Recently, Han Keli, a researcher of the Complex Molecular System Reaction Dynamics Group of Dalian Institute of Chemical Physics, Chinese Academy of Sciences, has made progress in the research of non-lead dual perovskite nanocrystals. For the first time, the team synthesized nanocrystalline Cs2AgBiX6 (X=Cl, Br, I) with a cubic phase of non-lead double perovskite and found that its hot carriers have ultra-fast cooling time (less than 1ps, 1ps=10-12s). ), indicating that the material is a good luminescent material. The lead-containing perovskite nanocrystalline CsPbX3 (X = Cl, Br, I) has the advantages of large absorption coefficient, high luminescence quantum yield, and easy band gap adjustment, and is widely used in light emitting diodes (LEDs), nano lasers, solar cells, and the like. Photoelectric detectors and other related research, but the lead contained in the heavy metal elements will cause harm to the environment and humans, limiting its commercial application. The search for non-toxic and high-performance non-lead perovskites has become a hotspot and difficulty in the current field of research. Researchers have tried to replace lead with less toxic Bi elements to form low-dimensional perovskite structures. For the first time in 2017, the team successfully synthesized Bi-containing non-lead perovskite nanocrystalline Cs3Bi2Br9, and revealed its luminescence kinetic mechanism. On this basis, team members used solution method to further synthesize Cs2AgBiBr6 double perovskite nanocrystals. The introduced Ag+ ions can form three-dimensional cubic phase perovskites with Bi3+ ions through the use of different halogen elements (Cl, Br, I). The nanocrystal can adjust its luminescence spectrum in the range of 395-575 nm. The hot carrier kinetics study found that the material has an ultrafast hot carrier cooling time (less than 1ps). This performance is similar to that of lead-containing perovskite nanocrystals, indicating that the non-lead calcium titanium The ore nanocrystals are likely to replace the current lead-containing perovskite nanocrystals and have very broad application prospects. In addition, the study also proposes a new solution to improve the material properties by reducing surface defects. Relevant research results were published in the "German Applied Chemistry" as a hot article. The study was funded by key projects of the National Natural Science Foundation of China.
Lanejoy is all kinds of spring Manufacturer at china 10 years, we had made compression spring, Wire Spring, Torsion Spring, Tension Spring, recoil spring and so on.
we also can do for OEM OR ODM
compression spring,wire spring,torsion spring,tension spring,recoil spring Shenzhen Lanejoy Technology Co.,LTD , https://www.copper-nut.com
Dalian Institute of Materials Research progresses in non-lead double perovskite nanocrystals