A team of Hankeli researchers from the Dalian Institute of Chemical Physics, Chinese Academy of Sciences synthesized unleaded and manganese ion-doped unleaded double perovskite nanocrystals, and discussed in detail their size effects and luminescence dynamics mechanism. The study found that unleaded double-perovskite nanocrystals doped with manganese ions emit blue fluorescence. By doping with manganese ions, bright orange-red fluorescence emission can be achieved, confirming the rational use of semiconductor nanomaterial sub-band design High-performance semiconductor nanomaterials have important guiding significance. Related research results were published in the "American Chemical Society · Central Science".
In recent years, non-lead double perovskite nanocrystals have received extensive attention, and are expected to overcome the toxicity and instability of lead-based perovskite nanocrystals and become an ideal luminescent material. Researchers are mainly concerned with the broad-band white light emission of perovskite nanocrystalline materials, while there are few studies on the fluorescence emission of other specific colors. Doping strategies can effectively improve the optical properties and stability of perovskite nanocrystalline materials. For the manganese ion doping system, luminescence of manganese ions as a dopant is an area of interest to researchers, but it is often accompanied by band-side emission or self-trapped emission that competes with it. In addition, the size effect and kinetic mechanism of manganese-doped non-lead double perovskite nanocrystals also need further study.
Recently, the team successfully synthesized undoped and manganese-doped sodium-based non-lead double perovskite nanocrystals with high crystallinity and uniform morphology. Sodium-based unleaded double-perovskite nanocrystals doped with manganese ions have blue fluorescence. After doping with manganese ions, they show a single, pure manganese dopant luminescence, which can emit bright orange-red fluorescence, the highest The fluorescence quantum yield reaches 44.6%, and the stability is also improved.
It is reported that the team combined steady-state and transient spectroscopy techniques to discuss in detail the luminescence kinetic mechanism of manganese-doped non-lead double perovskite nanocrystals, and further studied the size effect of the luminescence system of manganese dopant.