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Researchers prepared all-inorganic perovskite green LED, a substantial increase in stability 

Recently, Professor Shi Zhifeng, associate professor of Material Physics of Ministry of Education of Zhengzhou University, collaborated with Jilin University to make new progress in new type perovskite-based light-emitting devices, and successfully prepared all-inorganic perovskite green LED with high efficiency and stability. The device exhibits excellent stability of operation.

For the perovskite LED, the work stability is the key to its practical application. However, the perovskite-based LED has been reported to use organic or polymer materials as the charge injection layer, and its instability is not conducive to the long-term operation of the device under high current. (Department of Materials Science and Engineering, Zhengzhou University, Key Laboratory of Materials Physics, Ministry of Education, Shi Zhifeng and others innovative use of inorganic oxide semiconductor as a charge injection layer, the first preparation based on CsPbBr3 quantum dot all inorganic heterostructure (p-NiMgO / CsPbBr3 / n-MgZnO / N + -GaN), the brightness of the device can reach 3809 cd / m2, external quantum efficiency of about 2.39%. More importantly, the multi-layer heterostructures can be operated continuously for more than 10 hours under no-package and air environment, and their working stability is much better than that using traditional polymer materials such as PCBM, PEDOT Or the like) as a carrier injection layer. The structure of the device can not only give full play to the unique advantages of high optical gain of CsPbBr3 quantum dot material, but also combine Zn (Mg) O, Ni (Mg) O thin film materials with mature technology, good electrical conductivity and crystal characteristics. Titanium Oxide LED and the study of the mechanism of electroluminescence is of great significance.