Recently, the team of Jin Shengye, a researcher at the Dalian Institute of Chemical Physics, Chinese Academy of Sciences, successfully changed the excitation conditions in a single perovskite crystallite doped with positive divalent manganese ions, and successfully achieved continuous, reversible, wide range, and high stability luminescent color control , Found that the manganese ion doped perovskite single crystal fluorescence dynamics control mechanism. The research results were published in the Journal of the American Chemical Society. Perovskite materials, due to their relatively stable physical and chemical properties, high fluorescence quantum yield, and continuously adjustable semiconductor energy band structure, have shown great potential for development in light-emitting devices and other fields. Previously, the research on the color control of perovskite materials focused on controlling the growth size of nanocrystals and adjusting the types and relative proportions of the halogen ions of the materials. However, in these materials, the fluorescence emission wavelength corresponds one-to-one with the structural composition. If the emission color needs to be adjusted, the chemical composition of the material needs to be changed, or multiple materials must be used at the same time to realize the adjustment of the emission color, which brings practical application Inconvenient. The researchers reported for the first time that positive bivalent manganese ions doped single perovskite crystallites. Through the internal energy transfer process, dual-wavelength fluorescence emission of excitons (blue) and positive bivalent manganese ions (orange) was achieved. In addition, using time-resolved spectroscopy and temperature-dependent experiments, it was confirmed that the energy transfer of excitons to positive divalent manganese ions in the doped single perovskite crystallites is achieved through some shallow defect states as a medium. The saturation of the fluorescence intensity of positive divalent manganese ions at high excitation power comes from the saturation of these defect states. The material exhibits high photostability in the air, and can achieve continuous reversible spectral adjustment operations of more than 300 times over 14 hours. Considering its continuous color, reversible, wide-range luminescence characteristics and light stability, the positive divalent manganese ion-doped single perovskite crystallite is expected to be applied in micro-nano light-emitting devices. (Reporter Liu Wansheng correspondent Sun Qi)
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