Quantum Dots - Page 3

AUO has demonstrated its latest microLED displays at Display Week 2023. Most of these displays have been shown before, but this was an impressive lineup for the Taiwanese display maker, and we'll detail the displays below.

So first up we have the 13.5" 1920x1080 (163 PPI) transparent microLEDs, which AUO says is the highest-resolution transparent microLED display ever demonstrated. The display offers a transparency of 55% and a high brightness of 5,000 nits. The microLEDs used in this display are 30 micron in size.

AR microLED microdisplay developer Mojo Vision announced that it has achieved a process milestone and has lit-up its first 300 mm GaN-on-Silicon blue microLED array wafer. The company says it is on track to maturing its 300 mm CMOS fab process.

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Mojo Vision is developing microdisplays based on blue LEDs and quantum dots color conversion. The company developed the world's highest density microLEDs, achieve up to 28,000 PPI (sub-micron LEDs).

XTPL and QustomDot have joined forces in a EU-supported consortium that aims to develop printed and flexible microLED displays (BAMBAM*). We are excited to announce that the two companies have tested a new generation of InP-based quantum dot (QD) inks that have the potential to revolutionize the field of microLED displays. The experiments showcase the excellent compatibility of QustomDot's unique red and green inks with XTPL’s state-of-the-art Delta Printing System.

QD inks deposited with unparalleled precision, accuracy and uniformity, as attested by a reproducibility of the deposited droplet diameter is 3,5 µm and its height below 300 nm – well within the requirements for microLED. Being able to do this on both hydrophobic and hydrophilic surfaces, our solution further highlights the versatility towards different integration flows. The prints are capable of satisfying the current demands for display printing and the prospective requirements for manufacturing microLEDs. The combined impact of XTPL’s printing system and QustomDot’s QD inks indicates that this technology is incredibly versatile, and presents exciting opportunities for expanding the use of QD-based ink printing on a larger scale. The results have been nothing short of spectacular!

We're happy to interview QustomDot, as part of our series of interviews with MicroLED Industry Association members. QustomDot is an early stage company that develops quantum dots materials tailored for microLED display applications.

Hello! Can you introduce your company and technology?

Kim De Nolf, QustomDot's co-founder and CEO: QustomDot is a technology startup that specializes in the development of customized quantum dots for down-conversion applications. Quantum dots are semiconductor nanocrystals that exhibit unique optical properties, making them useful in areas such as displays, solar cells, and biomedicine.

Hon Hai Precision Industry (Foxconn) has announced that it has developed a new microLED microdisplay, in collaboration with Ennostar and Unikorn Semiconductor (a part of Ennostar). The company is showcasing the display at Touch Taiwan 2023 - a monochrome blue 0.12" 6500 PPI 200,000 nits display.

Foxconn says that the companies have optimized the structure of the microLED chips in a join project, and developed a new thin film protection technology tat reduces surface defects, improves external quantum efficiency, and increases product reliability. Foxconn has also developed its own quantum dots based color conversion technology that enables it to convert the display to full-color (that achieved a PPI of 3,600).

MicroLED microdisplay developer Mojo Vision announced that it has raised $22.4 million in a Series A investment round, to further develop and commercialize its microLED display technology. 

Researchers from Korea's KIMM institute have fabricated full-color flexible microLED devices, using blue LEDs and perovskite quantum dot color conversion layers. The demonstrated device featured  1 mm pixel pitch LEDs (25.4 PPI) and could be bent with a radius of 5 mm without being damaged.

The researcher used a perovskite-QD and siloxane composite using ligand exchanged PQD with silane composite followed by surface activation by an addition of halide-anion containing salt. Due to this surface activation, the researchers say that it was possible to construct the PQD surface with a silane ligand using a non-polar organic solvent that does not damage the PQD. As a result, the ligand-exchanged PQD with a silane compound exhibited high dispersibility in the siloxane matrix and excellent atmospheric stability.

China-based MicroLED microdisplay developer Jade Bird Display announced that it has developed a higher-efficiency AlGaInP-based (native) red microLED, that achieves a brightness of 750,000 nits, an increase of 50% compared to its currently-used emitter. The company says that this it the industry's brightest native red emitter.

JBD says that it managed to redistribute the local charge carriers by a breakthrough in surface treatment process and in this way, minimize the surface non-radiative recombination and boost the efficiency. The company says it expects to implement this technology in mass production by middle of 2023.

Last month AR developer Mojo Vision announced that as it finds it challenging to raise more funds, it is changing its focus to develop its microLED display technology, and canceling its smart contact lens system R&D project.

A couple of years ago, Mojo Vision announced that it has developed a 14,000 PPI monochrome (green) microLED microdisplay, that is the world's highest density microdisplay. The company now updated its website, which says that its technology can reach up to 28,000 PPI.

The MicroLED Industry Association announced two new topical webinars, private events for association members. This is in addition to the upcoming Perovskite webinar and AR webinar.

The first webinar is focused on quantum dots (QD) technologies. In this webinar, we hope to learn more about the state-of-the-art QD and color conversion R&D, with a focus of course on applications in the microLED industry. The event will take place on March 6^th, and here's the agenda:

• Prof. Dmitri V. Talapin: world-leading QD researcher from the University of Chicago, who will update on the latest QA research
• Nanosys: leading QD developer (speaker TBD)
• GE: "Phosphor converted miniLEDs and microLEDs based displays" (MicroLED Association member)
• QustomDot: "InP-based quantum dots for color conversion in microLED applications" (MicroLED Association member)