Topology Engineering of Red Perovskite Quantum Dots Glasses: A Path to Display with Rec.2020 Standard

Abstract

Perovskite quantum dots (PeQDs) glasses with super stability and excellent optical properties have become one of the hot candidates as color-converting materials for wide-color-gamut displays. However, it is a great challenge to simultaneously tune luminescent wavelength and photoluminescent quantum yield (PLQY) for red-emitting halogen-mixed CsPb(Br/I)₃ in inorganic glass matrix to completely fulfill Rec.2020 display standard. Herein, topology engineering of borosilicate glass network via controlling B₂O₃ content is demonstrated to be an effective strategy to address the issue for the first time. Molecular dynamics (MD) simulation, structural and spectroscopic characterizations evidence that appropriate B₂O₃ content enables the transition of glass network structure from 3D to 2D, which promotes I⁻ diffusion and in situ growth of high-quality CsPb(Br/I)₃ PeQDs in glass. As a result, the as-prepared CsPb(Br/I)₃@glass shows a record PLQY up to 91% with an ideal emitting wavelength of 645 nm and provides excellent visual effects for the constructed PeQDs-converted backlit display. This finding fills a gap in wavelength and efficiency modulation for halogen-mixed PeQDs glasses and paves the way to implement the Rec.2020 display standard.