High Quantum Efficiency Zn<sup>2+</sup> Doped Lead Manganese Halide @PET Film Used for Wide Color Gamut Backlit Display
Fan Yang, Meiting Yang, Xiaoting Liu, Jiapeng Yang, Zhennan Wu, Xiaojuan Liang, Chunyan Lv, Weidong Xiang
Abstract
Abstract Organic–inorganic manganese halide with environmentally friendly properties has become a new candidate material for backlight display applications. In this article, tetraethylammonium bromide (C 8 H 20 N) 2 MnBr 4 is synthesized by a simple room temperature evaporation method. The tetrahedral coordinated Mn 2+ demonstrates a green emission peak at 523 nm and a commendable photoluminescence quantum yield (PLQY) of 81.7%. To improve its stability, different proportions of Zn 2+ are incorporated, leading to the discovery of (C 8 H 20 N) 2 Mn 0.95 Zn 0.05 Br 4 as the most stable variant with a high PLQY of 84.3%. Additionally, by utilizing a sandwich method and double‐layer polyethylene terephthalate (PET) film encapsulation, the powder‐to‐binder ratio and thickness gradient are optimized, resulting in the ideal (C 8 H 20 N) 2 Mn 0.95 Zn 0.05 Br 4 @PET film with a powder‐to‐binder ratio of 1:2 and a thickness of 0.5 mm. Remarkably, the film exhibits superior stability against water, heat, and photo degradation. Finally, the light conversion film prepared from (C 8 H 20 N) 2 Mn 0.95 Zn 0.05 Br 4 @K 2 SiF 6 : Mn 4+ @PET composite material is applied to backlight display, and the color gamut covers 112% of NTSC 1953 and 83% of Rec. 2020. This study provides a feasible route for developing environmentally friendly, low‐cost, and high‐performance liquid crystal displays.