China achieves breakthrough in long-life Perovskite LEDs by using a new fabrication technique.
Chinese researchers have made a significant advancement in extending the lifespan of perovskite light-emitting diodes (LEDs), according to the University of Science and Technology of China.
Led by Professor Xiao Zhengguo, a team from the university has introduced an innovative method to create all-inorganic perovskite films with larger crystal grains and improved thermal stability. This advancement pushed the LED brightness past 1.16 million nits and extended their operational lifespan to over 180,000 hours.
This development resolves a longstanding challenge where perovskite LEDs struggled to achieve both efficiency and long-term stability. According to Professor Xiao, the innovation paves the way for the widespread use of perovskite LEDs in high-end display technologies and ultra-bright lighting.
The team’s findings have been published in the scientific journal Nature.
Perovskite is a highly regarded material due to its impressive light-emission efficiency, low production cost, and adaptable processing methods, making it ideal for applications in solar energy, LEDs, and photodetectors.
However, in conventional perovskite materials, electrons and holes, key to light emission, do not interact effectively, reducing light output.
Previous efforts involved creating extremely small nanoparticles or thin layers of perovskite material to enhance light efficiency. Although this improved luminous efficiency, it came at the cost of brightness and lifespan, limiting commercial viability.
To address this, the research team adopted a completely new tactic. They added specific compounds to the perovskite material and used high-temperature annealing, resulting in films with larger crystals and fewer imperfections.
Professor Xiao explained that the resulting material has a more ordered internal structure, which substantially boosts both stability and brightness of the LEDs.
Their study showed that the new LEDs deliver a luminous efficiency above 22 percent, comparable to current commercial displays, and achieve extreme brightness levels of up to 1.16 million nits, far exceeding conventional OLED or LED screens.
Given that typical display brightness in daily use is a few thousand nits and standard use is around 100 nits, the new perovskite LED can theoretically last more than 180,000 hours, aligning with commercial LED product standards.
Related Posts
