USTC develops ultra-stable perovskite LED with service life of over 180,000 hours

According to news on June 11, Professor Xiao Zhengguo’s team at the University of Science and Technology of China has made important progress in improving the life of perovskite light-emitting diodes (LEDs).

The research team proposed a new method called "weak spatial confinement" to prepare an all-inorganic perovskite film with larger crystal particles and more high temperature resistance, successfully increasing the LED brightness to more than 1.16 million nits and having a service life of more than 180,000 hours. Relevant results were published in the journal Nature.

Perovskite is a new material with superior performance. It has the advantages of high luminous efficiency, low cost, and flexible preparation. It is widely used in solar cells, LEDs, detectors and other fields. However, it is difficult for electrons and holes to effectively combine and emit light in traditional perovskite materials. Therefore, researchers often use "strong spatial confinement" strategies, such as preparing nanoparticles or extremely thin material layers, to improve luminous efficiency. However, this method limits the brightness of the LED and has a short lifespan, making it difficult to meet the needs of practical applications.

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In order to break through this bottleneck, Xiao Zhengguo's team proposed a new "weak spatial confinement" strategy, introducing hypophosphorous acid and ammonium chloride into the material, and using a high-temperature annealing process to prepare a new perovskite film with larger grains and fewer defects. The material has a more orderly structure, avoids defects caused by tiny crystals in traditional methods, and significantly improves the brightness and stability of LEDs.

Experiments show that the luminous efficiency of this new type of perovskite LED exceeds 22%, which is close to the level of commercial display products. Its ultimate brightness reaches 1.16 million nits, which is much higher than common OLED or LED screens on the market. Calculated at a conventional brightness of 100 nits, its theoretical life span exceeds 180,000 hours, reaching commercial-grade LED standards.

The research team stated that this breakthrough result not only breaks the technical problem of perovskite LED between efficiency and lifespan, but also provides the possibility for future application scenarios such as high-end display and ultra-high brightness lighting, pushing LED technology to a new stage.

This research was conducted by Peng Chenchen, Yao Haitao, Othman, School of Physics, University of Science and Technology of China Ali, special associate researcher Chen Wenjing, and researcher Yang Yingguo from the School of Microelectronics of Fudan University jointly completed the project. Professor Xiao Zhengguo is the corresponding author.