Canon Inc. has developed a quantum-dot ink with a perovskite structure (‘perovskite quantum-dot ink’) with the potential to "help realize next-generation OLED displays with ultra-high definition, such as quantum-dot 8K displays, a technology that thus far has been unachievable.”
Perovskite quantum-dot inks developed by Canon emitting light
“The performance and image quality of display devices continue to rapidly improve, and towards this end, one such approach that is gaining momentum is applying quantum-dot technologies (QD) to meet the need for displays with higher image quality,” Canon said.
“Quantum dots are semiconductor nanocrystals that measure only a few nanometers in diameter and can emit light with high brightness and high colour purity. Displays with quantum-dot technology are attracting growing attention due to their wide colour gamut that makes possible high visual expressiveness. Therefore, quantum dots for display is sought to achieve higher colour purity and higher light utilization efficiency. In addition, though cadmium (Cd) has thus far been the preferred material for quantum dots, due to environmental concerns, there is a growing interest in Cd-free materials.
Perovskite quantum dots can express a wide range of colours
“With these requirements in mind, Canon has focused on the development of perovskite quantum-dot inks. Perovskite quantum dots are considered an effective Cd-free approach other than InP (indium phosphide) quantum dots. In terms of colour purity and light efficiency, many see perovskite quantum-dots as a promising material capable of contributing to high brightness, a wide colour gamut and high resolution. However, poor durability has thus far been a barrier to practical use.
“To address the issue of durability, Canon is leveraging its proprietary technologies nurtured through development of ink and toner for printers. The company has established a unique method to form a protective shell on quantum dots, thereby achieving practically durable perovskite-dot ink with retained colour purity and light usage efficiency. “Canon's quantum-dot inks have the potential to help realize next-generation OLED displays with ultra-high definition, such as quantum-dot 8K displays, a technology that thus far has been unachievable.”
The results of technological development of the ink and the technology for mass-production of high-quality perovskite quantum dots were announced at SID Display Week 2023 in Los Angeles, USA.
Colour gamut of the newly developed perovskite quantum-dot inks
What is a perovskite structure?
A perovskite structure is one type of crystalline structures. By changing the elements that compose a perovskite structure, a variety of properties can be manifested, including superconductivity, ferroelectricity, fluorescence and photoelectric conversion. Due to this versatility, a perovskite structure holds great potential for use as functional materials. In recent years, perovskite solar cells have attracted attention thanks to their low cost and versatility that enables them to be used anywhere.
