Organic polystyrene and inorganic silica double shell protected lead halide perovskite nanocrystals with high emission efficiency and superior stability

Improving the stability of perovskite nanocrystals via SiO2 coating and their applications

“…Hence, it is reasonable to envisage the combination of SiO 2 coating with other embedding methods to enhance the stability of perovskite QDs. [57][58][59] In 2019, Chen et al reported a dual protection strategy to embed perovskite QDs in double hydrophobic shells of alkyl-functionalized SiO 2 and hydrophobic poly(vinylidene uoride) (PVDF) to improve the stability of perovskite QDs (Fig. 4a).…”

Ligand Strategy for Perovskite Displays: A Review

“…This can be attributed to the fact that ligands with different functional groups can passivate different sites (A-, B-, or X- site), as shown in Figure (c), which illustrates some typical ligands for different sites. Compared with the inorganic or organic polymer shell, these ligands will not completely insulate the perovskites. − The ligand strategies will not face the risk of structural instability and unexpected energy band caused by component engineering. , In addition, ligand strategy can not only reduce the energy loss or ion migration but also improve the luminescent property, device lifetime, and color purity of the display devices. Therefore, these methods necessitate timely attention and summarization, especially for high-performance perovskite displays (Pe-displays).…”

Boosting Stability and Inkjet Printability of Pure-Red CsPb(Br/I)3 Quantum Dots through Dual-Shell Encapsulation for Micro-LED Displays

“…The synthesis of the core−shell structure mentioned above is similar to our previous work. 22 However, in this case, the CsPb(Br/I) 3 QDs were synthesized by hot-injection, and the SiO 2 shell was synthesized using different combinations of silanes. This highlights the significance of silane selection and its universal applicability in synthesizing such core−shell structures with various QDs.…”

“…These findings are consistent with previous reports and demonstrate the attachment of a substantial number of SiO 2 and PS chains to the QDs. 22,47,49 Figure 2c presents the UV−vis absorption and PL spectra of the CsPb(Br/I) 3 , CsPb(Br/I) 3 @SiO 2 , and CsPb(Br/I) 3 @ SiO 2 @PS QDs. The absorption peaks are observed at 611, 612, and 612 nm, while the PL peaks are observed at 633, 628, and 627 nm, respectively.…”

“…These include increasing the energy barrier for halide segregation through A/B site cation alloying, modifying the surface to remove or immobilize surface defects, and coating the material to create core–shell structures. − Among these strategies, the core–shell structure has proven to be an effective strategy for improving the stability and luminescence properties of QDs, which have attracted much attention. However, the current study has limitations, including challenges with nonwaterproof/nondense inorganic coatings and issues with the dispersion of QDs in polymer-tethered composites. − It is important to consider the delicate balance between the easy agglomeration of the dense coating and the dispersion of the QDs in solution for fine and miniaturized applications.…”