Zn-Doped Organic–Inorganic Hybrid Mn(II) Halides with Ultra-High PLQY and Stability for Eco-Friendly Display Backlights
Meiqing Yan, Jiapeng Yang, Enrou Mei, Ye He, Zhaoping Chen, Weiwei Huan, Xiaojuan Liang, Weidong Xiang
Abstract
To address the issues of Pb toxicity and stability in traditional lead halide perovskite materials, this study presented an environmentally benign aqueous-phase synthesis method for the fabrication of a series of high-performance, green-emitting, lead-free organic–inorganic hybrid manganese(II) halide (OIMnHs) materials, (C 12 H 28 N) 2 Mn (1– x ) Zn x Br 4 . Through Zn 2+ doping, the optical properties and stability of the materials were significantly enhanced. Notably, (C 12 H 28 N) 2 Mn 0.95 Zn 0.05 Br 4 exhibited a remarkable photoluminescence quantum yield (PLQY) of 97.2% and narrow-band green emission at 520 nm with a full width at half-maximum (fwhm) of 43 nm. Furthermore, (C 12 H 28 N) 2 Mn 0.95 Zn 0.05 Br 4 @PET composite films, fabricated via a double-layered PET film encapsulation technique, demonstrated exceptional environmental stability, including resistance to air, heat, water, and blue light. Finally, by integrating (C 12 H 28 N) 2 Mn 0.95 Zn 0.05 Br 4 with commercial K 2 SiF6:Mn 4+ red phosphor, a composite light conversion film was developed, achieving an impressive wide color gamut coverage of 116.73% NTSC 1953 and 86.82% Rec. 2020. Importantly, the aqueous-phase method exhibited excellent scalability, as demonstrated by a successful 20-fold scale-up production without compromising the optical properties or crystal structure of the materials, highlighting its potential for large-scale manufacturing. This study paved the way for the development of high-performance, environmentally friendly, low-cost, and readily scalable lead-free halide materials for wide-color-gamut backlight displays.