Stable CsPbBr₃ Nanocrystals Embedded in SiO₂ for Backlight Display Applications

Abstract

As we all know, the various excellent properties of perovskite nanocrystals (NCs) have attracted attention in recent years. However, thei work stability is still the bottleneck to be solved urgently in their commercialization process. In this study, we encapsulated CsPbBr3 quantum dots in nano-SiO2 (inorganic) by a high-temperature sintering method and investigated the changes in optical stability before and after encapsulation. The SiO2 shell can effectively suppress anion exchange and photodegradation, which greatly improves the photothermal stability of shell NCs. Preparation of composite films by mixing CsPbBr3–SiO2 (inorganic) and polymer material PMMA (organic) by a solvent solution method can further enhance its stability. Meanwhile, the backlight display device realized the practical application of CsPbBr3–SiO2/CsPbBr1.2I1.8@PMMA with a wide color gamut (112% of the NTSC, 84% of the Rec. 2020). This is a very significant step to open up the awkward situation of the practical application of perovskite NC materials in backlight displays.

A high-performance metal halide perovskite-based laser-driven display

“…It is nearest to the NTSC 2020 (98%) (Table S2, ESI†). From Table S3 (ESI†), the color gamut space of the LD driven backlight panel is wider than that of the other reported works, 45–52 which is the highest one so far. Fig.…”

All-inorganic lead halide perovskites for photocatalysis: a review

“…Liang et al evaluated the difference in the optical stability before and aer encapsulating CsPbBr 3 in nano-SiO 2 . 222 These ndings indicate that the SiO 2 shell can signicantly increase the photothermal stability of the shell by successfully restraining anion exchange and photodegradation.…”

Stable and luminescent cesium copper halide nanocrystals embedded in flexible polymer fibers for fabrication of down-converting WLEDs

“…[45][46][47][48] Encapsulating CsPbX 3 NCs in a high bandgap SiO 2 shell improves the thermal stability of the NCs and also suppresses photo-degradation and anion exchange among the NCs. [49][50][51][52] Polymer polyvinyl-pyrrolidone (PVP) and nisopropyl acrylamide (NIPAM) coated around CsPbX 3 NCs exhibit better optical properties, higher heat stability, and improved resilience against highly polar solvents. 53,54 CsPbBr 3 NCs encapsulated in poly(methyl methacrylate) (PMMA) polymer nano-spheres reveal remarkable water stability for over 80 days.…”