ZnO induced self-crystallization of CsPb(Br/I)3 nanocrystal glasses with improved stability for backlight display application

Abstract

• With further the integration of green-emitting CsPbBr3@glasses powder, a flexible film with white light-emitting were obtained by sandwiching and gluing mixed glasses powders between two layers of hydrophobic and transparent PET films. • A high-resolution backlight image is acquired by putting PET composite film into the backlight device. • The content of lead can hardly dissolve from ZnO induced self-crystallized CsPb(Br/I)3@glass, indicating its excellent environmental friendliness. • The maximum PLQY of the obtaining CsPb(Br/I)3@glass composite is of 30% with the content of ZnO was 13 mol%. • The FWHM (34–44 nm) can be well modified by tailoring the content of ZnO. • ZnO can not only be used as a flux to reduce the sintering temperature of glass, but also as a network modifier to make the glass structure more stable. • wLEDs are constructed and applied in backlit display, achieving a color gamut covering up 126% of NTSC and 93.4% of Rec. 2020. • The outstanding stability towards water, cyclic thermal and 455 nm LED irradiation benefit from the protection of the robust glass matrix. In the current situation of energy shortages, saving energy and reducing consumption are undoubtedly valid methods to relieve the pressure on resources. CsPb X 3 ( X = Cl, Br, and I) perovskites as star inorganic materials have drawn growing attention owing to their unique properties, making them suitable for applications such as light-emitting diodes (LEDs), solar cells, photodetectors, or lasers. This work presents zinc oxide (ZnO) induced self-crystallized CsPb(Br/I) 3 perovskite with a 26% photoluminescence quantum yield (PLQY) prepared by the traditional melt-quenching method. Furthermore, the full width at half maximum (FWHM) (34–44 nm) can be regulated by the ZnO content. In addition, as a downconverter, CsPb(Br/I) 3 perovskite nanocrystals (NCs) realize a bright red backlight that covers ≈ 94% Rec. 2020 standards in the CIE 1931 color space and 126% of National Television System Committee (NTSC). This finding undoubtedly confirms an effective path for fabricating perovskite materials in a green, low-cost, and time-saving way, enriching the knowledge of glass crystallization mechanisms and promoting their applications in wide color gamut backlights.