'Perovskite LED' Surpasses QLED Emerges

[Asia Economy Reporter Junho Hwang] Domestic researchers have developed a synthesis technology for high-purity perovskite quantum dots with an emission linewidth below 20nm (nanometers). This LED, which has better color reproduction than existing organic light-emitting diodes (OLEDs) or quantum dot light-emitting diodes (QLEDs), is attracting attention as a core technology that could realize next-generation high-color-purity displays.

Professor Sanghyuk Lim's research team from the Department of Chemical and Biological Engineering at Korea University announced on the 4th that they have developed, for the first time in the world, a synthesis technology for high-purity red, green, and blue perovskite quantum dots with linewidths below 20nm. The related paper was published on the 2nd (local time) in the international journal Cell Reports Physical Science.

The research team developed perovskite nanocrystal (quantum dot) emitters capable of reproducing more accurate colors than displays currently used in smartphones or TVs.

Perovskite emitters are produced through a high-temperature solution process. Color tuning is achieved via halogen anion exchange reactions. However, due to uneven exchange reactions, the emission spectrum linewidth broadens, resulting in reduced color purity.

The research team solved this problem by using halogen acids that leave no impurities after the reaction. They developed a new synthesis method that enables uniform halogen anion exchange reactions at relatively low reaction temperatures. Through this, they developed perovskite emitters with high purity and uniform composition free of impurities.

This emitter has an emission spectrum linewidth below 20nm across the entire visible light range. Since existing displays have an emission linewidth of 30nm, this means it can realize high-purity natural colors that were previously unachievable.

Professor Sanghyuk Lim explained, "The significance of this research is that it verified the possibility that perovskite nanocrystal emitters can realize high-color-purity displays."

This content was produced with the assistance of AI translation services.