Recently, the team of Jin Shengye, a researcher of the ultrafast time-resolved spectroscopy and kinetics group (Group 1110), Dalian Institute of Chemical Physics, Chinese Academy of Sciences Conditions, successfully achieved continuous, reversible, wide range, high stability of luminescent color control, found that manganese ion doped perovskite single crystal fluorescence dynamics control mechanism. CsPbX3 (X = Cl-, Br-, I-) perovskite material has advantages in relatively stable physical and chemical properties, high fluorescence quantum yield and continuously adjustable semiconductor energy band structure in light-emitting devices and other fields Show great potential for development. 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 simultaneously to control the emission color, which causes practical Inconvenience. The research team reported for the first time that Mn2 + doped CsPbCl3 crystallites achieved dual-wavelength fluorescence emission of excitons (blue) and Mn2 + ions (orange) through an internal energy transfer process. On the premise of not changing the chemical composition of the material, by changing the excitation light intensity, in a single crystallite, the continuous, reversible and wide-range control of the luminescence color has been successfully achieved. In addition, the team used time-resolved spectroscopy and temperature-dependent experiments to confirm that in Mn2 + -doped CsPbCl3 crystallites, the energy transfer from excitons to Mn2 + is achieved through some shallow defect states as a medium, and Mn2 + fluorescence under high excitation power The saturation of strength 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 light-emitting characteristics and light stability, Mn2 + doped CsPbCl3 crystallites are expected to be used in micro-nano light-emitting devices. The above work is supported by the National Natural Science Foundation of China, the National Key R & D Program "Nano Science and Technology" key special project, and the Chinese Academy of Sciences ’Strategic Pilot Technology Special Project (B)" Essence and Regulation of Energy Chemical Conversion. " Related research results were published in the Journal of the American Chemical Society (J. Am. Chem. Soc.). Automatic Door Operator,Dorma Automatic Door Operator,Door Sensor Operator,Automatic Door Opener Operator Caesar door control co.,ltd , https://www.caesar-door.com
Manganese ion-doped perovskite single crystal fluorescence kinetics regulator discovered by Dalian Chemical