Box Resistance Furnace,Box Type Tempering Furnace,Industrial Ovens And Furnaces,Continuous Hardening And Tempering Furnace Changxing Jiacheng Furnace Industry Co. Ltd , https://www.jcfurnace.com
Fluorescence kinetics mechanism of manganese ion-doped perovskite single crystal discovered by Dalian Chemical Research Institute
[ Instrument Network Instrument R & D ] Recently, a researcher from the Institute of Chemical Physics of the Chinese Academy of Sciences, Dalian Institute of Chemical Physics (Group 1110) of the ultra-fast time-resolved Jin Shengzheng team in a single CsPbCl3 perovskite doped with manganese In the crystal, by changing the excitation conditions, the continuous, reversible, wide-range, and high-stability luminous color control was successfully achieved, and the mechanism of manganese ion-doped perovskite single crystal fluorescence kinetics was found.
CsPbX3 (X = Cl-, Br-, I-) Perovskite materials have the advantages of relatively stable physical and chemical properties, high fluorescence quantum yield, and continuously adjustable semiconductor band structure. Shows great development potential. Previously, research on the regulation of luminous color of perovskite materials has mainly focused on controlling the growth size of nanocrystals and adjusting the types and relative proportions of halogen ions. However, in these materials, the fluorescence emission wavelength has a one-to-one correspondence with its structural composition. If the emission color needs to be adjusted, the chemical composition of the material needs to be changed, or the use of multiple materials at the same time to achieve the adjustment of the emission color, resulting in practical applications. 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. Without changing the chemical composition of the material, by changing the intensity of the excitation light, continuous, reversible, and wide-ranging control of the luminous color in a single crystallite was 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 of excitons to Mn2 + is achieved through some shallow defect states as mediators, and Mn2 + fluorescence at high excitation power The saturation of the intensity results from the saturation of these defect states. The material exhibits high light stability in air, and can achieve continuous reversible spectral adjustment operations for more than 14 hours and more than 300 times. Considering its continuous, reversible, wide-range controllable luminescence characteristics and light stability, Mn2 + -doped CsPbCl3 microcrystals 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 key project of the National Key Research and Development Program "Nanotechnology" and the Strategic Pilot Project of the Chinese Academy of Sciences (B) "Essence and Regulation of Energy Chemical Transformation". Related research results were published in the Journal of the American Chemical Society (J. Am. Chem. Soc.).