Fe²⁺ doped in CsPbCl₃ perovskite nanocrystals: impact on the luminescence and magnetic properties

Abstract

The CsPb1−xFexCl3 NCs were synthesized and an appropriate amount of Fe2+ doping can enhance PLQY and average PL lifetimes. Meanwhile, an obvious hysteresis behavior has been observed for the NCs.

State of the Art and Prospects for Halide Perovskite Nanocrystals

“…The degree of acidity and basicity of the ligands is also important for effective passivation, as the defects can have a varying degree of acidity or basicity. Over the years, a wide range of organic acids and amines ( e.g ., oleylamine/oleic acid, octylamine, phosphonic acids (PAs), APTES, l -cysteine, aniline/benzylamine, phenethylamine, and n -trioctylphosphine (TOP) have been tested as ligands for LHP NCs. ,,,,− For instance, in the case of CsPbI 3 , Cs + is considered as a weak acid, Pb 2+ a weak acid, as well, and I – a weak base, while in the case of MAPbBr 3 , MA + is a weak acid and Br – is a weak base (though stronger than I – ) . Based on the Pearson acid/base case concept, weak acid defects require weak base ligands, while weak base defects require weak acid ligand for optimal passivation .…”

“…For example, butylphosphonic acid 4-ammonium chloride with a combination of phosphate and amino functional groups can simultaneously passivate MA + , Pb 2+ , and I – defects . Additionally, suaraine, polyaniline, and quaternary ammonium salts have been shown to be good capping ligands for MAPbI 3 bulk, MAPbI 3 film, and MAPbBr 3 bulk, respectively. , Peptides containing both −NH 3 + – and −COO – – in one molecule have been used to passivate MA + , Pb 2+ , and Br – of MAPbBr 3 perovskite NCs . Similarly, trifunctional l -cysteine has been used to passivate MAPbBr 3 perovskite NCs and induced self-assembly of perovskite NCs, based on synergistic effects among −NH 3 + –, −COO – –, and −SH– groups .…”

Near‐Unity Quantum Yield and Superior Stable Indium‐Doped CsPbBrxI3−x Perovskite Quantum Dots for Pure Red Light‐Emitting Diodes

“…As shown in the XRD pattern spectra (Figure S9a,b, Supporting Information), Fe 3+ , Al 3+ , and Sb 3+ could also substitute Pb 2+ sites because of the smaller ionic radii of Fe 3+ , Al 3+ , and Sb 3+ ions relative to Pb 2+ ions. [53][54][55][56][57][58] However, the measured PLQYs of Al 3+ -10%, Fe 3+ -10%, and Sb 3+ -10% PeQDs under the same experimental conditions are 37.96%, 35.26%, and 85.18%, respectively, which are obviously lower than that of 10% In 3+ -doped CsPbBr x I 3−x PeQDs (Figure S9c,d, Supporting Information). The stability of M 3+ (M 3+ = Fe 3+ , Al 3+ , and Sb 3+ )-doped CsPbBr x I 3−x PeQDs in n-hexane only remains for ≈10 days in atmosphere.…”

An effective Fe(ii) doping strategy for stable and highly photoluminescent CsPbBrI2 nanocrystals

“…As two stable oxidation states of iron, Fe 2+ and Fe 3+ have recently been doped in CsPbCl 3 NCs. [35][36][37] Hu et al prepared Fe 2+ doped CsPbCl 3 NCs, which exhibited the highest PLQY of 6.2%. 35 Shyamal et al doped Fe 2+ in CsPbBr 3 NCs for use as an efficient photocatalyst for the reduction of CO 2 .…”

“…[35][36][37] Hu et al prepared Fe 2+ doped CsPbCl 3 NCs, which exhibited the highest PLQY of 6.2%. 35 Shyamal et al doped Fe 2+ in CsPbBr 3 NCs for use as an efficient photocatalyst for the reduction of CO 2 . 36 Singh et al reported Fe 3+ doped CsPbCl 3 , which improved the PLQY from 1.85% to 4.32%.…”