Perovskites

Researchers at China's Ningbo University have introduced two key molecular additives into CsPbBr₃ perovskite quantum dots (PeQD) inks: an organic pseudohalide, dodecyl dimethylthioacetamide (DDASCN), and a photosensitive ligand, pentaerythritol tetrakis(3-mercaptopropionate) (PTMP).

With this synergistic strategy, the team fabricated fully solution-processed green perovskite QLEDs that achieved a maximum luminance of 30,500 cd/m² and an external quantum efficiency of 18.6%, ranking among the highest reported for solution-processed perovskite QLEDs.

Material developer Avantama announced that it is set to sell its entire perovskite QD IP portfolio. The company says that it has managed to bring the technology to market-readyness level, and is looking for a company that will bring it to market. 

Ocean Tomo Transactions (a part of J.S. Held) will be representing Avantama in the sale of its pQD IP portfolio. The company has developed over 220 IP assets, which includes patents on processes, compositions, formulations, films, and devices for the commercialization of semiconductor nanoparticle and quantum dot inks and films.

DSCC says that the demand for QD materials in the display industry is growing, and the market will grow to $100 million in 2024. It will continue to grow and reach $122 million in 2027. 

The main application is in LCD displays (color conversion), but materials used in QD-OLED's (by Samsung Display) is growing and accounts for 31% of the market (in the chart above DSCC notes QD-OLEDs as QD-CC). Production of QD-OLED panels is limited (SDC's total capacity is for around 2 million panels per year) but the material usage is large compared to QD-LCDs.

Canon announced that it has developed new perovskite quantum-dot inks for use in next-generation displays, with improved durability and potential for application in high-image-quality displays.

Canon's new perovskite quantum-dot inks are cadmium free, and thanks for Canon's proprietary technologies, the QDs feature protective shell that enables high lifetime and efficiency. Canon's QDs are about 20% more efficient in light converstion compared to standard QDs, and cover 94.4% of the BT.2020 color gamut - higher than regular InP quantum-dot inks (that usually cover around 88% of the same color gamut).

Display market research firm DSCC says that QDEF technology (QD films for LCD displays) will continue to grow at a fast pace, rising from $236 million in 2022 to $326 million in 2025. The main market will remain TV applications. This forecast does not include any perovskite-based films.

QDEF are quantum dots enhancement films, used to enhance the color gamut of LCD displays. The main display applications for QDEF are in TVs, monitors and laptops.

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

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.

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.

Nanomaterials 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.

Perovskite QD film developer Zhijing Nanotech updated that it recently concluded a successful pilot with TCL to produce 500 75-inch QD-enhanced LCD TVs with Zhijing's PQDF films.

The company reports that the TVs featured a wide color gamut, 147% BT709 - which is higher than most QD TV's on the market, and higher than TCL's original 75M10 TVs. The green Cadmium-free pQD films have excellent optical properties and offer lower cost compared to current QD solutions, according to Zhijing Nanotech.