Synthesis and Optical Properties of Mn²⁺-Doped Amino Lead Halide Molecular Clusters Assisted by Chloride Ion

Abstract

Mn2+-doped amino lead halide molecular clusters (MCs) are synthesized using amine (e.g., n-octylamine, or butylamine) as passivating ligand and MnX2 (X = Cl or Br) as the Mn2+ doping source at room temperature. Their optical properties are investigated with UV–visible absorption, photoluminescence (PL), and PL excitation spectroscopy. The Mn2+ precursor plays a vital role in the synthesis of Mn2+-doped MCs. MnCl2 seems to facilitate the incorporation of Mn. The MnCl2 doping causes electronic absorption blue shift and leads to a spin-forbidden 4T1 → 6A1 Mn d-electron emission. With the help of time-resolved PL, Fourier transform infrared, and electron paramagnetic resonance results, a model is proposed to explain the formation mechanism. We suggest that Mn2+ doping replaces Pb2+ is assisted by Cl– ions that replace Br– ions. This study demonstrates the possibility of doping MCs and has important implications in gaining new fundamental insight into the growth mechanisms of perovskite nanostructures.

Impact of Molecular Ligands in the Synthesis and Transformation between Metal Halide Perovskite Quantum Dots and Magic Sized Clusters

“…A similar preference of Mn 2+ doping in MCs was also reported, where no characteristic Mn 2+ d–d emission in the product was observed when MnBr 2 was used (Figure c) . The Mn 2+ precursor was suggested to play a key role in the synthesis of Mn-doped MCs.…”

“…The concentration of Mn 2+ affects the optical properties of PMSCs and PQDs, with a higher concentration of Mn A similar preference of Mn 2+ doping in MCs was also reported, where no characteristic Mn 2+ d−d emission in the product was observed when MnBr 2 was used (Figure 9c). 67 The Mn 2+ precursor was suggested to play a key role in the synthesis of Mn-doped MCs. Mn 2+ doping only takes place at relatively high MnCl 2 concentration, and MnCl 2 seems to contribute to the incorporation of Mn 2+ .…”

Influence of Electrochemical Anticorrosion Technology on Concrete Structure and Performance

“…In further experiments, the arc resistance of L1 and L2 capacitances in the frequency range was the difference of 84 days, indicating that during this time, the effects of differential corrosion of carbon steel begins to appear slowly. e fluidity of the whole process of corrosion protection and the migration capacity of the corrosion protection material is very weak, so the control level of the whole process is diffusion capacity of corrosion protective equipment [19].…”

Synthesis and Properties of Stable Amino Metal Halide Molecular Clusters in the Solid State

“…They exhibit bluer absorption and emission bands compared with those of MHP NCs, , quantum dots (QDs), − or magic sized clusters (MSCs) − due to their smaller size, over the ranges of 335–515 nm for absorption peaks and 344–519 nm for photoluminescence (PL) peaks depending on the halides. Their ultrasmall size and sharp absorption and emission bands, with a full width at half-maximum (fwhm) around 10 nm, are attractive for potential photonics applications such as blue single-photon emitters. ,, …”

“…Their ultrasmall size and sharp absorption and emission bands, with a full width at half-maximum (fwhm) around 10 nm, are attractive for potential photonics applications such as blue single-photon emitters. 2,3,12 Earlier attempts have been made to determine the structure of the PbX 2 -BTYA MCs using the extended X-ray absorption fine structure (EXAFS) technique, and several tentative structural models were proposed. 2 However, it has been challenging to determine their structure directly using techniques such as X-ray diffraction (XRD) and transmission electron microscopy (TEM) because the MCs tend to grow into larger structures or aggregate upon drying into a solid form.…”