying different things to find that malic acid was a key piece of our chemical puzzle".

In the next two weeks, Toray Research Center (TRC) is hosting online webinars focused on display technologies. TRC, who supplies technical analysis and support for R&D and manufacturing, invites you to attend the online lectures at no cost, to learn more about QD, microLED and OLED technologies.

The webinars include recorded presentations, which will be available online up until to November 22. You can register for the webinars here.

BOE Technology Group unveiled a 55" 8K AMQLED device, which is said to be the world's first such display. The display is based on QD emitters, and uses an active-matrix Oxide-TFT backplane.

BOE says that all functional layers, except the cathode, were deposited using inkjet printing.

UK-based OTFT-developer SmartKem and QD pioneer Nanosys announced a joint-development project to work on low-cost printed QD displays, that will combine SmartKem's printed organic TFT with Nanosys' quantum dots emitter platform.

Nanosys now refers to its emissive (electroluminescent) QD technology as nanoLED. Both technology platforms, the OTFT backplane and the NanoLED frontplane are solution-based, which could indeed result in a low-cost production process.