Quantum dot (QD) technology has emerged as a major advancement enabling next-generation displays. The light emitted by these nanoscale semiconductor particles is dictated by their size, which ranges from 2 to 10 nanometers—blue is emitted by smaller dots, red by larger ones. Controlling the dots’ size, shape and chemical composition allows wavelength to be easily regulated.
One application in which QD has gained a foothold is enhancing backlighting in traditional liquid-crystal displays (LCDs), where the color gamut can be drastically improved. Blue light from the LCD backlight is absorbed by the dots, resulting in more vivid colors and improved color gamut. QDs give LCD the opportunity to continue its market domination in such applications as TVs, monitors and signage. In addition, researchers are actively looking into developing QD color filters/color-conversion layers and electroluminescent QD (self-emitting ELQD, also known as “QLED”).
Experts from Dow Electronic Materials well versed in the attributes and potential applications for QDs presented on the subject at two industry events held earlier this year.
In February, at the Korean Information Display Society (KIDS) QD & PV Research Group Workshop on QD Materials and Devices, Sung-Kyung Yim, QD Marketing Manager, Display Technologies, presented “Market Outlook: Perspective of Quantum Technology.” In his talk, Mr. Yim observed that QD is one of the core technologies for realizing superior LCD picture quality, thanks to the dots’ high energy efficiency and broad color representation. He also looked at the R&D efforts being pursued to expand QDs’ application into new formats, including integrating a color-conversion layer into chip packaging and developing electroluminescent quantum dot (ELQD) displays.
At Quantum Dots Forum 2018, held in March in San Diego, Dr. Joo Jake, Quantum Dot R&D Manager, Emerging Technologies, Electronic and Imaging, presented on the recent development of cadmium-free Trevista™ QDs manufactured by DowDuPont™. Three different focused development activities were covered during his talk: QD film, QD color filter (QDCF) and ELQD. First, Dr. Joo shared QD film performance improvement by system-level approach, tackling both inherent QD properties and film integration opportunities. Next, he delved into QDCF, which can be adopted by multiple applications such as traditional LCD, blue microLED or blue organic LED (OLED). This approach can boost energy efficiency, as well as improve color gamut. QDCF’s main challenges (optical density and QD stability) and DowDuPont’s technical approaches were also discussed. Lastly, Dr. Joo presented a novel QD structural design based on ELQD device architecture and performance. These types of devices provide freedom of display form factor, in addition to the high color gamut and system efficiency offered by QD.