South Korean researchers have developed a new technique in which light-emitting and electron-conducting layers are simultaneously transferred to a substrate, making displays much better for wearable devices, augmented reality or virtual reality.
Augmented reality and virtual reality technologies open up amazing possibilities. New display technology aims to make immersion in virtual reality even more realistic.
Photo: Panther Media/Gorodnikov
A research team led by Professor Ji Woong Yang of Daegu University of Technology in South Korea has developed a new technology for double-layer dry transfer printing in collaboration with other experts. The innovative technology could provide more realistic display representations in the future and greatly improve immersion in AR and VR applications. The technology is also expected to make great strides in mobile displays.
Revolutionary printing technology for displays
With the increasing demand for mobile and portable devices, especially in the field of augmented reality and virtual reality technologies, the need for high-resolution and efficient displays is also increasing. However, the technologies used so far have reached their limits, especially when it comes to luminescence efficiency. This is where the new technology comes in, which makes it possible to transfer both light-emitting and electron-carrying layers to the substrate at the same time.
Double-layer dry transfer printing technology overcomes previous challenges in producing ultra-high-resolution displays. Conventional methods using quantum dot ink have low efficiencies, less than 5%, making them unsuitable for practical use. However, the new method achieves an external quantum efficiency (EQE) of up to 23.3%. This is achieved by reducing the interfacial resistance and improving electron injection.
Quantum dot nanoparticles for next generation displays
Due to their high color purity and excellent color rendering, quantum dot nanoparticles are well on their way to establishing themselves as the standard materials for next-generation displays. The new technology takes full advantage of these properties and enables ultra-fine patterns with pixel densities of up to 25,526 ppi. Through repeated printing, the team was also able to coat an area of 8 × 8 cm, highlighting the potential for mass production.
Applications in augmented reality and virtual reality
The development of this technology opens up new possibilities for use in augmented reality and virtual reality applications. Previous display technologies were only able to meet the high requirements for resolution and color reproduction insufficiently. However, with the new technology, it is now possible to produce displays that not only meet these requirements, but also exceed them. This could lead to a more intense and realistic experience in virtual worlds.
Professor Ji-Wong Yang emphasized the importance of this development: “The light-emitting devices manufactured using this technology have extremely high efficiency, which is consistent with the theoretical maximum efficiency of quantum dot displays.” Professor Moon-Ki Choi added that this technology is particularly suitable for use in mobile devices because it ensures high color rendering and color purity.
Future prospects
The research results have already been published in the renowned journal Nature Photonics and demonstrate the enormous potential of the new technology. The project was supported by the National Research Foundation of Korea and Samsung Future Technology Development Program, among others. In the coming years, this technology could make a significant contribution to making AR and VR applications more realistic and immersive.
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