ZnO induced self-crystallization of CsPb(Br/I)3 nanocrystal glasses with improved stability for backlight display application. (10th September 2022)

• Record Type: Journal Article
• Authors: Wang, Qin; Tong, Yao; Yang, Meiting; Ye, Hangtao; Liang, Xiaojuan; Wang, Xin; Xiang, Weidong
• Is Part Of: Journal of materials science & technology. Volume 121(2022)
• Page Start: 140
• Page End: 147
• Publication Date: 2022-09-10
• Subjects: Perovskite glass -- Self-crystallization -- Backlight display; Metals -- Periodicals; Materials science -- Periodicals; Materials science; Metals; Periodicals; 620.1105
• DOI: 10.1016/j.jmst.2021.12.060
• Languages: English
• ISSNs: 1005-0302

Abstract

Highlights: 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. Abstract: 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. Graphical abstract: Image, graphical abstract