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Facile low-temperature solid-state synthesis of efficient blue-emitting Cs3Cu2I5 powder phosphors for solid-state lighting
Materials Today Chemistry ( IF 7.3 ) Pub Date : 2020-09-01 , DOI: 10.1016/j.mtchem.2020.100288
Xiaoyong Huang , Qi Sun , Balaji Devakumar

Abstract The discovery of new environmentally friendly luminescent materials with high photoluminescence quantum yield and long-term stability is critical for future solid-state lighting and displays applications. Although lead halide perovskite materials with excellent optical properties have been extensively investigated in recent years because they hold tremendous promise in optoelectronic devices, the toxicity of lead and poor air-stability still hinder their commercial applications. Moreover, while substantial work has been done on three-dimensional (3D) perovskite halides, the zero-dimensional (0D) halide emitters with bright luminescence remain elusive. Herein we report a facile solid-state reaction method to prepare an efficient lead-free all-inorganic halide material with 0D structure, Cs3Cu2I5, with photoluminescence quantum yield up to 80%. Under ultraviolet excitation at 313 nm, the Cs3Cu2I5 powder phosphors show a strong blue photoluminescence emission with peak at 445 nm and CIE color coordinates of (0.1486, 0.0873). Notably, Cs3Cu2I5 exhibits good color stability at high temperatures and outstanding stability towards air exposure exceeding one month (30 days). These findings not only open up a door for the development of promising highly emissive low-dimensional halide materials for lighting and displays, but also offer a new scalable approach for the potential mass production of halide emitters.

中文翻译:

用于固态照明的高效蓝光 Cs3Cu2I5 粉末荧光粉的简便低温固态合成

摘要 发现具有高光致发光量子产率和长期稳定性的新型环保发光材料对于未来的固态照明和显示应用至关重要。尽管近年来由于具有优异光学性能的卤化铅钙钛矿材料在光电器件中具有巨大的应用前景而得到了广泛的研究,但铅的毒性和较差的空气稳定性仍然阻碍了它们的商业应用。此外,虽然已经对三维 (3D) 钙钛矿卤化物进行了大量工作,但具有明亮发光的零维 (0D) 卤化物发射器仍然难以捉摸。在此,我们报告了一种简便的固态反应方法来制备具有 0D 结构的高效无铅全无机卤化物材料 Cs3Cu2I5,光致发光量子产率高达80%。在 313 nm 的紫外激发下,Cs3Cu2I5 粉末荧光粉显示出强烈的蓝色光致发光发射,峰值在 445 nm,CIE 色坐标为 (0.1486, 0.0873)。值得注意的是,Cs3Cu2I5 在高温下表现出良好的颜色稳定性和对空气暴露超过 1 个月(30 天)的出色稳定性。这些发现不仅为开发用于照明和显示器的有前途的高发射低维卤化物材料打开了一扇门,而且还为卤化物发射器的潜在大规模生产提供了一种新的可扩展方法。Cs3Cu2I5 在高温下表现出良好的颜色稳定性,并且对超过 1 个月(30 天)的空气暴露具有出色的稳定性。这些发现不仅为开发用于照明和显示器的有前途的高发射低维卤化物材料打开了一扇门,而且还为卤化物发射器的潜在大规模生产提供了一种新的可扩展方法。Cs3Cu2I5 在高温下表现出良好的颜色稳定性,并且对超过 1 个月(30 天)的空气暴露具有出色的稳定性。这些发现不仅为开发用于照明和显示器的有前途的高发射低维卤化物材料打开了一扇门,而且还为卤化物发射器的潜在大规模生产提供了一种新的可扩展方法。
更新日期:2020-09-01
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