In Situ Growth of High-Quality CsPbBr₃ Quantum Dots with Unusual Morphology inside a Transparent Glass with a Heterogeneous Crystallization Environment for Wide Gamut Displays

Abstract

All-inorganic CsPbBr3 perovskite quantum dots (QDs) are considered to be one of the most promising green candidates for the new-generation backlight displays. The pending barriers to their applications, however, lie in their mismatching of the target window of green light, scalable production, susceptibility to the leaching of lead ions, and instability in harsh environments (such as moisture, light, and heat). Herein, high-quality CsPbBr3 QDs with globoid shapes and cuboid shapes were in situ crystallized/grown inside a well-designed glass to produce nanocomposites with peak emission at 526 nm, which not only exhibited photoluminescence quantum yields of 53 and 86% upon 455 and 365 nm excitation, respectively, but also have been imparted of high stability when they were submerged in water and exposed to heat and light. These characteristics, along with their lead self-sequestration capability and easy-to-scale preparation, can enable breakthrough applications for CsPbBr3 QDs in the field of wide color gamut backlit display. A high-performance backlight white LEDs was fabricated using the CsPbBr3 QDs@glass powder and K2SiF6:Mn4+ red phosphor, which shows a color gamut of ∼126% of the NTSC or 94% of the Rec. 2020 standards.

Efficient and Stable Perovskite White Light‐Emitting Diodes for Backlit Display

“…To date, all-inorganic CsPbX 3 (X = Cl, Br, and I) perovskite QDs (PeQDs) have been successfully precipitated in a variety of glasses via in situ nucleation/growth. [32][33][34][35][36][37][38][39] However, unlike wet-chemical synthesis, the dense glass network structure will hinder the diffusion of Cs + , Pb 2+ , and X − ions, and impede CsPbX 3 nanocrystallization inside glass, which makes PLQYs of CsPbX 3 @glass lower than those of colloidal counterparts. Herein, we have successfully optimized SiO 2 -B 2 O 3 -ZnO-CaF 2 glass network, perovskite component concentrations, and glass crystallization conditions to fabricate high-quality CsPbX 3 @glass.…”

CsPbX3 (X = Cl, Br, and I) Nanocrystals in Substrates toward Stable Photoluminescence: Nanoarchitectonics, Properties, and Applications

“…Based on the data provided by Li et al as shown in Figure , a gradual drop in PL intensity and slightly blue-shifted PL peak were observed as the temperature increased (Figure a and b), which is due to the thermal expansion of the perovskite nanocrystals and the electron–phonon interactions that lead to an increase in the band gap. , Further examinations of the photostability of the composites under continuous irradiation and ambient conditions were also carried out by Li and co-workers. And it was demonstrated that these CsPbBr 3 NCs@glass composites showed quite high stability for a 365-day test under ambient conditions (Figure f) and maintained 71.42 and 68.29% of the initial PL intensity in the case of 186 h of continuous irradiation under UV or blue lamp irradiation (Figure d and e) . Li et al also tested their CsPbBr 3 NCs@glass composites on backlight display applications.…”

“…(g, h) Application of white LED strips constructed utilizing the YAG:Ce 3+ (YAG) (commercial) and CsPbBr 3 NCs@glass backlight units in an LCD screen. All panels are reproduced from ref . Copyright 2022 American Chemical Society.…”

Ag Nanoparticles Optimized the Optical Properties and Stability of CsPbBrI2 Glass for High Quality Backlight Display

“…As the display industry continues to evolve, the market puts forward higher requirements on the performance of display devices. − All inorganic perovskite CsPbX 3 (X = Cl, Br, I) nanocrystal (NC) materials exhibit distinguished optical properties, including high carrier mobility, size-tunable emission, narrow full width at half-maximum (fwhm), − and high photoluminescence quantum yield (PLQY). , Over the past few years, they have been consistently identified as emerging frontiers, particularly in the area of backlight display applications, − generating significant interest among researchers. However, the instability of perovskite quantum dots (QDs), particularly their sensitivity to environmental conditions such as water, heat, light, and oxygen, significantly hinders their potential applications. − To keep pace with industrial development, it is imperative to optimize the performance and stability of perovskite QDs.…”