The pursuit of stable and highly emissive perovskite materials has garnered increasing attention in optoelectronic applications. Green-emitting CsPbBr₃@Cs₄PbBr₆, as a green-emissive material in the solid-state form, has great potential as a color conversion material for full-color displays. However, it is a challenge to achieve mass preparation under ambient conditions. Meanwhile, the formation mechanism is ambiguous. This study reports a ligand-free and rapid mass synthesis of nanomicrosized CsPbBr₃@Cs₄PbBr₆ solid via an ultrasonic-assisted method. The synthesized CsPbBr₃@Cs₄PbBr₆ solids exhibit uniform morphology, high stability, and solid-state quantum efficiency of approximately 55%. Moreover, the transformation mechanism from Pb–Br complexes in the synthesis process is fully investigated by monitoring the phase and spectral evolution. By employing it as a green emitter, the obtained white light-emitting diode (LED) device shows high performance with a correlation color temperature of 7635 K and a wide color gamut of 123% NTSC. This study offers a low-cost and simple operation mass production method for solid-state perovskite powders with excellent chemical stability. Additionally, it provides new insights into the formation mechanism of highly efficient perovskite materials and promotes their practical applications.

中文翻译：

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揭示超声辅助合成绿光发光CsPbBr3@Cs4PbBr6：反应过程、发光特性和显示应用


对稳定和高发射钙钛矿材料的追求在光电应用中引起了越来越多的关注。发光绿光的 CsPbBr₃@Cs₄PbBr₆ 作为固态形式的绿光发光材料，作为全彩显示器的颜色转换材料具有巨大潜力。然而，在环境条件下实现大规模制备是一项挑战。同时，形成机制不明确。本研究报道了通过超声辅助方法无配体快速合成纳米微米级 CsPbBr₃@Cs₄PbBr₆ 固体的方法。合成的 CsPbBr₃@Cs₄PbBr₆ 固体表现出均匀的形态、高稳定性和约 55% 的固态量子效率。此外，通过监测相和谱演变，充分研究了 Pb-Br 配合物在合成过程中的转化机制。通过将其用作绿色发射器，获得的白光发光二极管 （LED） 器件显示出高性能，具有 7635 K 的相关色温和 123% NTSC 的宽色域。本研究提供了一种低成本、操作简单的固态钙钛矿粉末批量生产方法，具有优异的化学稳定性。此外，它为高效钙钛矿材料的形成机制提供了新的见解，并促进了它们的实际应用。