The reporter learned from the University of Science and Technology of China that Professor Xiao Zhengguo's team has proposed a new method called "weak spatial confinement" to prepare an all inorganic perovskite film with larger crystal particles and higher temperature resistance. They have successfully increased the brightness of light-emitting diodes (LEDs) to over 1.16 million nits and a service life of over 180000 hours. The relevant research results have been published in the international journal Nature. Perovskite is a new type of material with superior performance, which has the advantages of high luminous efficiency, low cost, and flexible production. It has a wide range of applications in solar cells, LEDs, and detectors. However, due to the difficulty of effective collision and luminescence between electrons and holes in traditional perovskite materials, researchers have previously used the method of "strong spatial confinement". For example, making very small nanoparticles or extremely thin material layers to improve luminous efficiency. However, due to the difficulty of achieving high brightness, short service life, and only able to work continuously for a few hours, LED is difficult to apply in products in real life. To solve this problem, Xiao Zhengguo's team proposed a completely different strategy, namely "weak spatial confinement". They added two specific compounds, hypophosphite and ammonium chloride, to the perovskite material and prepared a new type of perovskite film with larger crystal particles and fewer defects through high-temperature annealing process. This new material has a more orderly interior, avoiding the defect problems caused by small crystals prepared by traditional methods, greatly improving the stability and brightness of LEDs. Research has shown that in terms of efficiency, the luminous efficiency of this new perovskite LED exceeds 22%, which is on par with the luminous efficiency of commercial display products. Compared with mainstream commercial OLED or LED screens on the market, the maximum brightness of the new perovskite LED reaches 1.16 million nits. The maximum brightness of display screens commonly used by people in daily life is usually within a few thousand nits. Based on a normal brightness of 100 nits, the new perovskite LED can theoretically be used for more than 180000 hours, which has reached a wide standard for commercial LED products. Researchers have introduced that this breakthrough technology not only successfully overcomes the technical bottleneck of perovskite LEDs in terms of efficiency and stability, but also has the potential to be widely applied in high-end displays, ultra-high brightness lighting, and other fields in the future, promoting LED technology into a new era. (New Society)