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 B 2 O 3 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 B 2 O 3 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.