Abstract:
CsPbX
3 perovskite semiconductor has received extensive research attention in the past decade due to its high light absorption coefficient, adjustable fluorescence emission in the visible light range, long carrier diffusion length and relatively good defect tolerance. It can be used as high-efficiency phosphors in electroluminescence quantum yield light-emitting devices. In order to obtain a wider range of fluorescence emission, the element composition and crystal arrangement of the perovskite nanocrystals can be adjusted by ion exchange or the introduction of guest transition metal ions into the host nanocrystals, which leads to the changes of the optical, electronic and magnetic properties of the host nanocrystal. Using the ligand-assisted reprecipitation method, nickel chloride was added to the precursor solution of manganese-doped perovskite (CsPb
xMn
1-x(Cl/Br)
3) nanocrystals (NCs). It was found that compared with the manganese-doped perovskite NCs, the Mn
2+ fluorescence intensity of the nickel-manganese co-doped perovskite NCs increased by about 100%, and the morphology changed from approximate cubic block (side length~14 nm) to nanowire (width 2~3 nm). This can be attributed to the fact that the addition of nickel ions reduces the (100) surface energy, and the fully dissolved precursor gets more crystal nuclei and thereby induces the growth of perovskite nanowires. Subsequently, nanowires were used as phosphors and commercially available UV chips to construct a simple light-emitting diode device. Its strong and broad orange fluorescence emission confirmed the potential performance of the prepared Cs(Pb
xMn
yNi
1-x-y)(Cl/Br)
3 nanowires in light-emitting applications. Finally, nickel chloride was added to the manganese-doped zero-dimensional networked perovskite (Cs
4Pb
xMn
1-x(Cl/Br)
6), and the nickel-manganese co-doped zero-dimensional networked perovskite nanowires verified the growth mechanism of the perovskite nanowires. All the results provide a reference for the synthesis of novel doped perovskite nanowires.