Abstract
Metal oxides exhibit excellent barrier properties against moisture and oxygen, which are regarded as the powerful candidate for boosting the stability of perovskite nanocrystals (NCs). Here, we develop a simple method to coat perovskite NCs with PbO by peroxides post-treatment. Firstly, the didodecyl dimethyl ammonium sulfide (DDAS) was used to modify the CsPbBr3 NCs (DDAS-CsPbBr3), and then sequentially treated with benzoyl peroxide (BPO). By this way, the self-metal source (lead) can be easily oxidized, leading to the quick growth of lead oxide (PbO) on the surface of individual CsPbBr3 NCs. Under illumination with a 450 nm LED light (175mW/cm2), the PbO coated CsPbBr3 NCs maintained at approximately 90% of the initial intensity for 20 h of operations; in contrast, the emission from the CsPbBr3 NCs completely quenched.
Highlights
All inorganic cesium lead halide (CsPbX3, X = Cl, Br, and I) perovskite nanocrystals (NCs) are promising materials for optoelectronic applications (Zhang et al, 2018; Juang et al, 2019; Papagiorgis et al, 2019), especially for light emitting because of their optically tunable band gap and excellent photoluminescence quantum yields (PLQY)
benzoyl peroxide (BPO) toluene solution was directly added to a CsPbBr3 NCs solution using a syringe pump for oxidation
It was observed that there existed the aggregation of CsPbBr3 NCs after BPO treatment in the Figure 2, which indicated that ligands deriving from the CsPbBr3 NCs were peeled
Summary
In the field of QDs, oxidant-hydrogen peroxides have been using to improve the luminescent properties of quantum dots. Lee et al treated CdS QDs with hydrogen peroxide and formed CdSO4 on the surface of QDs, which increased the radiation recombination rate of CdS QDs and improved their luminous efficiency (Lee et al, 2012). Inspired by the fact that oxidants promote the formation of oxide protective films on metal surfaces, we treated CsPbBr3 NCs with oxidizing agents, which is expected to improve their stability. BPO has good solubility in toluene, and it can form a uniform system with CsPbBr3 NCs toluene solution, which is beneficial to the oxidation reaction. BPO is chosen here as an oxidant to treat CsPbBr3 NCs, and PbO is formed on the surface, which resists the corrosion of water vapor and oxygen, and endows the CsPbBr3 NCs with excellent phototability
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