China's innovative perovskite film boosts LED brightness, extends lifespan
Perovskite, a high-performance material known for its luminous efficiency, low cost, and processing flexibility—with broad potential in solar cells, LEDs, and photodetectors—has traditionally faced a major challenge: inefficient recombination of electrons and holes, the charge carriers responsible for light emission.
Now, Chinese researchers are claiming to have achieved a major breakthrough in this regard. Led by Professor Xiao Zhengguo, a research team at the University of Science and Technology of China in Hefei has developed a novel method for fabricating all-inorganic perovskite films with larger crystal grains and improved heat resistance, paving the way for more durable and efficient perovskite LEDs.
According to Xiao, the innovation boosted LED brightness to 1.16 million nits and extended the operational lifespan beyond 180,000 hours—overcoming a long-standing bottleneck that prevented perovskite LEDs from achieving both high efficiency and stability, and opening the door for their potential use in advanced displays and ultra-high-brightness lighting, state-owned news agency Xinhua reported.
To enhance luminous efficiency, earlier efforts focused on creating ultra-small nanoparticles or extremely thin material layers. However, this approach came with major limitations—LEDs produced with these methods struggled to reach high brightness and often had lifespans of just a few hours, making them unsuitable for real-world applications.
Rather than relying on conventional approaches, the research team took a fundamentally different path to overcome the limitations of previous perovskite materials. By carefully introducing specially selected compounds into the perovskite composition and subjecting the material to a high-temperature annealing process, scientists were able to engineer a new type of perovskite film.
This advanced film features much larger crystal grains, which help facilitate better charge transport, and a substantially reduced number of defects, both of which are critical factors in enhancing the overall performance, stability, and longevity of perovskite LEDs.
Xiao explained that the novel perovskite material's enhanced internal structural order is crucial for significantly improving both the brightness and stability of the LEDs. The research also showed that the luminous efficiency of this new perovskite LED surpassed 22%, putting it on par with existing commercial display products and signaling a major advancement in LED technology.
In comparison with typical commercial OLED and LED screens currently available, the new perovskite LED achieves a notably high brightness of over a million nits. This level of brightness could make it well-suited for applications requiring strong visibility, such as outdoor displays and specialized lighting. Typically, everyday displays reach peak brightness levels of just a few thousand nits.
When operating at a more common brightness level of 100 nits, the new perovskite LED demonstrates a theoretical lifespan of close to 200,000 hours—well within the range needed to meet commercial LED product standards.
As noted by the scientific team, this extended durability not only ensures long-term reliability of their innovation, but also highlights the material's potential for practical, everyday use in a variety of display and lighting applications.
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