Dalian Institute of Chemical Physics, Chinese Academy of Sciences recently synthesized a new type of luminescent material, non-lead double perovskite nanocrystals, and used less toxic lanthanum elements to replace heavy metal lead. This new material is used in light-emitting diodes (LEDs), solar cells, It can effectively reduce costs, improve the efficiency of use, and avoid the harm caused by heavy metal lead to the environment and humans. Related research results as a hot article published in the recent "German Applied Chemistry".
The lead-containing perovskite nanocrystals have the advantages of lower cost, bright light, and high purity, and are therefore widely regarded as important next-generation luminescent materials. However, lead-containing perovskite nanocrystals contain lead, a heavy metal, and can cause environmental and human problems. Hazard, the search for non-toxic and good performance of non-lead perovskite has become a hot spot and difficult research.
A team of Hankley researchers from the Dalian Institute of Chemical Physics of the Chinese Academy of Sciences tried to replace lead with less toxic Bi (B i ) elements. In 2001, the first successful synthesis of non-lead perovskite nanocrystals containing B i was revealed. Its luminescence mechanism.
Recently, the team used the solution method to further synthesize double perovskite nanocrystals. The experiment proved that this material is a good luminescent material and has advantages in replacing lead-containing perovskite nanocrystals. Researchers further proposed The new scheme of improving luminous efficiency by reducing surface defects will vigorously promote the research and application of non-lead perovskites.
