Mesoporous Silica Particles Integrated with All‐Inorganic CsPbBr₃ Perovskite Quantum‐Dot Nanocomposites (MP‐PQDs) with High Stability and Wide Color Gamut Used for Backlight Display

Abstract

All‐inorganic CsPbX3 (X=I, Br, Cl) perovskite quantum dots (PQDs) have been investigated because of their optical properties, such as tunable wavelength, narrow band, and high quantum efficiency. These features have been used in light emitting diode (LED) devices. LED on‐chip fabrication uses mixed green and red quantum dots with silicone gel. However, the ion‐exchange effect widens the narrow emission spectrum. Quantum dots cannot be mixed because of anion exchange. We address this issue with a mesoporous PQD nanocomposite that can prevent ion exchange and increase stability. We mixed green quantum‐dot‐containing mesoporous silica nanocomposites with red PQDs, which can prevent the anion‐exchange effect and increase thermal and photo stability. We applied the new PQD‐based LEDs for backlight displays. We also used PQDs in an on‐chip LED device. Our white LED device for backlight display passed through a color filter with an NTSC value of 113 % and Rec. 2020 of 85 %.

Encapsulation of Perovskite Nanocrystals into Macroscale Polymer Matrices: Enhanced Stability and Polarization

“…In recent years, metal halide perovskites (e.g., methylammonium lead bromide (CH 3 NH 3 PbBr 3 ) and cesium lead bromide (CsPbBr 3 )) have been in the spotlight as highly promising optical device materials. 1−3 These materials display high quantum yields and long lifetimes which result in highly efficient backlight displays 4 and photodetectors. 5,6 However, their poor stability, due to their ionic nature and low melting temperatures, and environmental impact, from lead toxicity, 7 have raised major concerns over their large-scale applicability.…”

Efficient and Stable CsPb(Br/I)3@Anthracene Composites for White Light-Emitting Devices

“…23 Some groups avoided anion-exchange reaction by constructing a silica shell or synthesizing CsPbX 3 /zeolite-Y composite phosphors. 8,16,24,25, In these studies, although the anion-exchange reaction was restrained, the multistep synthesis and long-time treatment were normally needed. Additionally, the white light emissions were achieved by mixing a multilayer of green and red perovskite phosphors with blue InGaN chips, which suffered from the low color rendering index (CRI) and high correlated color temperature (CCT) that varied with working voltage and phosphor coating thickness.…”

Silver nanoparticles enhanced luminescence and stability of CsPbBr3 perovskite quantum dots in borosilicate glass

“…At present, many researchers devote to solve problem that the stability of the quantum dots. R Liu et al used a nonpolar solvent to prevent the solvent effect of the polymer and synthesized mesoporous silica‐perovskite quantum dots nanocomposites . This method can effectively prevent the anion exchange effect and improve thermal stability and light stability.…”