Quantum Dots

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)

MicroLED-Info and Perovskite-Info are happy to announce the 2023 edition of The Perovskite Handbook. This book is a comprehensive guide to perovskite materials, applications and industry, and it is now updated to January 2023 and lists recent developments and new companies, initiatives and research activities.

Perovskites are an exciting class of materials that feature a myriad of exciting properties. Perovskites are now entering the display market, with applications in quantum dots, LEDs, lasers and more.

Reading this book, you'll learn all about:

• Different perovskite materials, their properties and structure
• How perovskites can be made, tuned and used
• What kinds of applications perovskites are suitable for
• Perovskites Quantum Dots
• Perovskite solar cells, their merits and challenges
• Perovskites-based LEDs
• The state of the perovskite market, potential and future
   

The book also provides: a history of perovskite research, a guide to perovskite companies and developers, information on leading collaboration and development projects, a comprehensive list of perovskite companies and much more!

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 microLED, OLED and QD technologies.

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

Hong Kong based microLED microdisplay developer Raysolve Technology announced its first demonstration of a microLED microdisplay - a full-color 0.39" display.

The display is based on blue LEDs and a photolithographic QD color conversion layer. Raysolve is using a unique process, which is semiconductor process compatible, to create a novel optical design and material structure that achieves higher contrast, improved colors and a more efficient display.

QustomDot announced an agreement with France-based 3D GaN LED developer Aledia to co-develop a full-color microLED displays, based on Aledia's high-efficiency Gan-on-Silicon 3D Nanowire LEDs grown on 300 mm wafers coupled with QustomDot's high performance quantum dots color conversion technology.

QustomDot developed a patented method to produce high-quality and stable QD materials suitable for microLEDs, that are heavy metal free. A few months ago the company announced it is co-developing microLED displays with MICLEDI.

TechBlick will soon host its virtual microLED and QD event, and here is a good preview of some of the technologies and advances that will be detailed during the event. MicroLED-Info readers enjoy a special discount to this interesting upcoming industry event.

We highlight important advancements in MicroLED and/or QD displays in this article using technology slides. These advancements of the art will be presented at TechBlick’s 2-day global conference on “Mini- & Micro-LED Displays: Markets, Manufacturing Innovations, Applications, Promising Start-ups” taking place online in TechBlick’s ‘in-person virtual’ platform on 30 Nov - 1 Dec 2022.

The agenda includes the likes of Samsung, Sharp, AUO, Coherent, ASMPT, Komori, CEA, Micledi, 3D Micromac, Allows Semiconductors, and many more. Full agenda can be seen here.

This conference is supported by the MicroLED Association.