Ultra-Stable and Bright Pure-Red Perovskite Nanocrystals for Backlit Displays

IF 8 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY
Yuze Zhang, Zhenwei Ren, Hengfei Shi, Zhiyong Zheng, Xin Zhou, Chengzhao Luo, Huifeng Ji, Hua Chen, Yanyan Wang, Yu Chen
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Abstract

Metal halide perovskite nanocrystals (NCs) have emerged as an alternative to conventional phosphors for wide color gamut displays. However, the issues of poor stability and low emission efficiency of pure-red CsPbBrxI3-x NCs set an obstacle to their practical application. Herein, the synergistic effect of Mn doping and mesoporous SiO2 sealing is reported through in situ formation of Mn-doped NCs into mesoporous SiO2 nanospheres (MnNCs@SiO2) to structurally and spatially stabilize the perovskite NCs for bright and stable pure-red emitter. The large bonding energy of Mn-halogen effectively suppresses the halide vacancy defects, prompting the highest photoluminescence quantum yield (PLQY) up to 84% (634 nm) among the pure-red composite analogs. More importantly, the nanocrystal structure stability is fundamentally improved by the enhanced formation energy with Mn doping, together with the spatial isolation by SiO2 nanospheres. The MnNCs@SiO2 films exhibit impressive stabilities against high-temperature heating, thermal cycle test, UV irradiation, water, and acid/alkali erosion, representing one of the most stable pure-red perovskite emitters. By integrating fabricated all-perovskite CsPbX3 single color conversion film into the liquid crystal display (LCD) modules, a wide color gamut of 128% of NTSC is achieved, enabling an excellent color rendition for high-saturation object colors toward practical applications.

Abstract Image

用于背光显示器的超稳定、亮度高的纯红色 Perovskite 纳米晶体
金属卤化物过氧化物纳米晶体(NCs)已成为广色域显示器中传统荧光粉的替代品。然而,纯红色 CsPbBrxI3-x NCs 的稳定性差、发射效率低等问题阻碍了它们的实际应用。本文通过在介孔二氧化硅纳米球(MnNCs@SiO2)中原位形成掺杂锰的NCs,报道了锰掺杂和介孔二氧化硅密封的协同效应,从而在结构上和空间上稳定了过氧化物NCs,使其成为明亮稳定的纯红色发光体。卤化锰的高键能有效抑制了卤化物空位缺陷,从而使纯红色复合类似物的光量子产率(PLQY)高达 84%(634 nm)。更重要的是,由于掺入锰后形成能增强,再加上 SiO2 纳米球的空间隔离,纳米晶体结构的稳定性得到了根本改善。MnNCs@SiO2 薄膜在高温加热、热循环测试、紫外线辐照、水和酸碱侵蚀等条件下都表现出令人印象深刻的稳定性,是最稳定的纯红色过氧化物发光体之一。通过将制备的全过氧化物 CsPbX3 单色转换薄膜集成到液晶显示器(LCD)模块中,实现了 128% 的 NTSC 宽色域,使高饱和度物体颜色的出色色彩呈现走向实际应用。
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来源期刊
Advanced Optical Materials
Advanced Optical Materials MATERIALS SCIENCE, MULTIDISCIPLINARY-OPTICS
CiteScore
13.70
自引率
6.70%
发文量
883
审稿时长
1.5 months
期刊介绍: Advanced Optical Materials, part of the esteemed Advanced portfolio, is a unique materials science journal concentrating on all facets of light-matter interactions. For over a decade, it has been the preferred optical materials journal for significant discoveries in photonics, plasmonics, metamaterials, and more. The Advanced portfolio from Wiley is a collection of globally respected, high-impact journals that disseminate the best science from established and emerging researchers, aiding them in fulfilling their mission and amplifying the reach of their scientific discoveries.
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